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rseq: Fix segfault on registration when rseq_cs is non-zero

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: rseq: Fix segfault on registration when rseq_cs is non-zero The rseq_cs field is documented as being set to 0 by user-space prior to registration, however this is not currently enforced by the kernel. This can result in a segfault on return to user-space if the value stored in the rseq_cs field doesn't point to a valid struct rseq_cs. The correct solution to this would be to fail the rseq registration when the rseq_cs field is non-zero. However, some older versions of glibc will reuse the rseq area of previous threads without clearing the rseq_cs field and will also terminate the process if the rseq registration fails in a secondary thread. This wasn't caught in testing because in this case the leftover rseq_cs does point to a valid struct rseq_cs. What we can do is clear the rseq_cs field on registration when it's non-zero which will prevent segfaults on registration and won't break the glibc versions that reuse rseq areas on thread creation.

Announced Source revision 1
Original source ↗

CVE-2025-38067

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-2025-38067

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": "d7822b1e24f2df5df98c76f0e94a5416349ff759",
        "lessThan": "48900d839a3454050fd5822e34be8d54c4ec9b86",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7822b1e24f2df5df98c76f0e94a5416349ff759",
        "lessThan": "3e4028ef31b69286c9d4878cee0330235f53f218",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7822b1e24f2df5df98c76f0e94a5416349ff759",
        "lessThan": "b2b05d0dc2f4f0646922068af435aed5763d16ba",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7822b1e24f2df5df98c76f0e94a5416349ff759",
        "lessThan": "eaf112069a904b6207b4106ff083e0208232a2eb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7822b1e24f2df5df98c76f0e94a5416349ff759",
        "lessThan": "f004f58d18a2d3dc761cf973ad27b4a5997bd876",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7822b1e24f2df5df98c76f0e94a5416349ff759",
        "lessThan": "2df285dab00fa03a3ef939b6cb0d0d0aeb0791db",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7822b1e24f2df5df98c76f0e94a5416349ff759",
        "lessThan": "fd881d0a085fc54354414aed990ccf05f282ba53",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/rseq.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.240",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.189",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.146",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.99",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.39",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.14.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.14.*"
      },
      {
        "status": "unaffected",
        "version": "6.15",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/rseq.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38067

Source reference: /cveMetadata/cveId

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Event
#27012 · Revision 1
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