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CVE-2026-80799

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 7.2.1, 6.1.185, <=6.1.*, 7.1.11, <=6.12.*, 1deacb5e031e289ca5636f2db4fcae6612c05d34, <2d239590d1845a706304833d40dd6d4fec20ad88, 5.4.251, 6.12.106, 0, 5.10.267, 0be9de2ea01e8d52646e7310a7eef5459cf07ea8, <=7.1.*, 6.6.154, <382eaa770335acf4f16a5a55524500f2bb4207df, <7f6f3d087c67a4346189ef2c36481455bbc59a74, <4.20, <=5.10.*, <=6.6.*, 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0, <9c47d667963542c3cf8e3007b7f10c0904d08238, <875285a165fd3b402de2ab3be0deb355d6f4caf5, <5.15, <e84cdfdc4a6c88e8b751144458f2e04e24415a28, <a209334ed929941b20810c17c3a507445b0a7c85, <78b20c8eeacd2e44a2d8a4cb5316d3c521d90911, <2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1, <5.5, 5.15, <=6.18.*, 6.18.47, <=7.2.*, 66a1be74230bbe098e651766c9a0cf4038db8442, <=*, <5.10.267, <=5.15.*, 4.19.291, 5.10.188, 5.15.218, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain three related bugs in their TLV parsing loops: 1. 'offset' is declared u8 but tlv_array_len is u16. When TLV data advances offset past 255 it silently wraps to zero, causing infinite loops or double-processing of buffer data. 2. Before reading tlv[0] (type) and tlv[1] (length) there is no check that offset+2 <= tlv_array_len. A truncated TLV causes an OOB read of one byte past the buffer end. 3. After reading the length field, the value bytes are accessed without checking offset+2+length <= tlv_array_len. A crafted length=0xFF on a short buffer causes up to 255 bytes of OOB read past the buffer end. Both functions are reachable without authentication via nfc_llcp_set_remote_gb() which feeds remote LLCP general bytes directly into nfc_llcp_parse_gb_tlv() with no additional validation. Fix all three issues by widening offset from u8 to u16 and adding bounds checks for both the TLV header and value field before each access.

Gravité et risque d'exploitation

CVE-2026-80799 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.23 %, ce qui la place devant 13.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 7.2.1, 6.1.185, <=6.1.*, 7.1.11, <=6.12.*, 1deacb5e031e289ca5636f2db4fcae6612c05d34, <2d239590d1845a706304833d40dd6d4fec20ad88, 5.4.251, 6.12.106, 0, 5.10.267, 0be9de2ea01e8d52646e7310a7eef5459cf07ea8, <=7.1.*, 6.6.154, <382eaa770335acf4f16a5a55524500f2bb4207df, <7f6f3d087c67a4346189ef2c36481455bbc59a74, <4.20, <=5.10.*, <=6.6.*, 3df40eb3a2ea58bf404a38f15a7a2768e4762cb0, <9c47d667963542c3cf8e3007b7f10c0904d08238, <875285a165fd3b402de2ab3be0deb355d6f4caf5, <5.15, <e84cdfdc4a6c88e8b751144458f2e04e24415a28, <a209334ed929941b20810c17c3a507445b0a7c85, <78b20c8eeacd2e44a2d8a4cb5316d3c521d90911, <2c1456fe09ab1a5a9fe1d8339ca6d509589b56e1, <5.5, 5.15, <=6.18.*, 6.18.47, <=7.2.*, 66a1be74230bbe098e651766c9a0cf4038db8442, <=*, <5.10.267, <=5.15.*, 4.19.291, 5.10.188, 5.15.218, 7.3) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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