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

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2026-11-05 20:52
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 20:48 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6651 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
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