CVE-2025-38067

Advisory lineage Upstream: 0 Downstream: 39
Modified
Published: 18 Jun 2025, 09:33
Last modified:12 May 2026, 12:04

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.13% LOW
0% probability +0.10%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

18 Jun 2025, 09:33
Published
Vulnerability first disclosed
12 May 2026, 12:04
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.13%• Percentile: 32%

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ d7822b1e24f2df5df98c76f0e94a5416349ff759, < 48900d839a3454050fd5822e34be8d54c4ec9b86 | ≥ d7822b1e24f2df5df98c76f0e94a5416349ff759, < 3e4028ef31b69286c9d4878cee0330235f53f218 | ≥ d7822b1e24f2df5df98c76f0e94a5416349ff759, < b2b05d0dc2f4f0646922068af435aed5763d16ba | ≥ d7822b1e24f2df5df98c76f0e94a5416349ff759, < eaf112069a904b6207b4106ff083e0208232a2eb | ≥ d7822b1e24f2df5df98c76f0e94a5416349ff759, < f004f58d18a2d3dc761cf973ad27b4a5997bd876 | ≥ d7822b1e24f2df5df98c76f0e94a5416349ff759, < 2df285dab00fa03a3ef939b6cb0d0d0aeb0791db | ≥ d7822b1e24f2df5df98c76f0e94a5416349ff759, < fd881d0a085fc54354414aed990ccf05f282ba53 | 4.18

  • linux•linux_kernel

    ≥ 4.18, < 5.10.240 | ≥ 5.11, < 5.15.189 | ≥ 5.16, < 6.1.146 | ≥ 6.2, < 6.6.99 | ≥ 6.7, < 6.12.39 | ≥ 6.13, < 6.14.9

References (10)