# CVE-2024-26710: linux: In the Linux kernel, the following vulnerability has been resolved:  powerpc/kasan: Limit KASAN thread size increase...

CVE-2024-26710 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26710, released April 3, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-26710
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 3, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.8.9-1 | [DEBIAN-CVE-2024-26710](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26710.md) | Apr 3, 2024 |
| Linux | linux Debian 14 | 6.8.9-1 | [DEBIAN-CVE-2024-26710](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26710.md) | Apr 3, 2024 |

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