wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame()
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 me
CVE-2026-23279
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23279
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "753ad20dcbe36b67088c7770d8fc357d7cc43e08",
"versionType": "git"
},
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "f061336f072ab03fd29270ae61fede46bf8fd69d",
"versionType": "git"
},
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab",
"versionType": "git"
},
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "22a9adea7e26d236406edc0ea00b54351dd56b9c",
"versionType": "git"
},
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "f5d8af683410a8c82e48b51291915bd612523d9a",
"versionType": "git"
},
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "cc6d5a3c0a854aeae00915fc5386570c86029c60",
"versionType": "git"
},
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "be8b82c567fda86f2cbb43b7208825125bb31421",
"versionType": "git"
},
{
"status": "affected",
"version": "8f2535b92d685c68db4bc699dd78462a646f6ef9",
"lessThan": "017c1792525064a723971f0216e6ef86a8c7af11",
"versionType": "git"
}
],
"programFiles": [
"net/mac80211/mesh.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.77",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.17",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mac80211/mesh.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23279
Source reference:
/cveMetadata/cveId
Publisher severity
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- Event
- #27210 · Revision 1
- Added to Heist Feed
- Publisher date