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. 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

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 10% of CVEs (scores of 2026-10-25)

Published

2025-07-25

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• linux:linux_kernel

References

• https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b
• https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54
• https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39
• https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386
• https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db

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