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CVE-2026-23279

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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).

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in 753ad20dcbe36b67088c7770d8fc357d7cc43e08; From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in f061336f072ab03fd29270ae61fede46bf8fd69d; From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in 2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab; From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in 22a9adea7e26d236406edc0ea00b54351dd56b9c; From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in f5d8af683410a8c82e48b51291915bd612523d9a; From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in cc6d5a3c0a854aeae00915fc5386570c86029c60; From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in be8b82c567fda86f2cbb43b7208825125bb31421; From 8f2535b92d685c68db4bc699dd78462a646f6ef9 · fixed in 017c1792525064a723971f0216e6ef86a8c7af11

  • Linux Linux

    3.13

  • KernelLinux

    From 3.13.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.77; From 6.13.0 · fixed in 6.18.17; From 6.19.0 · fixed in 6.19.7

References 8

git.kernel.org