CVE-2026-46052 (GCVE-0-2026-46052)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:57 – Updated: 2026-08-05 12:29
VLAI
EPSS
VEX
Title
ceph: only d_add() negative dentries when they are unhashed
Summary
In the Linux kernel, the following vulnerability has been resolved:
ceph: only d_add() negative dentries when they are unhashed
Ceph can call d_add(dentry, NULL) on a negative dentry that is already
present in the primary dcache hash.
In the current VFS that is not safe. d_add() goes through __d_add()
to __d_rehash(), which unconditionally reinserts dentry->d_hash into
the hlist_bl bucket. If the dentry is already hashed, reinserting the
same node can corrupt the bucket, including creating a self-loop.
Once that happens, __d_lookup() can spin forever in the hlist_bl walk,
typically looping only on the d_name.hash mismatch check and
eventually triggering RCU stall reports like this one:
rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 87-....: (2100 ticks this GP) idle=3a4c/1/0x4000000000000000 softirq=25003319/25003319 fqs=829
rcu: (t=2101 jiffies g=79058445 q=698988 ncpus=192)
CPU: 87 UID: 2952868916 PID: 3933303 Comm: php-cgi8.3 Not tainted 6.18.17-i1-amd #950 NONE
Hardware name: Dell Inc. PowerEdge R7615/0G9DHV, BIOS 1.6.6 09/22/2023
RIP: 0010:__d_lookup+0x46/0xb0
Code: c1 e8 07 48 8d 04 c2 48 8b 00 49 89 fc 49 89 f5 48 89 c3 48 83 e3 fe 48 83 f8 01 77 0f eb 2d 0f 1f 44 00 00 48 8b 1b 48 85 db <74> 20 39 6b 18 75 f3 48 8d 7b 78 e8 ba 85 d0 00 4c 39 63 10 74 1f
RSP: 0018:ff745a70c8253898 EFLAGS: 00000282
RAX: ff26e470054cb208 RBX: ff26e470054cb208 RCX: 000000006e958966
RDX: ff26e48267340000 RSI: ff745a70c82539b0 RDI: ff26e458f74655c0
RBP: 000000006e958966 R08: 0000000000000180 R09: 9cd08d909b919a89
R10: ff26e458f74655c0 R11: 0000000000000000 R12: ff26e458f74655c0
R13: ff745a70c82539b0 R14: d0d0d0d0d0d0d0d0 R15: 2f2f2f2f2f2f2f2f
FS: 00007f5770896980(0000) GS:ff26e482c5d88000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5764de50c0 CR3: 000000a72abb5001 CR4: 0000000000771ef0
PKRU: 55555554
Call Trace:
<TASK>
lookup_fast+0x9f/0x100
walk_component+0x1f/0x150
link_path_walk+0x20e/0x3d0
path_lookupat+0x68/0x180
filename_lookup+0xdc/0x1e0
vfs_statx+0x6c/0x140
vfs_fstatat+0x67/0xa0
__do_sys_newfstatat+0x24/0x60
do_syscall_64+0x6a/0x230
entry_SYSCALL_64_after_hwframe+0x76/0x7e
This is reachable with reused cached negative dentries. A Ceph lookup
or atomic_open can be handed a negative dentry that is already hashed,
and fs/ceph/dir.c then hits one of two paths that incorrectly assume
"negative" also means "unhashed":
- ceph_finish_lookup():
MDS reply is -ENOENT with no trace
-> d_add(dentry, NULL)
- ceph_lookup():
local ENOENT fast path for a complete directory with shared caps
-> d_add(dentry, NULL)
Both paths can therefore re-add an already-hashed negative dentry.
Ceph already uses the correct pattern elsewhere: ceph_fill_trace() only
calls d_add(dn, NULL) for a negative null-dentry reply when d_unhashed(dn)
is true.
Fix both fs/ceph/dir.c sites the same way: only call d_add() for a
negative dentry when it is actually unhashed. If the negative dentry
is already hashed, leave it in place and reuse it as-is.
This preserves the existing behavior for unhashed dentries while
avoiding d_hash list corruption for reused hashed negatives.
Severity
7.5 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2817b000b02c5f0c05af67c01fb2684e1381d6ef , < 4147ae08824cc8b65d2b2018f79d416af2937108
(git)
Affected: 2817b000b02c5f0c05af67c01fb2684e1381d6ef , < 73b47a1f06dee5e61b00dee5227d75d3f1f6d977 (git) Affected: 2817b000b02c5f0c05af67c01fb2684e1381d6ef , < 79ffcbeac6bc1dc1bcdb0434acf250f6215ec111 (git) Affected: 2817b000b02c5f0c05af67c01fb2684e1381d6ef , < 83ce43a21bb7df8dd52228afdd918d2d058eefde (git) Affected: 2817b000b02c5f0c05af67c01fb2684e1381d6ef , < 4179cc390dacebc87079419ec92f86f3dc46294d (git) Affected: 2817b000b02c5f0c05af67c01fb2684e1381d6ef , < b91e535f208c48a5e7464f1aa38338a30e7912df (git) Affected: 2817b000b02c5f0c05af67c01fb2684e1381d6ef , < 2010cb06b9df7d3c816c78358c566bdacbdf38ff (git) Affected: 2817b000b02c5f0c05af67c01fb2684e1381d6ef , < 803447f93d75ab6e40c85e6d12b5630d281d70d6 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.34
Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/ceph/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4147ae08824cc8b65d2b2018f79d416af2937108",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "73b47a1f06dee5e61b00dee5227d75d3f1f6d977",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "79ffcbeac6bc1dc1bcdb0434acf250f6215ec111",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "83ce43a21bb7df8dd52228afdd918d2d058eefde",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "4179cc390dacebc87079419ec92f86f3dc46294d",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "b91e535f208c48a5e7464f1aa38338a30e7912df",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "2010cb06b9df7d3c816c78358c566bdacbdf38ff",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "803447f93d75ab6e40c85e6d12b5630d281d70d6",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/ceph/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"lessThan": "2.6.34",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.86",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.27",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.259",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.210",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.176",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.140",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.86",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.27",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.4",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "2.6.34",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: only d_add() negative dentries when they are unhashed\n\nCeph can call d_add(dentry, NULL) on a negative dentry that is already\npresent in the primary dcache hash.\n\nIn the current VFS that is not safe. d_add() goes through __d_add()\nto __d_rehash(), which unconditionally reinserts dentry-\u003ed_hash into\nthe hlist_bl bucket. If the dentry is already hashed, reinserting the\nsame node can corrupt the bucket, including creating a self-loop.\nOnce that happens, __d_lookup() can spin forever in the hlist_bl walk,\ntypically looping only on the d_name.hash mismatch check and\neventually triggering RCU stall reports like this one:\n\n rcu: INFO: rcu_sched self-detected stall on CPU\n rcu: 87-....: (2100 ticks this GP) idle=3a4c/1/0x4000000000000000 softirq=25003319/25003319 fqs=829\n rcu: (t=2101 jiffies g=79058445 q=698988 ncpus=192)\n CPU: 87 UID: 2952868916 PID: 3933303 Comm: php-cgi8.3 Not tainted 6.18.17-i1-amd #950 NONE\n Hardware name: Dell Inc. PowerEdge R7615/0G9DHV, BIOS 1.6.6 09/22/2023\n RIP: 0010:__d_lookup+0x46/0xb0\n Code: c1 e8 07 48 8d 04 c2 48 8b 00 49 89 fc 49 89 f5 48 89 c3 48 83 e3 fe 48 83 f8 01 77 0f eb 2d 0f 1f 44 00 00 48 8b 1b 48 85 db \u003c74\u003e 20 39 6b 18 75 f3 48 8d 7b 78 e8 ba 85 d0 00 4c 39 63 10 74 1f\n RSP: 0018:ff745a70c8253898 EFLAGS: 00000282\n RAX: ff26e470054cb208 RBX: ff26e470054cb208 RCX: 000000006e958966\n RDX: ff26e48267340000 RSI: ff745a70c82539b0 RDI: ff26e458f74655c0\n RBP: 000000006e958966 R08: 0000000000000180 R09: 9cd08d909b919a89\n R10: ff26e458f74655c0 R11: 0000000000000000 R12: ff26e458f74655c0\n R13: ff745a70c82539b0 R14: d0d0d0d0d0d0d0d0 R15: 2f2f2f2f2f2f2f2f\n FS: 00007f5770896980(0000) GS:ff26e482c5d88000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f5764de50c0 CR3: 000000a72abb5001 CR4: 0000000000771ef0\n PKRU: 55555554\n Call Trace:\n \u003cTASK\u003e\n lookup_fast+0x9f/0x100\n walk_component+0x1f/0x150\n link_path_walk+0x20e/0x3d0\n path_lookupat+0x68/0x180\n filename_lookup+0xdc/0x1e0\n vfs_statx+0x6c/0x140\n vfs_fstatat+0x67/0xa0\n __do_sys_newfstatat+0x24/0x60\n do_syscall_64+0x6a/0x230\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThis is reachable with reused cached negative dentries. A Ceph lookup\nor atomic_open can be handed a negative dentry that is already hashed,\nand fs/ceph/dir.c then hits one of two paths that incorrectly assume\n\"negative\" also means \"unhashed\":\n\n - ceph_finish_lookup():\n MDS reply is -ENOENT with no trace\n -\u003e d_add(dentry, NULL)\n\n - ceph_lookup():\n local ENOENT fast path for a complete directory with shared caps\n -\u003e d_add(dentry, NULL)\n\nBoth paths can therefore re-add an already-hashed negative dentry.\n\nCeph already uses the correct pattern elsewhere: ceph_fill_trace() only\ncalls d_add(dn, NULL) for a negative null-dentry reply when d_unhashed(dn)\nis true.\n\nFix both fs/ceph/dir.c sites the same way: only call d_add() for a\nnegative dentry when it is actually unhashed. If the negative dentry\nis already hashed, leave it in place and reuse it as-is.\n\nThis preserves the existing behavior for unhashed dentries while\navoiding d_hash list corruption for reused hashed negatives."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Ceph is a network filesystem client; the vulnerable `ceph_finish_lookup()` path is driven directly by remote MDS reply data (-ENOENT with no trace), so a malicious/compromised MDS or on-path attacker injecting crafted replies can drive the buggy `d_add()` on a hashed negative dentry. Processing remote-peer data places this at Network.\nAC:L - The corruption arose naturally in production from an ordinary `newfstatat`, showing the precondition (a reused already-hashed negative dentry) is reliably reachable; an attacker controlling MDS replies/lease grants can deterministically set up the cached negative dentry and re-lookup with no race outside their control.\nPR:N - A network attacker who controls or impersonates the MDS (or MITMs the unauthenticated msgr path) needs no privileges or credentials on the victim client to feed the -ENOENT-no-trace replies that trigger the vulnerable code.\nUI:N - On an established Ceph mount, path lookups/stats occur continuously as part of normal operation, so no specific victim action is required at exploit time.\nS:U - The corruption and resulting hang are entirely within the kernel\u0027s own dcache; no security boundary (VM, IOMMU, sandbox) is crossed.\nC:N - The bug creates a self-referential cycle in an hlist_bl hash bucket and leaks no memory contents; there is no out-of-bounds or use-after-free read primitive.\nI:N - The only state altered is an internal dcache list pointer forming a loop; this provides no attacker-controllable write primitive and modifies no user or security-relevant data.\nA:H - `__d_lookup()` spins forever on the corrupted bucket, producing RCU stalls and a hung/softlocked CPU \u2014 a kernel-level denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:29:20.131Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/4147ae08824cc8b65d2b2018f79d416af2937108"
},
{
"url": "https://git.kernel.org/stable/c/73b47a1f06dee5e61b00dee5227d75d3f1f6d977"
},
{
"url": "https://git.kernel.org/stable/c/79ffcbeac6bc1dc1bcdb0434acf250f6215ec111"
},
{
"url": "https://git.kernel.org/stable/c/83ce43a21bb7df8dd52228afdd918d2d058eefde"
},
{
"url": "https://git.kernel.org/stable/c/4179cc390dacebc87079419ec92f86f3dc46294d"
},
{
"url": "https://git.kernel.org/stable/c/b91e535f208c48a5e7464f1aa38338a30e7912df"
},
{
"url": "https://git.kernel.org/stable/c/2010cb06b9df7d3c816c78358c566bdacbdf38ff"
},
{
"url": "https://git.kernel.org/stable/c/803447f93d75ab6e40c85e6d12b5630d281d70d6"
}
],
"title": "ceph: only d_add() negative dentries when they are unhashed",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-46052",
"datePublished": "2026-05-27T12:57:10.777Z",
"dateReserved": "2026-05-13T15:03:33.094Z",
"dateUpdated": "2026-08-05T12:29:20.131Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-46052",
"date": "2026-10-11",
"epss": "0.00716",
"percentile": "0.52454"
},
"microsoft_vex": {
"current_release_date": "2026-06-09T14:42:29.000Z",
"cve": "CVE-2026-46052",
"id": "msrc_CVE-2026-46052",
"initial_release_date": "2026-05-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ceph: only d_add() negative dentries when they are unhashed",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46052.json",
"version": "4"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/ceph/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4147ae08824cc8b65d2b2018f79d416af2937108",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "73b47a1f06dee5e61b00dee5227d75d3f1f6d977",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "79ffcbeac6bc1dc1bcdb0434acf250f6215ec111",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "83ce43a21bb7df8dd52228afdd918d2d058eefde",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "4179cc390dacebc87079419ec92f86f3dc46294d",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "b91e535f208c48a5e7464f1aa38338a30e7912df",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "2010cb06b9df7d3c816c78358c566bdacbdf38ff",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
},
{
"lessThan": "803447f93d75ab6e40c85e6d12b5630d281d70d6",
"status": "affected",
"version": "2817b000b02c5f0c05af67c01fb2684e1381d6ef",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/ceph/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"lessThan": "2.6.34",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.86",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.27",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "86294DD1-E89E-436E-80BC-95171A8D719F",
"versionEndExcluding": "6.6.140",
"versionStartIncluding": "2.6.34.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "55DA1C62-9991-451E-B8A8-E0004E00F789",
"versionEndExcluding": "6.12.86",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A10AC84F-C058-47D5-85B4-E6E51A613B74",
"versionEndExcluding": "6.18.27",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3",
"versionEndExcluding": "7.0.4",
"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:-:*:*:*:*:*:*",
"matchCriteriaId": "A3B1BC1D-ED46-4364-A1D9-1FA74182B03A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:rc2:*:*:*:*:*:*",
"matchCriteriaId": "86D3F64C-3F27-43E0-B0D4-62CE1E1F4EFB",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:rc3:*:*:*:*:*:*",
"matchCriteriaId": "7927713B-5EB0-41EB-86A9-9935775162E0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:rc4:*:*:*:*:*:*",
"matchCriteriaId": "59037296-3143-4FBB-AFF7-D4FE2C85502F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:rc5:*:*:*:*:*:*",
"matchCriteriaId": "9CA27FD5-7DBF-4C85-80A9-D523B2E4B033",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:rc6:*:*:*:*:*:*",
"matchCriteriaId": "9711E333-A8E7-4F4B-BCFD-2023E889651A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:rc7:*:*:*:*:*:*",
"matchCriteriaId": "E04D3358-973B-42A1-8E08-2E3AE947193C",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: only d_add() negative dentries when they are unhashed\n\nCeph can call d_add(dentry, NULL) on a negative dentry that is already\npresent in the primary dcache hash.\n\nIn the current VFS that is not safe. d_add() goes through __d_add()\nto __d_rehash(), which unconditionally reinserts dentry-\u003ed_hash into\nthe hlist_bl bucket. If the dentry is already hashed, reinserting the\nsame node can corrupt the bucket, including creating a self-loop.\nOnce that happens, __d_lookup() can spin forever in the hlist_bl walk,\ntypically looping only on the d_name.hash mismatch check and\neventually triggering RCU stall reports like this one:\n\n rcu: INFO: rcu_sched self-detected stall on CPU\n rcu: 87-....: (2100 ticks this GP) idle=3a4c/1/0x4000000000000000 softirq=25003319/25003319 fqs=829\n rcu: (t=2101 jiffies g=79058445 q=698988 ncpus=192)\n CPU: 87 UID: 2952868916 PID: 3933303 Comm: php-cgi8.3 Not tainted 6.18.17-i1-amd #950 NONE\n Hardware name: Dell Inc. PowerEdge R7615/0G9DHV, BIOS 1.6.6 09/22/2023\n RIP: 0010:__d_lookup+0x46/0xb0\n Code: c1 e8 07 48 8d 04 c2 48 8b 00 49 89 fc 49 89 f5 48 89 c3 48 83 e3 fe 48 83 f8 01 77 0f eb 2d 0f 1f 44 00 00 48 8b 1b 48 85 db \u003c74\u003e 20 39 6b 18 75 f3 48 8d 7b 78 e8 ba 85 d0 00 4c 39 63 10 74 1f\n RSP: 0018:ff745a70c8253898 EFLAGS: 00000282\n RAX: ff26e470054cb208 RBX: ff26e470054cb208 RCX: 000000006e958966\n RDX: ff26e48267340000 RSI: ff745a70c82539b0 RDI: ff26e458f74655c0\n RBP: 000000006e958966 R08: 0000000000000180 R09: 9cd08d909b919a89\n R10: ff26e458f74655c0 R11: 0000000000000000 R12: ff26e458f74655c0\n R13: ff745a70c82539b0 R14: d0d0d0d0d0d0d0d0 R15: 2f2f2f2f2f2f2f2f\n FS: 00007f5770896980(0000) GS:ff26e482c5d88000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f5764de50c0 CR3: 000000a72abb5001 CR4: 0000000000771ef0\n PKRU: 55555554\n Call Trace:\n \u003cTASK\u003e\n lookup_fast+0x9f/0x100\n walk_component+0x1f/0x150\n link_path_walk+0x20e/0x3d0\n path_lookupat+0x68/0x180\n filename_lookup+0xdc/0x1e0\n vfs_statx+0x6c/0x140\n vfs_fstatat+0x67/0xa0\n __do_sys_newfstatat+0x24/0x60\n do_syscall_64+0x6a/0x230\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThis is reachable with reused cached negative dentries. A Ceph lookup\nor atomic_open can be handed a negative dentry that is already hashed,\nand fs/ceph/dir.c then hits one of two paths that incorrectly assume\n\"negative\" also means \"unhashed\":\n\n - ceph_finish_lookup():\n MDS reply is -ENOENT with no trace\n -\u003e d_add(dentry, NULL)\n\n - ceph_lookup():\n local ENOENT fast path for a complete directory with shared caps\n -\u003e d_add(dentry, NULL)\n\nBoth paths can therefore re-add an already-hashed negative dentry.\n\nCeph already uses the correct pattern elsewhere: ceph_fill_trace() only\ncalls d_add(dn, NULL) for a negative null-dentry reply when d_unhashed(dn)\nis true.\n\nFix both fs/ceph/dir.c sites the same way: only call d_add() for a\nnegative dentry when it is actually unhashed. If the negative dentry\nis already hashed, leave it in place and reuse it as-is.\n\nThis preserves the existing behavior for unhashed dentries while\navoiding d_hash list corruption for reused hashed negatives."
}
],
"id": "CVE-2026-46052",
"lastModified": "2026-06-19T13:16:32.420",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-05-27T14:17:24.807",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2010cb06b9df7d3c816c78358c566bdacbdf38ff"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4147ae08824cc8b65d2b2018f79d416af2937108"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/4179cc390dacebc87079419ec92f86f3dc46294d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/73b47a1f06dee5e61b00dee5227d75d3f1f6d977"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/79ffcbeac6bc1dc1bcdb0434acf250f6215ec111"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/803447f93d75ab6e40c85e6d12b5630d281d70d6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/83ce43a21bb7df8dd52228afdd918d2d058eefde"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b91e535f208c48a5e7464f1aa38338a30e7912df"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-05T14:50:47+00:00",
"cve": "CVE-2026-46052",
"id": "CVE-2026-46052",
"initial_release_date": "2026-05-27T00:00:00+00:00",
"product_status:known_affected": "260",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ceph: only d_add() negative dentries when they are unhashed",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46052.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-19T01:55:48Z",
"cve": "CVE-2026-46052",
"id": "CVE-2026-46052",
"initial_release_date": "2026-05-28T03:53:37Z",
"product_status:known_affected": "513",
"product_status:known_not_affected": "64",
"product_status:recommended": "301",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46052",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46052.json",
"version": "24"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.