In the Linux kernel, the following vulnerability has been resolved: perf: Fix sample vs do_exit() Baisheng Gao reported an ARM64 crash, which Mark decoded as being a synchronous external abort -- most likely due to trying to access MMIO in bad ways. The crash further shows perf trying to do a user stack sample while in exit_mmap()'s tlb_finish_mmu() -- i.e. while tearing down the address space it is trying to access. It turns out that we stop perf after we tear down the userspace mm; a receipie for disaster, since perf likes to access userspace for various reasons. Flip this order by moving up where we stop perf in do_exit(). Additionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER to abort when the current task does not have an mm (exit_mm() makes sure to set current->mm = NULL; before commencing with the actual teardown). Such that CPU wide events don't trip on this same problem.
Fix
Patch, vendor advisory and mitigation references on NVD 8
- https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b Patch
- https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54 Patch
- https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39 Patch
- https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386 Patch
- https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db Patch
- https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e Patch
- https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964 Patch
- https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.5 · linux, debianNVD modified 2026-10-15 22:18
Affected (CPE criteria) 4
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
References 10
- https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b Patch
- https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54 Patch
- https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39 Patch
- https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386 Patch
- https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db Patch
- https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e Patch
- https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964 Patch
- https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Mailing List, Third Party Advisory