CVE-2025-38424
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.
Does this matter?
Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99bPatch
- https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54Patch
- https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39Patch
- https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386Patch
- https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0dbPatch
- https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34ePatch
- https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964Patch
- https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160fPatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.