ocfs2: validate lengths in dlm_mig_lockres_handler
In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate lengths in dlm_mig_lockres_handler A node receiving a DLM_MIG_LOCKRES message trusts several fields of the peer-supplied dlm_migratable_lockres without validation. num_locks and lockname_len are bounded only on the sending side, and the message is never checked to actually carry num_locks migratable_lock entries. As a result dlm_process_recovery_data() walks mres->ml[0..num_locks) past the kmalloc(data_len) copy of the message (an out-of-bounds read that ends in a BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the fixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write). Both are reachable by any node in the domain. Validate these fields right after dlm_grab(), before anything uses them -- including the not-joined error path, which already prints mres->lockname with the unbounded lockname_len as a %.*s precision. Reject the message unless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <= DLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the payload is large enough to hold the claimed locks. Conforming recovery and migration messages are unaffected.
CVE-2026-89494
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89494
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "4a5798253212093b9ff7d90c6cfbe348bcda1594",
"versionType": "git"
},
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "dce05b17db862f47ff60614017abe639b2e71cad",
"versionType": "git"
},
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "0e999d56917f861f97adb961617b1828c9eb4733",
"versionType": "git"
},
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "77686fa5bba135252d348e2dacf481fc19f60c41",
"versionType": "git"
},
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "f33041906885f96e190cde54e61ddc69de39e3ee",
"versionType": "git"
},
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "50c4cc9183e11f83427efbf770f54851f4471c02",
"versionType": "git"
},
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "a8facb1670b4a0612183198e758d9539ef628ed9",
"versionType": "git"
},
{
"status": "affected",
"version": "6714d8e86bf443f6f7af50f9d432025649f091f5",
"lessThan": "b54e03d9b3697d25f4a0063cf717d459c5e3ad94",
"versionType": "git"
}
],
"programFiles": [
"fs/ocfs2/dlm/dlmrecovery.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ocfs2/dlm/dlmrecovery.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89494
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #35020 · Revision 1
- Added to Heist Feed
- Publisher date