CVE-2025-37741 (GCVE-0-2025-37741)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:55 – Updated: 2026-08-05 11:57
VLAI
Title
jfs: Prevent copying of nlink with value 0 from disk inode
Summary
In the Linux kernel, the following vulnerability has been resolved: jfs: Prevent copying of nlink with value 0 from disk inode syzbot report a deadlock in diFree. [1] When calling "ioctl$LOOP_SET_STATUS64", the offset value passed in is 4, which does not match the mounted loop device, causing the mapping of the mounted loop device to be invalidated. When creating the directory and creating the inode of iag in diReadSpecial(), read the page of fixed disk inode (AIT) in raw mode in read_metapage(), the metapage data it returns is corrupted, which causes the nlink value of 0 to be assigned to the iag inode when executing copy_from_dinode(), which ultimately causes a deadlock when entering diFree(). To avoid this, first check the nlink value of dinode before setting iag inode. [1] WARNING: possible recursive locking detected 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Not tainted -------------------------------------------- syz-executor301/5309 is trying to acquire lock: ffff888044548920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 but task is already holding lock: ffff888044548920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(imap->im_aglock[index])); lock(&(imap->im_aglock[index])); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz-executor301/5309: #0: ffff8880422a4420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff88804755b390 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline] #1: ffff88804755b390 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:4026 #2: ffff888044548920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630 #3: ffff888044548890 (&imap->im_freelock){+.+.}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2460 [inline] #3: ffff888044548890 (&imap->im_freelock){+.+.}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] #3: ffff888044548890 (&imap->im_freelock){+.+.}-{3:3}, at: diAllocAG+0x4b7/0x1e50 fs/jfs/jfs_imap.c:1669 #4: ffff88804755a618 (&jfs_ip->rdwrlock/1){++++}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2477 [inline] #4: ffff88804755a618 (&jfs_ip->rdwrlock/1){++++}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] #4: ffff88804755a618 (&jfs_ip->rdwrlock/1){++++}-{3:3}, at: diAllocAG+0x869/0x1e50 fs/jfs/jfs_imap.c:1669 stack backtrace: CPU: 0 UID: 0 PID: 5309 Comm: syz-executor301 Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037 check_deadlock kernel/locking/lockdep.c:3089 [inline] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156 evict+0x4e8/0x9b0 fs/inode.c:725 diFreeSpecial fs/jfs/jfs_imap.c:552 [inline] duplicateIXtree+0x3c6/0x550 fs/jfs/jfs_imap.c:3022 diNewIAG fs/jfs/jfs_imap.c:2597 [inline] diAllocExt fs/jfs/jfs_imap.c:1905 [inline] diAllocAG+0x17dc/0x1e50 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590 ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x1c5/0xba0 fs/jfs/namei.c:225 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat+0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293 do_syscall_x64 arch/x86/en ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5b2f26d3fba4e9aac314f8bc0963b3fc28c0e456 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8b5ce75f8bd3ddf480cc0a240d7ff5cdea0444f9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 86bfeaa18f9e4615b97f2d613e0fcc4ced196527 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c9541c2bd0edbdbc5c1148a84d3b48dc8d1b8af2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b3c4884b987e5d8d0ec061a4d52653c4f4b9c37e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aeb926e605f97857504bdf748f575e40617e2ef9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 994787341358816d91b2fded288ecb7f129f2b27 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a2b560815528ae8e266fca6038bb5585d13aaef4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b61e69bb1c049cf507e3c654fa3dc1568231bd07 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.293 , ≤ 5.4.* (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.24 , ≤ 6.12.* (semver)
Unaffected: 6.13.12 , ≤ 6.13.* (semver)
Unaffected: 6.14.3 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: Prevent copying of nlink with value 0 from disk inode\n\nsyzbot report a deadlock in diFree. [1]\n\nWhen calling \"ioctl$LOOP_SET_STATUS64\", the offset value passed in is 4,\nwhich does not match the mounted loop device, causing the mapping of the\nmounted loop device to be invalidated.\n\nWhen creating the directory and creating the inode of iag in diReadSpecial(),\nread the page of fixed disk inode (AIT) in raw mode in read_metapage(), the\nmetapage data it returns is corrupted, which causes the nlink value of 0 to be\nassigned to the iag inode when executing copy_from_dinode(), which ultimately\ncauses a deadlock when entering diFree().\n\nTo avoid this, first check the nlink value of dinode before setting iag inode.\n\n[1]\nWARNING: possible recursive locking detected\n6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Not tainted\n--------------------------------------------\nsyz-executor301/5309 is trying to acquire lock:\nffff888044548920 (\u0026(imap-\u003eim_aglock[index])){+.+.}-{3:3}, at: diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889\n\nbut task is already holding lock:\nffff888044548920 (\u0026(imap-\u003eim_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n       CPU0\n       ----\n  lock(\u0026(imap-\u003eim_aglock[index]));\n  lock(\u0026(imap-\u003eim_aglock[index]));\n\n *** DEADLOCK ***\n\n May be due to missing lock nesting notation\n\n5 locks held by syz-executor301/5309:\n #0: ffff8880422a4420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515\n #1: ffff88804755b390 (\u0026type-\u003ei_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline]\n #1: ffff88804755b390 (\u0026type-\u003ei_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:4026\n #2: ffff888044548920 (\u0026(imap-\u003eim_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630\n #3: ffff888044548890 (\u0026imap-\u003eim_freelock){+.+.}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2460 [inline]\n #3: ffff888044548890 (\u0026imap-\u003eim_freelock){+.+.}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]\n #3: ffff888044548890 (\u0026imap-\u003eim_freelock){+.+.}-{3:3}, at: diAllocAG+0x4b7/0x1e50 fs/jfs/jfs_imap.c:1669\n #4: ffff88804755a618 (\u0026jfs_ip-\u003erdwrlock/1){++++}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2477 [inline]\n #4: ffff88804755a618 (\u0026jfs_ip-\u003erdwrlock/1){++++}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]\n #4: ffff88804755a618 (\u0026jfs_ip-\u003erdwrlock/1){++++}-{3:3}, at: diAllocAG+0x869/0x1e50 fs/jfs/jfs_imap.c:1669\n\nstack backtrace:\nCPU: 0 UID: 0 PID: 5309 Comm: syz-executor301 Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037\n check_deadlock kernel/locking/lockdep.c:3089 [inline]\n validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891\n __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202\n lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825\n __mutex_lock_common kernel/locking/mutex.c:608 [inline]\n __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\n diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889\n jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156\n evict+0x4e8/0x9b0 fs/inode.c:725\n diFreeSpecial fs/jfs/jfs_imap.c:552 [inline]\n duplicateIXtree+0x3c6/0x550 fs/jfs/jfs_imap.c:3022\n diNewIAG fs/jfs/jfs_imap.c:2597 [inline]\n diAllocExt fs/jfs/jfs_imap.c:1905 [inline]\n diAllocAG+0x17dc/0x1e50 fs/jfs/jfs_imap.c:1669\n diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590\n ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56\n jfs_mkdir+0x1c5/0xba0 fs/jfs/namei.c:225\n vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257\n do_mkdirat+0x264/0x3a0 fs/namei.c:4280\n __do_sys_mkdirat fs/namei.c:4295 [inline]\n __se_sys_mkdirat fs/namei.c:4293 [inline]\n __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293\n do_syscall_x64 arch/x86/en\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - JFS is a local block-device filesystem with no network-facing path; the attack requires presenting a crafted image locally (loop/removable media/untrusted disk image) and then issuing ordinary local syscalls such as mkdir(2). No remote or adjacent reachability exists.\nAC:L - The attacker fully controls the on-disk di_nlink and di_fileset fields in the aggregate inode table, so the corrupted inode is produced deterministically; the deadlock and the diFree()-on-metadata-inode path follow with no race or memory-layout condition outside attacker control.\nPR:L - An unprivileged local user is sufficient in common deployments \u2014 udisks2 auto-mounts attacker-supplied removable media for a desktop session, and the trigger itself (jfs_mkdir \u2192 diAlloc \u2192 diNewIAG \u2192 duplicateIXtree \u2192 diReadSpecial) passes no capability check. JFS lacks FS_USERNS_MOUNT, so mounting is not free, but it does not require real root in the init namespace in these scenarios.\nUI:N - Once the attacker can present the image (their own loop mount, inserted media auto-mounted for them, or a disk image handed to a host), they complete the attack alone with a plain mkdir; no separate victim action is needed.\nS:U - The corruption and the hang are confined to the kernel\u0027s own security authority \u2014 filesystem metadata, imap structures, and kernel locks. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unvalidated nlink==0 causes an in-use aggregate metadata inode to be prematurely evicted and destroyed while metapages and transaction tlocks still reference it, and lets diFree() free a metadata inode number so it can later be re-handed out as a regular file aliasing the fixed inode table \u2014 a use-after-free/aliasing primitive leveragable to read kernel and on-disk metadata.\nI:H - diFree() on a metadata inode rewrites iagp-\u003ewmap[], imap-\u003eim_agctl[].inofree/numfree and the IAG free-list linkage and commits the corruption via write_metapage(); subsequent diAllocIno/diAllocAG then follow attacker-influenced IAG indices, giving arbitrary metadata modification on top of the freed-object write reach.\nA:H - The reported and reproduced impact is a recursive mutex_lock on imap-\u003eim_aglock \u2014 a permanent, unkillable deadlock with sb_writers, the directory i_rwsem, im_freelock and rdwrlock held \u2014 wedging the entire mount and blocking umount/freeze/sync, with hung-task panic on systems configured for it."
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        {
          "url": "https://git.kernel.org/stable/c/5b2f26d3fba4e9aac314f8bc0963b3fc28c0e456"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b5ce75f8bd3ddf480cc0a240d7ff5cdea0444f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/86bfeaa18f9e4615b97f2d613e0fcc4ced196527"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9541c2bd0edbdbc5c1148a84d3b48dc8d1b8af2"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3c4884b987e5d8d0ec061a4d52653c4f4b9c37e"
        },
        {
          "url": "https://git.kernel.org/stable/c/aeb926e605f97857504bdf748f575e40617e2ef9"
        },
        {
          "url": "https://git.kernel.org/stable/c/994787341358816d91b2fded288ecb7f129f2b27"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2b560815528ae8e266fca6038bb5585d13aaef4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b61e69bb1c049cf507e3c654fa3dc1568231bd07"
        }
      ],
      "title": "jfs: Prevent copying of nlink with value 0 from disk inode",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37741",
    "datePublished": "2025-05-01T12:55:49.947Z",
    "dateReserved": "2025-04-16T04:51:23.936Z",
    "dateUpdated": "2026-08-05T11:57:12.701Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-37741",
      "date": "2026-08-05",
      "epss": "0.00152",
      "percentile": "0.04901"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T14:20:03.000Z",
      "cve": "CVE-2025-37741",
      "id": "msrc_CVE-2025-37741",
      "initial_release_date": "2025-05-02T00:00:00.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "jfs: Prevent copying of nlink with value 0 from disk inode",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-37741.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37741\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:52.723\",\"lastModified\":\"2026-07-30T06:22:18.423\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\njfs: Prevent copying of nlink with value 0 from disk inode\\n\\nsyzbot report a deadlock in diFree. [1]\\n\\nWhen calling \\\"ioctl$LOOP_SET_STATUS64\\\", the offset value passed in is 4,\\nwhich does not match the mounted loop device, causing the mapping of the\\nmounted loop device to be invalidated.\\n\\nWhen creating the directory and creating the inode of iag in diReadSpecial(),\\nread the page of fixed disk inode (AIT) in raw mode in read_metapage(), the\\nmetapage data it returns is corrupted, which causes the nlink value of 0 to be\\nassigned to the iag inode when executing copy_from_dinode(), which ultimately\\ncauses a deadlock when entering diFree().\\n\\nTo avoid this, first check the nlink value of dinode before setting iag inode.\\n\\n[1]\\nWARNING: possible recursive locking detected\\n6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Not tainted\\n--------------------------------------------\\nsyz-executor301/5309 is trying to acquire lock:\\nffff888044548920 (\u0026(imap-\u003eim_aglock[index])){+.+.}-{3:3}, at: diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889\\n\\nbut task is already holding lock:\\nffff888044548920 (\u0026(imap-\u003eim_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630\\n\\nother info that might help us debug this:\\n Possible unsafe locking scenario:\\n\\n       CPU0\\n       ----\\n  lock(\u0026(imap-\u003eim_aglock[index]));\\n  lock(\u0026(imap-\u003eim_aglock[index]));\\n\\n *** DEADLOCK ***\\n\\n May be due to missing lock nesting notation\\n\\n5 locks held by syz-executor301/5309:\\n #0: ffff8880422a4420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515\\n #1: ffff88804755b390 (\u0026type-\u003ei_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline]\\n #1: ffff88804755b390 (\u0026type-\u003ei_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:4026\\n #2: ffff888044548920 (\u0026(imap-\u003eim_aglock[index])){+.+.}-{3:3}, at: diAlloc+0x1b6/0x1630\\n #3: ffff888044548890 (\u0026imap-\u003eim_freelock){+.+.}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2460 [inline]\\n #3: ffff888044548890 (\u0026imap-\u003eim_freelock){+.+.}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]\\n #3: ffff888044548890 (\u0026imap-\u003eim_freelock){+.+.}-{3:3}, at: diAllocAG+0x4b7/0x1e50 fs/jfs/jfs_imap.c:1669\\n #4: ffff88804755a618 (\u0026jfs_ip-\u003erdwrlock/1){++++}-{3:3}, at: diNewIAG fs/jfs/jfs_imap.c:2477 [inline]\\n #4: ffff88804755a618 (\u0026jfs_ip-\u003erdwrlock/1){++++}-{3:3}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]\\n #4: ffff88804755a618 (\u0026jfs_ip-\u003erdwrlock/1){++++}-{3:3}, at: diAllocAG+0x869/0x1e50 fs/jfs/jfs_imap.c:1669\\n\\nstack backtrace:\\nCPU: 0 UID: 0 PID: 5309 Comm: syz-executor301 Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:94 [inline]\\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\\n print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037\\n check_deadlock kernel/locking/lockdep.c:3089 [inline]\\n validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891\\n __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202\\n lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825\\n __mutex_lock_common kernel/locking/mutex.c:608 [inline]\\n __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\\n diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889\\n jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156\\n evict+0x4e8/0x9b0 fs/inode.c:725\\n diFreeSpecial fs/jfs/jfs_imap.c:552 [inline]\\n duplicateIXtree+0x3c6/0x550 fs/jfs/jfs_imap.c:3022\\n diNewIAG fs/jfs/jfs_imap.c:2597 [inline]\\n diAllocExt fs/jfs/jfs_imap.c:1905 [inline]\\n diAllocAG+0x17dc/0x1e50 fs/jfs/jfs_imap.c:1669\\n diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590\\n ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56\\n jfs_mkdir+0x1c5/0xba0 fs/jfs/namei.c:225\\n vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257\\n do_mkdirat+0x264/0x3a0 fs/namei.c:4280\\n __do_sys_mkdirat fs/namei.c:4295 [inline]\\n __se_sys_mkdirat fs/namei.c:4293 [inline]\\n __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293\\n do_syscall_x64 arch/x86/en\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: jfs: Impide la copia de nlink con valor 0 desde el inodo de disco. syzbot informa de un bloqueo en diFree. [1] Al llamar a \\\"ioctl$LOOP_SET_STATUS64\\\", el valor de desplazamiento pasado es 4, que no coincide con el dispositivo de bucle montado, lo que invalida la asignaci\u00f3n de dicho dispositivo. Al crear el directorio y el inodo de iag en diReadSpecial(), al leer la p\u00e1gina del inodo de disco fijo (AIT) en modo sin procesar en read_metapage(), los datos de metap\u00e1gina que devuelve est\u00e1n da\u00f1ados, lo que provoca que el valor nlink de 0 se asigne al inodo iag al ejecutar copy_from_dinode(), lo que finalmente provoca un bloqueo al acceder a diFree(). Para evitar esto, compruebe primero el valor nlink de dinode antes de configurar el inodo iag. [1] ADVERTENCIA: se detect\u00f3 un posible bloqueo recursivo 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 No contaminado -------------------------------------------- syz-executor301/5309 est\u00e1 intentando adquirir el bloqueo: ffff888044548920 (\u0026amp;(imap-\u0026gt;im_aglock[index])){+.+.}-{3:3}, en: diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 pero la tarea ya tiene el bloqueo: ffff888044548920 (\u0026amp;(imap-\u0026gt;im_aglock[index])){+.+.}-{3:3}, en: diAlloc+0x1b6/0x1630 Otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: Posible escenario de bloqueo inseguro: CPU0 ---- bloqueo(\u0026amp;(imap-\u0026gt;im_aglock[\u00edndice])); bloqueo(\u0026amp;(imap-\u0026gt;im_aglock[\u00edndice])); *** BLOQUEO INTERMEDIO *** Puede deberse a la falta de notaci\u00f3n de anidamiento de bloqueos. 5 bloqueos mantenidos por syz-executor301/5309: #0: ffff8880422a4420 (sb_writers#9){.+.+}-{0:0}, en: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff88804755b390 (\u0026amp;type-\u0026gt;i_mutex_dir_key#6/1){+.+.}-{3:3}, en: inode_lock_nested include/linux/fs.h:850 [en l\u00ednea] #1: ffff88804755b390 (\u0026amp;type-\u0026gt;i_mutex_dir_key#6/1){+.+.}-{3:3}, en: nombre_archivo_crear+0x260/0x540 fs/nombrei.c:4026 #2: ffff888044548920 (\u0026amp;(imap-\u0026gt;im_aglock[\u00edndice])){+.+.}-{3:3}, en: diAlloc+0x1b6/0x1630 #3: ffff888044548890 (\u0026amp;imap-\u0026gt;im_freelock){+.+.}-{3:3}, en: diNewIAG fs/jfs/jfs_imap.c:2460 [en l\u00ednea] #3: ffff888044548890 (\u0026amp;imap-\u0026gt;im_freelock){+.+.}-{3:3}, en: diAllocExt fs/jfs/jfs_imap.c:1905 [en l\u00ednea] #3: ffff888044548890 (\u0026amp;imap-\u0026gt;im_freelock){+.+.}-{3:3}, en: diAllocAG+0x4b7/0x1e50 fs/jfs/jfs_imap.c:1669 #4: ffff88804755a618 (\u0026amp;jfs_ip-\u0026gt;rdwrlock/1){++++}-{3:3}, en: diNewIAG fs/jfs/jfs_imap.c:2477 [en l\u00ednea] #4: ffff88804755a618 (\u0026amp;jfs_ip-\u0026gt;rdwrlock/1){++++}-{3:3}, en: diAllocExt fs/jfs/jfs_imap.c:1905 [en l\u00ednea] #4: ffff88804755a618 (\u0026amp;jfs_ip-\u0026gt;rdwrlock/1){++++}-{3:3}, en: diAllocAG+0x869/0x1e50 fs/jfs/jfs_imap.c:1669 seguimiento de pila: CPU: 0 UID: 0 PID: 5309 Comm: syz-executor301 No contaminado 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Nombre del hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 01/04/2014 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:94 [en l\u00ednea] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037 check_deadlock kernel/locking/lockdep.c:3089 [en l\u00ednea] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [en l\u00ednea] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156 evict+0x4e8/0x9b0 fs/inode.c:725 diFreeSpecial fs/jfs/jfs_imap.c:552 [en l\u00ednea] duplicateIXtree+0x3c6/0x550 fs/jfs/jfs_imap.c:3022 diNewIAG fs/jfs/jfs_imap.c:2597 [en l\u00ednea] diAllocExt fs/jfs/jfs_imap.c:1905 [en l\u00ednea] diAllocAG+0x17dc/0x1e50 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590 ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x1c5/0xba0 fs/jfs/namei.c:225 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat+0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [en l\u00ednea] __se_sys_mkdirat fs/namei.c:4293 [en \"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/jfs/jfs_imap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5b2f26d3fba4e9aac314f8bc0963b3fc28c0e456\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"8b5ce75f8bd3ddf480cc0a240d7ff5cdea0444f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"86bfeaa18f9e4615b97f2d613e0fcc4ced196527\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"c9541c2bd0edbdbc5c1148a84d3b48dc8d1b8af2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b3c4884b987e5d8d0ec061a4d52653c4f4b9c37e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"aeb926e605f97857504bdf748f575e40617e2ef9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"994787341358816d91b2fded288ecb7f129f2b27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"a2b560815528ae8e266fca6038bb5585d13aaef4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b61e69bb1c049cf507e3c654fa3dc1568231bd07\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/jfs/jfs_imap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.293\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.237\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.181\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.135\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.88\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.24\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.12\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.3\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.4.293\",\"matchCriteriaId\":\"389EB980-4648-446E-A0DC-5FB0265E0F02\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.237\",\"matchCriteriaId\":\"0710B81E-E2FA-4E15-8F68-D297EBB4D50D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.181\",\"matchCriteriaId\":\"12331C9E-F601-4EFC-899E-369F98DCC70B\"},{\"vulnerabl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List\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:36:58+00:00",
      "cve": "CVE-2025-37741",
      "id": "CVE-2025-37741",
      "initial_release_date": "2025-05-01T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: jfs: Prevent copying of nlink with value 0 from disk inode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37741.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-31T01:16:27Z",
      "cve": "CVE-2025-37741",
      "id": "CVE-2025-37741",
      "initial_release_date": "2025-05-02T02:03:11Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "370",
      "product_status:recommended": "354",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-37741",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-37741.json",
      "version": "40"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.