CVE-2026-23279

Advisory lineage Upstream: 0 Downstream: 11
Analyzed
Published: 25 Mar 2026, 10:26
Last modified:11 May 2026, 22:03

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.14% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Mar 2026, 10:26
Published
Vulnerability first disclosed
11 May 2026, 22:03
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() In mesh_rx_csa_frame(), elems->mesh_chansw_params_ie is dereferenced at lines 1638 and 1642 without a prior NULL check: ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl; ... pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value); The mesh_matches_local() check above only validates the Mesh ID, Mesh Configuration, and Supported Rates IEs. It does not verify the presence of the Mesh Channel Switch Parameters IE (element ID 118). When a received CSA action frame omits that IE, ieee802_11_parse_elems() leaves elems->mesh_chansw_params_ie as NULL, and the unconditional dereference causes a kernel NULL pointer dereference. A remote mesh peer with an established peer link (PLINK_ESTAB) can trigger this by sending a crafted SPECTRUM_MGMT/CHL_SWITCH action frame that includes a matching Mesh ID and Mesh Configuration IE but omits the Mesh Channel Switch Parameters IE. No authentication beyond the default open mesh peering is required. Crash confirmed on kernel 6.17.0-5-generic via mac80211_hwsim: BUG: kernel NULL pointer dereference, address: 0000000000000000 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:ieee80211_mesh_rx_queued_mgmt+0x143/0x2a0 [mac80211] CR2: 0000000000000000 Fix by adding a NULL check for mesh_chansw_params_ie after mesh_matches_local() returns, consistent with how other optional IEs are guarded throughout the mesh code. The bug has been present since v3.13 (released 2014-01-19).

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.14%• Percentile: 3%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • linux•linux

    ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < 753ad20dcbe36b67088c7770d8fc357d7cc43e08 | ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < f061336f072ab03fd29270ae61fede46bf8fd69d | ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < 2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab | ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < 22a9adea7e26d236406edc0ea00b54351dd56b9c | ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < f5d8af683410a8c82e48b51291915bd612523d9a | ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < cc6d5a3c0a854aeae00915fc5386570c86029c60 | ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < be8b82c567fda86f2cbb43b7208825125bb31421 | ≥ 8f2535b92d685c68db4bc699dd78462a646f6ef9, < 017c1792525064a723971f0216e6ef86a8c7af11 | 3.13

  • linux•linux kernel

    ≥ 3.13, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.77 | ≥ 6.13, < 6.18.17 | ≥ 6.19, < 6.19.7 | 7.0:rc1

References (8)