CVE-2025-38067 (GCVE-0-2025-38067)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2025-11-03 17:33
VLAI?
Title
rseq: Fix segfault on registration when rseq_cs is non-zero
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d7822b1e24f2df5df98c76f0e94a5416349ff759 , < 48900d839a3454050fd5822e34be8d54c4ec9b86 (git)
Affected: d7822b1e24f2df5df98c76f0e94a5416349ff759 , < 3e4028ef31b69286c9d4878cee0330235f53f218 (git)
Affected: d7822b1e24f2df5df98c76f0e94a5416349ff759 , < b2b05d0dc2f4f0646922068af435aed5763d16ba (git)
Affected: d7822b1e24f2df5df98c76f0e94a5416349ff759 , < eaf112069a904b6207b4106ff083e0208232a2eb (git)
Affected: d7822b1e24f2df5df98c76f0e94a5416349ff759 , < f004f58d18a2d3dc761cf973ad27b4a5997bd876 (git)
Affected: d7822b1e24f2df5df98c76f0e94a5416349ff759 , < 2df285dab00fa03a3ef939b6cb0d0d0aeb0791db (git)
Affected: d7822b1e24f2df5df98c76f0e94a5416349ff759 , < fd881d0a085fc54354414aed990ccf05f282ba53 (git)
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    Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.99 , ≤ 6.6.* (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.14.9 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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Esto puede resultar en una violaci\u00f3n de segmentaci\u00f3n al regresar al espacio de usuario si el valor almacenado en el campo rseq_cs no apunta a una estructura rseq_cs v\u00e1lida. La soluci\u00f3n correcta para esto ser\u00eda fallar el registro de rseq cuando el campo rseq_cs no es cero. Sin embargo, algunas versiones anteriores de glibc reutilizar\u00e1n el \u00e1rea rseq de subprocesos anteriores sin borrar el campo rseq_cs y tambi\u00e9n terminar\u00e1n el proceso si el registro de rseq falla en un subproceso secundario. Esto no fue detectado en las pruebas porque en este caso el rseq_cs restante apunta a una estructura rseq_cs v\u00e1lida. 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  • 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.
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  • 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.



Detection rules are retrieved from Rulezet.