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CVE-2026-64113

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.5%
Linux•Linux•Versions : <=6.1.*, <=7.0.*, <=6.12.*, 3.19, 0, <5d49b568c188dc77199d8d2b959c91da8cc27cf1, 5.15.209, 6.12.92, 6.6.142, <=5.10.*, <=6.6.*, 6.1.175, bad17234ba702a50aeec50ab04724ee58af89607, <e8768bcbe5cd30c4ea36a22022c9ffaa66903693, 6.18.34, <add70e2682c0ad3be2a5810bcf1bc13963ba4df9, <dfef79e09ed2f5df975c98547f97f5d7f8982a24, <a244395d8c563ed1bb26c3ef708db6aeeaa08084, 7.1, <=6.18.*, 7.0.11, 5.10.258, <6ef30384a50a50e4a484cddf341bc27de31aa3de, <55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1, <=*, <=5.15.*, <3.19, <3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb

Description

In the Linux kernel, the following vulnerability has been resolved: ixgbevf: fix use-after-free in VEPA multicast source pruning ixgbevf_clean_rx_irq() prunes frames whose source MAC matches the VF's own address (VEPA multicast workaround) by freeing the skb and continuing to the next descriptor: dev_kfree_skb_irq(skb); continue; The skb pointer is declared outside the while loop and persists across iterations. Because the continue skips the "skb = NULL" reset at the bottom of the loop, the next iteration enters the "else if (skb)" path and calls ixgbevf_add_rx_frag() on the freed skb, dereferencing skb_shinfo(skb)->nr_frags - a use-after-free in NAPI softirq context. The sibling driver iavf already handles this correctly by nulling the pointer before continuing. Apply the same pattern here. I do not have ixgbevf hardware; the bug was found by static analysis (scan_drop_continue_loops.py + semgrep drop_continue_in_loop, multi-tool corroboration with the highest score in the scan). The UAF was confirmed under KASAN by loading a test module that reproduces the exact code pattern (alloc skb, kfree_skb, then read skb_shinfo(skb)->nr_frags): BUG: KASAN: slab-use-after-free in ixgbevf_uaf_test_init+0x100/0x1000 Read of size 8 at addr 000000006163ae78 by task insmod/30 freed 208-byte region [000000006163adc0, 000000006163ae90) QEMU emulates igb (82576) but not ixgbe (82599), and the igbvf VF driver does not include the VEPA source pruning path, so a full end-to-end reproduction with emulated hardware was not possible.

Gravité et risque d'exploitation

CVE-2026-64113 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.53 %, ce qui la place devant 43.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <=6.12.*, 3.19, 0, <5d49b568c188dc77199d8d2b959c91da8cc27cf1, 5.15.209, 6.12.92, 6.6.142, <=5.10.*, <=6.6.*, 6.1.175, bad17234ba702a50aeec50ab04724ee58af89607, <e8768bcbe5cd30c4ea36a22022c9ffaa66903693, 6.18.34, <add70e2682c0ad3be2a5810bcf1bc13963ba4df9, <dfef79e09ed2f5df975c98547f97f5d7f8982a24, <a244395d8c563ed1bb26c3ef708db6aeeaa08084, 7.1, <=6.18.*, 7.0.11, 5.10.258, <6ef30384a50a50e4a484cddf341bc27de31aa3de, <55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1, <=*, <=5.15.*, <3.19, <3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb) 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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