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locking/lockdep: Fix NULL pointer dereference in __lock_set_class()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: locking/lockdep: Fix NULL pointer dereference in __lock_set_class() register_lock_class() can return NULL when the lock class pool is exhausted, graph_lock() fails, or key validation fails. However, __lock_set_class() uses the return value directly in pointer arithmetic without a NULL check: class = register_lock_class(lock, subclass, 0); hlock->class_idx = class - lock_classes; If class is NULL, this computes a wild offset that corrupts hlock->class_idx. The subsequent reacquire_held_locks() call will invoke hlock_class() with this corrupted index, leading to a NULL or out-of-bounds pointer dereference. Add the missing NULL check, consistent with how __lock_acquire() already handles this case at the same call site.

Announced Source revision 1
Original source ↗

CVE-2026-93261

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-2026-93261

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": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "f6093ff67ea6e347574819ed23e96e0f82a25ffc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "f56e54fd24f05e9de528fcb77f6084f80c8066ce",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "5c3bff6cf26e6a54fbf8b893a879c32824d2d50d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "b2113dcd8238bf00ce37a34e67b29cf31d32a545",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "e7c69c6695d84220847cca62a45e879e71e79e9d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "9be10f49dfc2e4b472b3a5f346483b67374774b8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c",
        "lessThan": "7577e00b9ab506202b9f1a33de3cc8cc6413a4db",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/locking/lockdep.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.27"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.27",
        "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": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/locking/lockdep.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93261

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37954 · Revision 1
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Publisher date
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