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CVE-2026-74667

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 6.6.152, <fdd4d7d52358a58e351dd9d82530c04eba8ccd7a, <4057853a91fb796c4f47c7d1baf1aa085394148e, <b47ba8fe6e1d2df8c92048de5afafd059447dc30, 0, <2610ed4e86a4590234a9d70518c469751c5af231, <971aa7d99242bbf09513e27b7a243f0b29ff23ae, <=7.1.*, <1e43a1d66615f411d427f9df1f46dd049d9e3681, 5.15.216, <=5.10.*, <=6.6.*, 7.1.9, 6.1.183, <284f3e7a3f1a743fdf89e304fd1f19d5ffcff46d, <5.1, <=6.18.*, 6.12.104, 5.1, 6.18.45, 75c65772c3d18447d62d3aca5f91b06c16cc25e4, <=*, <=5.15.*, <c2707480cfbf19c7619acc9c089d17f20869821f, 5.10.265, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: net/packet: reset the MAC header on the packet-socket transmit path packet_parse_headers() resets the MAC header only for a SOCK_RAW frame whose socket did not bind a protocol. A protocol-bound SOCK_RAW socket, any SOCK_DGRAM frame, and the legacy SOCK_PACKET path therefore leave skb->mac_header unset here. For frames sent via __dev_queue_xmit() this is harmless: it resets the MAC header unconditionally. But the packet-socket PACKET_QDISC_BYPASS path uses dev_direct_xmit(), which does not, so the frame reaches ndo_start_xmit() with the MAC header unset. A driver that reads eth_hdr(skb) on transmit then dereferences skb->head + (u16)~0, an out-of-bounds access ~64 KiB past the head -- the same class fixed for one consumer in commit f5089008f90c ("macsec: do not read an unset MAC header in macsec_encrypt()"). packet_parse_headers() runs only on the transmit path, where skb->data points at the start of the L2 header for every packet-socket type regardless of its length: SOCK_RAW and SOCK_PACKET carry a user-supplied header and SOCK_DGRAM has one built by dev_hard_header(). Reset the MAC header unconditionally, mirroring __dev_queue_xmit(), so the frame is anchored on the bypass path too. Found by 0sec (https://0sec.ai) using automated source analysis; verified against source and matched to the macsec KASAN report in f5089008f90c. Compile-tested.

Gravité et risque d'exploitation

CVE-2026-74667 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.14 %, ce qui la place devant 2.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 6.6.152, <fdd4d7d52358a58e351dd9d82530c04eba8ccd7a, <4057853a91fb796c4f47c7d1baf1aa085394148e, <b47ba8fe6e1d2df8c92048de5afafd059447dc30, 0, <2610ed4e86a4590234a9d70518c469751c5af231, <971aa7d99242bbf09513e27b7a243f0b29ff23ae, <=7.1.*, <1e43a1d66615f411d427f9df1f46dd049d9e3681, 5.15.216, <=5.10.*, <=6.6.*, 7.1.9, 6.1.183, <284f3e7a3f1a743fdf89e304fd1f19d5ffcff46d, <5.1, <=6.18.*, 6.12.104, 5.1, 6.18.45, 75c65772c3d18447d62d3aca5f91b06c16cc25e4, <=*, <=5.15.*, <c2707480cfbf19c7619acc9c089d17f20869821f, 5.10.265, 7.2) 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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