CVE-2026-23279

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-03-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

March 25, 2026

Last Modified

June 17, 2026

Advisory Details (8)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f5d8af683410a8c82e48b51291915bd612523d9a
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f061336f072ab03fd29270ae61fede46bf8fd69d
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cc6d5a3c0a854aeae00915fc5386570c86029c60
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/be8b82c567fda86f2cbb43b7208825125bb31421
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/753ad20dcbe36b67088c7770d8fc357d7cc43e08
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/22a9adea7e26d236406edc0ea00b54351dd56b9c
generic

wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/017c1792525064a723971f0216e6ef86a8c7af11

Vendor Advisories for CVE-2026-23279(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.253—osv
linuxKernel @ 6.1.167—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (117 versions)6.19.8-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(24)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 194 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 15:08 UTCOSV refresh
  3. 2026-09-01 13:53 UTCEPSS rescore
  4. 2026-09-01 04:39 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-26 14:46 UTCEPSS rescore
  10. 2026-08-25 13:48 UTCEPSS rescore
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-20 22:55 UTCEPSS rescore
  14. 2026-08-19 17:03 UTCEPSS rescore
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 10:26 UTCEG score recompute
  18. 2026-08-16 10:26 UTCVendor advisory
  19. 2026-08-16 10:26 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 06:45 UTCEG score recompute
  23. 2026-08-14 06:45 UTCVendor advisory
  24. 2026-08-14 06:45 UTCGHSA enrichment
  25. 2026-08-13 22:00 UTCEPSS rescore
Show 75 more
  1. 2026-08-12 21:00 UTCEG score recompute
  2. 2026-08-12 21:00 UTCVendor advisory
  3. 2026-08-12 21:00 UTCGHSA enrichment
  4. 2026-08-12 13:50 UTCEPSS rescore
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 05:28 UTCVendor advisory
  7. 2026-08-11 05:27 UTCGHSA enrichment
  8. 2026-08-10 05:54 UTCEG score recompute
  9. 2026-08-10 05:54 UTCVendor advisory
  10. 2026-08-10 05:54 UTCGHSA enrichment
  11. 2026-08-09 13:46 UTCEPSS rescore
  12. 2026-08-09 06:21 UTCEG score recompute
  13. 2026-08-09 06:21 UTCVendor advisory
  14. 2026-08-09 06:21 UTCGHSA enrichment
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-07 16:38 UTCEG score recompute
  17. 2026-08-07 16:38 UTCVendor advisory
  18. 2026-08-07 16:38 UTCGHSA enrichment
  19. 2026-08-06 13:46 UTCEPSS rescore
  20. 2026-08-06 01:06 UTCEG score recompute
  21. 2026-08-06 01:06 UTCVendor advisory
  22. 2026-08-06 01:06 UTCGHSA enrichment
  23. 2026-08-05 19:17 UTCEPSS rescore
  24. 2026-08-04 15:10 UTCEPSS rescore
  25. 2026-08-04 10:38 UTCEPSS rescore
  26. 2026-08-03 23:52 UTCEG score recompute
  27. 2026-08-03 23:52 UTCVendor advisory
  28. 2026-08-03 23:52 UTCGHSA enrichment
  29. 2026-08-03 10:35 UTCEPSS rescore
  30. 2026-08-02 15:40 UTCEG score recompute
  31. 2026-08-02 15:40 UTCVendor advisory
  32. 2026-08-02 15:40 UTCGHSA enrichment
  33. 2026-08-02 02:26 UTCEPSS rescore
  34. 2026-08-01 04:15 UTCEPSS rescore
  35. 2026-07-30 01:30 UTCEPSS rescore
  36. 2026-07-27 14:13 UTCEPSS rescore
  37. 2026-07-26 14:54 UTCEPSS rescore
  38. 2026-07-26 14:54 UTCEPSS rescore
  39. 2026-07-25 14:17 UTCEPSS rescore
  40. 2026-07-25 14:17 UTCEPSS rescore
  41. 2026-07-24 14:17 UTCEPSS rescore
  42. 2026-07-23 14:18 UTCEPSS rescore
  43. 2026-07-23 14:18 UTCEPSS rescore
  44. 2026-07-23 03:06 UTCEG score recompute
  45. 2026-07-22 14:08 UTCEPSS rescore
  46. 2026-07-21 15:24 UTCEPSS rescore
  47. 2026-07-21 15:24 UTCEPSS rescore
  48. 2026-07-20 17:08 UTCEPSS rescore
  49. 2026-07-19 14:31 UTCEPSS rescore
  50. 2026-07-19 14:31 UTCEPSS rescore
  51. 2026-07-18 10:04 UTCEPSS rescore
  52. 2026-07-18 10:04 UTCEPSS rescore
  53. 2026-07-17 07:16 UTCOSV refresh
  54. 2026-07-16 17:03 UTCEPSS rescore
  55. 2026-07-16 17:03 UTCEPSS rescore
  56. 2026-07-15 16:57 UTCEPSS rescore
  57. 2026-07-15 16:57 UTCEPSS rescore
  58. 2026-07-15 02:00 UTCEPSS rescore
  59. 2026-07-15 02:00 UTCEPSS rescore
  60. 2026-07-13 22:30 UTCEPSS rescore
  61. 2026-07-13 06:13 UTCEPSS rescore
  62. 2026-07-13 06:13 UTCEPSS rescore
  63. 2026-07-12 05:46 UTCEPSS rescore
  64. 2026-07-12 05:46 UTCEPSS rescore
  65. 2026-07-11 08:27 UTCEPSS rescore
  66. 2026-07-09 19:10 UTCEPSS rescore
  67. 2026-07-08 15:15 UTCEPSS rescore
  68. 2026-07-08 15:15 UTCEPSS rescore
  69. 2026-07-07 13:46 UTCEPSS rescore
  70. 2026-07-06 02:23 UTCEPSS rescore
  71. 2026-07-06 02:23 UTCEPSS rescore
  72. 2026-07-05 02:30 UTCEPSS rescore
  73. 2026-07-04 06:31 UTCEPSS rescore
  74. 2026-07-04 06:31 UTCEPSS rescore
  75. 2026-07-01 15:06 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-23279?
CVE-2026-23279 is a medium vulnerability published on March 25, 2026. In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix NULL pointer dereference in meshrxcsa_frame() In meshrxcsaframe(), elems->meshchanswparamsie is dereferenced at lines 1638 and 1642 without a prior NULL check: ifmsh->chswttl =…
When was CVE-2026-23279 disclosed?
CVE-2026-23279 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23279 actively exploited?
CVE-2026-23279 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.7% of all scored CVEs.
What is the CVSS score of CVE-2026-23279?
CVE-2026-23279 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23279?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23279, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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