Answer in brief
CVE-2026-23279 records a Unknown severity vulnerability in wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <753ad20dcbe36b67088c7770d8fc357d7cc43e08 || >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <f061336f072ab03fd29270ae61fede46bf8fd69d || >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab || >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <22a9adea7e26d236406edc0ea00b54351dd56b9c || >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <f5d8af683410a8c82e48b51291915bd612523d9a || >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <cc6d5a3c0a854aeae00915fc5386570c86029c60 || >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <be8b82c567fda86f2cbb43b7208825125bb31421 || >=8f2535b92d685c68db4bc699dd78462a646f6ef9 <017c1792525064a723971f0216e6ef86a8c7af11 | 753ad20dcbe36b67088c7770d8fc357d7cc43e08, f061336f072ab03fd29270ae61fede46bf8fd69d, 2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab, 22a9adea7e26d236406edc0ea00b54351dd56b9c, f5d8af683410a8c82e48b51291915bd612523d9a, cc6d5a3c0a854aeae00915fc5386570c86029c60, be8b82c567fda86f2cbb43b7208825125bb31421, 017c1792525064a723971f0216e6ef86a8c7af11 |
| Linux/Linuxgeneric | 3.13 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Mar 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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).
Quoted source text, attributed separately from HOL analysis.