Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d7822b1e24f2df5df98c76f0e94a5416349ff759 before 48900d839a3454050fd5822e34be8d54c4ec9b86; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 before 3e4028ef31b69286c9d4878cee0330235f53f218; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 before b2b05d0dc2f4f0646922068af435aed5763d16ba; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 before eaf112069a904b6207b4106ff083e0208232a2eb; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 before f004f58d18a2d3dc761cf973ad27b4a5997bd876; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 before 2df285dab00fa03a3ef939b6cb0d0d0aeb0791db; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 before fd881d0a085fc54354414aed990ccf05f282ba53 |
| Linux / Linux | affected 4.18; unaffected 0 before 4.18; unaffected 5.10.240 through 5.10.*; unaffected 5.15.189 through 5.15.*; unaffected 6.1.146 through 6.1.*; unaffected 6.6.99 through 6.6.*; unaffected 6.12.39 through 6.12.*; unaffected 6.14.9 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/48900d839a3454050fd5822e34be8d54c4ec9b86
- https://git.kernel.org/stable/c/3e4028ef31b69286c9d4878cee0330235f53f218
- https://git.kernel.org/stable/c/b2b05d0dc2f4f0646922068af435aed5763d16ba
- https://git.kernel.org/stable/c/eaf112069a904b6207b4106ff083e0208232a2eb
- https://git.kernel.org/stable/c/f004f58d18a2d3dc761cf973ad27b4a5997bd876
- https://git.kernel.org/stable/c/2df285dab00fa03a3ef939b6cb0d0d0aeb0791db
- https://git.kernel.org/stable/c/fd881d0a085fc54354414aed990ccf05f282ba53
ADP enrichment
No English description supplied.
No English description supplied.