CVE-2026-43172 (GCVE-0-2026-43172)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-08-05 12:26
VLAI
Title
wifi: iwlwifi: fix 22000 series SMEM parsing
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: fix 22000 series SMEM parsing If the firmware were to report three LMACs (which doesn't exist in hardware) then using "fwrt->smem_cfg.lmac[2]" is an overrun of the array. Reject such and use IWL_FW_CHECK instead of WARN_ON in this function.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424 , < 1d49a42717bdc8de77eabeb5b7d3e88d141ffea9 (git)
Affected: ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424 , < 2b4b1510aaaf5b9fb57327ecffc20c055f61f205 (git)
Affected: ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424 , < 58192b9ce09b0f0f86e2036683bd542130b91a98 (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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              "value": "AV:A - The vulnerable path is in the Wi-Fi device/firmware control path during iwlwifi start/restart when the host parses a firmware-supplied SHARED_MEM_CFG_CMD response, not a routed IP service. For the affected Wi-Fi subsystem, the highest reasonable external exposure is an adjacent wireless attacker able to drive malicious firmware/device behavior.\nAC:L - There is no race or complex state requirement once a malformed response is supplied. Setting lmac_num to 3 deterministically reaches the out-of-bounds write in the 22000-series parser.\nPR:N - The malformed firmware response is parsed by the kernel driver without OS credential checks and before any Wi-Fi peer authentication boundary matters. In the adjacent attacker model, no local account or kernel privilege is required.\nUI:N - The parser runs automatically during normal Wi-Fi device start or restart. Exploitation does not require a victim to open a file, mount anything, or perform a special action.\nS:U - The corruption affects host kernel iwlwifi driver state within the same kernel security authority. It does not inherently cross a VM, IOMMU, or separate authorization boundary.\nC:H - The bug is an attacker-controlled out-of-bounds write past fwrt-\u003esmem_cfg.lmac into adjacent iwl_fw_runtime state. Kernel memory corruption is reasonably leverageable for high confidentiality impact.\nI:H - Firmware-controlled 32-bit values are written beyond the two-element LMAC array into adjacent kernel driver fields. This is an out-of-bounds write with potential for arbitrary kernel state modification or control-flow influence.\nA:H - Even without full exploitation, corrupting adjacent iwlwifi runtime/debug/workqueue state can crash or destabilize the kernel. Kernel oops, panic, or persistent Wi-Fi driver failure constitutes high availability impact."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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