NULL Pointer Dereference Affecting kernel-docs-html package, versions <6.12.0-160000.33.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES1600-KERNELDOCSHTML-17124693
- published2 Jun 2026
- disclosed28 May 2026
Introduced: 28 May 2026
NewCVE-2026-23279 (opens in a new tab)How to fix?
Upgrade SLES:16.0.0 kernel-docs-html to version 6.12.0-160000.33.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-docs-html package and not the kernel-docs-html package as distributed by SLES.
See How to fix? for SLES:16.0.0 relevant fixed versions and status.
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).
References
- https://www.suse.com/security/cve/CVE-2026-23279.html
- https://bugzilla.suse.com/1260468
- https://git.kernel.org/stable/c/017c1792525064a723971f0216e6ef86a8c7af11
- https://git.kernel.org/stable/c/22a9adea7e26d236406edc0ea00b54351dd56b9c
- https://git.kernel.org/stable/c/2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab
- https://git.kernel.org/stable/c/753ad20dcbe36b67088c7770d8fc357d7cc43e08
- https://git.kernel.org/stable/c/be8b82c567fda86f2cbb43b7208825125bb31421
- https://git.kernel.org/stable/c/cc6d5a3c0a854aeae00915fc5386570c86029c60
- https://git.kernel.org/stable/c/f061336f072ab03fd29270ae61fede46bf8fd69d
- https://git.kernel.org/stable/c/f5d8af683410a8c82e48b51291915bd612523d9a