ghsa-8qr4-5p7h-w8mm
Vulnerability from github
Published
2024-10-21 12:30
Modified
2024-11-08 18:30
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

nfsd: return -EINVAL when namelen is 0

When we have a corrupted main.sqlite in /var/lib/nfs/nfsdcld/, it may result in namelen being 0, which will cause memdup_user() to return ZERO_SIZE_PTR. When we access the name.data that has been assigned the value of ZERO_SIZE_PTR in nfs4_client_to_reclaim(), null pointer dereference is triggered.

[ T1205] ================================================================== [ T1205] BUG: KASAN: null-ptr-deref in nfs4_client_to_reclaim+0xe9/0x260 [ T1205] Read of size 1 at addr 0000000000000010 by task nfsdcld/1205 [ T1205] [ T1205] CPU: 11 PID: 1205 Comm: nfsdcld Not tainted 5.10.0-00003-g2c1423731b8d #406 [ T1205] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014 [ T1205] Call Trace: [ T1205] dump_stack+0x9a/0xd0 [ T1205] ? nfs4_client_to_reclaim+0xe9/0x260 [ T1205] __kasan_report.cold+0x34/0x84 [ T1205] ? nfs4_client_to_reclaim+0xe9/0x260 [ T1205] kasan_report+0x3a/0x50 [ T1205] nfs4_client_to_reclaim+0xe9/0x260 [ T1205] ? nfsd4_release_lockowner+0x410/0x410 [ T1205] cld_pipe_downcall+0x5ca/0x760 [ T1205] ? nfsd4_cld_tracking_exit+0x1d0/0x1d0 [ T1205] ? down_write_killable_nested+0x170/0x170 [ T1205] ? avc_policy_seqno+0x28/0x40 [ T1205] ? selinux_file_permission+0x1b4/0x1e0 [ T1205] rpc_pipe_write+0x84/0xb0 [ T1205] vfs_write+0x143/0x520 [ T1205] ksys_write+0xc9/0x170 [ T1205] ? __ia32_sys_read+0x50/0x50 [ T1205] ? ktime_get_coarse_real_ts64+0xfe/0x110 [ T1205] ? ktime_get_coarse_real_ts64+0xa2/0x110 [ T1205] do_syscall_64+0x33/0x40 [ T1205] entry_SYSCALL_64_after_hwframe+0x67/0xd1 [ T1205] RIP: 0033:0x7fdbdb761bc7 [ T1205] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 514 [ T1205] RSP: 002b:00007fff8c4b7248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ T1205] RAX: ffffffffffffffda RBX: 000000000000042b RCX: 00007fdbdb761bc7 [ T1205] RDX: 000000000000042b RSI: 00007fff8c4b75f0 RDI: 0000000000000008 [ T1205] RBP: 00007fdbdb761bb0 R08: 0000000000000000 R09: 0000000000000001 [ T1205] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000042b [ T1205] R13: 0000000000000008 R14: 00007fff8c4b75f0 R15: 0000000000000000 [ T1205] ==================================================================

Fix it by checking namelen.

Show details on source website

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{
   affected: [],
   aliases: [
      "CVE-2024-47692",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-476",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-10-21T12:15:05Z",
      severity: "MODERATE",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: return -EINVAL when namelen is 0\n\nWhen we have a corrupted main.sqlite in /var/lib/nfs/nfsdcld/, it may\nresult in namelen being 0, which will cause memdup_user() to return\nZERO_SIZE_PTR.\nWhen we access the name.data that has been assigned the value of\nZERO_SIZE_PTR in nfs4_client_to_reclaim(), null pointer dereference is\ntriggered.\n\n[ T1205] ==================================================================\n[ T1205] BUG: KASAN: null-ptr-deref in nfs4_client_to_reclaim+0xe9/0x260\n[ T1205] Read of size 1 at addr 0000000000000010 by task nfsdcld/1205\n[ T1205]\n[ T1205] CPU: 11 PID: 1205 Comm: nfsdcld Not tainted 5.10.0-00003-g2c1423731b8d #406\n[ T1205] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014\n[ T1205] Call Trace:\n[ T1205]  dump_stack+0x9a/0xd0\n[ T1205]  ? nfs4_client_to_reclaim+0xe9/0x260\n[ T1205]  __kasan_report.cold+0x34/0x84\n[ T1205]  ? nfs4_client_to_reclaim+0xe9/0x260\n[ T1205]  kasan_report+0x3a/0x50\n[ T1205]  nfs4_client_to_reclaim+0xe9/0x260\n[ T1205]  ? nfsd4_release_lockowner+0x410/0x410\n[ T1205]  cld_pipe_downcall+0x5ca/0x760\n[ T1205]  ? nfsd4_cld_tracking_exit+0x1d0/0x1d0\n[ T1205]  ? down_write_killable_nested+0x170/0x170\n[ T1205]  ? avc_policy_seqno+0x28/0x40\n[ T1205]  ? selinux_file_permission+0x1b4/0x1e0\n[ T1205]  rpc_pipe_write+0x84/0xb0\n[ T1205]  vfs_write+0x143/0x520\n[ T1205]  ksys_write+0xc9/0x170\n[ T1205]  ? __ia32_sys_read+0x50/0x50\n[ T1205]  ? ktime_get_coarse_real_ts64+0xfe/0x110\n[ T1205]  ? ktime_get_coarse_real_ts64+0xa2/0x110\n[ T1205]  do_syscall_64+0x33/0x40\n[ T1205]  entry_SYSCALL_64_after_hwframe+0x67/0xd1\n[ T1205] RIP: 0033:0x7fdbdb761bc7\n[ T1205] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 514\n[ T1205] RSP: 002b:00007fff8c4b7248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\n[ T1205] RAX: ffffffffffffffda RBX: 000000000000042b RCX: 00007fdbdb761bc7\n[ T1205] RDX: 000000000000042b RSI: 00007fff8c4b75f0 RDI: 0000000000000008\n[ T1205] RBP: 00007fdbdb761bb0 R08: 0000000000000000 R09: 0000000000000001\n[ T1205] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000042b\n[ T1205] R13: 0000000000000008 R14: 00007fff8c4b75f0 R15: 0000000000000000\n[ T1205] ==================================================================\n\nFix it by checking namelen.",
   id: "GHSA-8qr4-5p7h-w8mm",
   modified: "2024-11-08T18:30:44Z",
   published: "2024-10-21T12:30:55Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-47692",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/0f1d007bbea38a61cf9c5392708dc70ae9d84a3d",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/1ff8be8d008b9ddc8e7043fbddd37d5d451b271b",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/22451a16b7ab7debefce660672566be887db1637",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/318f70857caab3da9a6ada9bc8c1f4f7591b695e",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/6d07040ae5c2214e39c7444d898039c9e655a79a",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/766d5fbd78f7a52b3888449a0358760477b74602",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/84a563d136faf514fdad1ade28d7a142fd313cb8",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/b7b7a8df41ef18862dd6b22289fb46c2c12398af",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
         type: "CVSS_V3",
      },
   ],
}


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