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CVE-2025-38067

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.240, 5.15.189, 6.1.146, 6.6.99, 6.12.39, and 1 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From d7822b1e24f2df5df98c76f0e94a5416349ff759 · fixed in 48900d839a3454050fd5822e34be8d54c4ec9b86; From d7822b1e24f2df5df98c76f0e94a5416349ff759 · fixed in 3e4028ef31b69286c9d4878cee0330235f53f218; From d7822b1e24f2df5df98c76f0e94a5416349ff759 · fixed in b2b05d0dc2f4f0646922068af435aed5763d16ba; From d7822b1e24f2df5df98c76f0e94a5416349ff759 · fixed in eaf112069a904b6207b4106ff083e0208232a2eb; From d7822b1e24f2df5df98c76f0e94a5416349ff759 · fixed in f004f58d18a2d3dc761cf973ad27b4a5997bd876; From d7822b1e24f2df5df98c76f0e94a5416349ff759 · fixed in 2df285dab00fa03a3ef939b6cb0d0d0aeb0791db; From d7822b1e24f2df5df98c76f0e94a5416349ff759 · fixed in fd881d0a085fc54354414aed990ccf05f282ba53

  • Linux Linux

    4.18

  • KernelLinux

    From 4.18.0 · fixed in 5.10.240; From 5.11.0 · fixed in 5.15.189; From 5.16.0 · fixed in 6.1.146; From 6.2.0 · fixed in 6.6.99; From 6.7.0 · fixed in 6.12.39; From 6.13.0 · fixed in 6.14.9

References 7

git.kernel.org