CVE-2026-23279wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame()
Updated under an hour ago ()
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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
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8f2535b92d685c68db4bc699dd78462a646f6ef9 before 753ad20dcbe36b67088c7770d8fc357d7cc43e08; from 8f2535b92d685c68db4bc699dd78462a646f6ef9 before f061336f072ab03fd29270ae61fede46bf8fd69d; 8f2535b92d685c68db4bc699dd78462a646f6ef9 builds before 2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab; from 8f2535b92d685c68db4bc699dd78462a646f6ef9 before 22a9adea7e26d236406edc0ea00b54351dd56b9c; from 8f2535b92d685c68db4bc699dd78462a646f6ef9 before f5d8af683410a8c82e48b51291915bd612523d9a; from 8f2535b92d685c68db4bc699dd78462a646f6ef9 before cc6d5a3c0a854aeae00915fc5386570c86029c60; from 8f2535b92d685c68db4bc699dd78462a646f6ef9 before be8b82c567fda86f2cbb43b7208825125bb31421; from 8f2535b92d685c68db4bc699dd78462a646f6ef9 before 017c1792525064a723971f0216e6ef86a8c7af11 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.13 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/753ad20dcbe36b67088c7770d8fc357d7cc43e08patch
- https://git.kernel.org/stable/c/f061336f072ab03fd29270ae61fede46bf8fd69dpatch
- https://git.kernel.org/stable/c/2b5f282b1b7241ef624c3399a1cdff0bb1a3eeabpatch
- https://git.kernel.org/stable/c/22a9adea7e26d236406edc0ea00b54351dd56b9cpatch
- https://git.kernel.org/stable/c/f5d8af683410a8c82e48b51291915bd612523d9apatch
- https://git.kernel.org/stable/c/cc6d5a3c0a854aeae00915fc5386570c86029c60patch
- https://git.kernel.org/stable/c/be8b82c567fda86f2cbb43b7208825125bb31421patch
- https://git.kernel.org/stable/c/017c1792525064a723971f0216e6ef86a8c7af11patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.