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CVE-2025-38067
published 2025-06-18

CVE-2025-38067: 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…

medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
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

35 ranges· showing 25
VendorProductVersion rangeFixed in
debiandebian_linux
debianlinux< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
debianlinux-6.1< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
linuxlinux
linuxlinux>= d7822b1e24f2df5df98c76f0e94a5416349ff759 < 48900d839a3454050fd5822e34be8d54c4ec9b8648900d839a3454050fd5822e34be8d54c4ec9b86
linuxlinux>= d7822b1e24f2df5df98c76f0e94a5416349ff759 < 3e4028ef31b69286c9d4878cee0330235f53f2183e4028ef31b69286c9d4878cee0330235f53f218
linuxlinux>= d7822b1e24f2df5df98c76f0e94a5416349ff759 < b2b05d0dc2f4f0646922068af435aed5763d16bab2b05d0dc2f4f0646922068af435aed5763d16ba
linuxlinux>= d7822b1e24f2df5df98c76f0e94a5416349ff759 < eaf112069a904b6207b4106ff083e0208232a2ebeaf112069a904b6207b4106ff083e0208232a2eb
linuxlinux>= d7822b1e24f2df5df98c76f0e94a5416349ff759 < f004f58d18a2d3dc761cf973ad27b4a5997bd876f004f58d18a2d3dc761cf973ad27b4a5997bd876
linuxlinux>= d7822b1e24f2df5df98c76f0e94a5416349ff759 < 2df285dab00fa03a3ef939b6cb0d0d0aeb0791db2df285dab00fa03a3ef939b6cb0d0d0aeb0791db
linuxlinux>= d7822b1e24f2df5df98c76f0e94a5416349ff759 < fd881d0a085fc54354414aed990ccf05f282ba53fd881d0a085fc54354414aed990ccf05f282ba53
linuxlinux_kernel>= 0 < 5.10.244-15.10.244-1
linuxlinux_kernel>= 0 < 6.1.147-16.1.147-1
linuxlinux_kernel>= 0 < 6.12.41-16.12.41-1
linuxlinux_kernel>= 0 < 6.16.3-16.16.3-1
linuxlinux_kernel>= 0 < 5.15.0-156.1665.15.0-156.166
linuxlinux_kernel>= 0 < 6.8.0-100.1006.8.0-100.100
linuxlinux_kernel>= 4.18 < 5.10.2405.10.240
linuxlinux_kernel>= 5.11 < 5.15.1895.15.189
linuxlinux_kernel>= 5.16 < 6.1.1466.1.146
linuxlinux_kernel>= 6.13 < 6.14.96.14.9
linuxlinux_kernel>= 6.2 < 6.6.996.6.99
linuxlinux_kernel>= 6.7 < 6.12.396.12.39
msrcazl3_kernel_6.6.96.2-1_on_azure_linux_3.0
msrcazl3_kernel_6.6.96.2-2_on_azure_linux_3.0

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM