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CVE-2026-43450

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <92441f6d9405a0c18d03f278b395e782f79a4a30, <=6.12.*, 6.12.78, <4a1f6ee69267a5f524102c028981410eeacfa3da, 0, 7.0, 12f7a505331e6b2754684b509f2ac8f0011ce644, <3.6, 6.18.19, <=5.10.*, <=6.6.*, 3.6, <=6.19.*, <894c5780ddadd5fde0e16f66587918e6be1504c4, <05018cd9370f77bb18fbf6e15ff33c7a06f10b3c, 5.15.203, 6.19.9, <=6.18.*, <0605e1985a95d4334a67869aee45a47e82301abf, <6dcee8496d53165b2d8a5909b3050b62ae71fe89, 6.1.167, <61b3a1f8621df1a5928118313f133996f6a786db, <=*, 5.10.253, <=5.15.*, <3cc328ffc32ddb389cba7b78b6aa95d995c2876e, 6.6.130

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() nfnl_cthelper_dump_table() has a 'goto restart' that jumps to a label inside the for loop body. When the "last" helper saved in cb->args[1] is deleted between dump rounds, every entry fails the (cur != last) check, so cb->args[1] is never cleared. The for loop finishes with cb->args[0] == nf_ct_helper_hsize, and the 'goto restart' jumps back into the loop body bypassing the bounds check, causing an 8-byte out-of-bounds read on nf_ct_helper_hash[nf_ct_helper_hsize]. The 'goto restart' block was meant to re-traverse the current bucket when "last" is no longer found, but it was placed after the for loop instead of inside it. Move the block into the for loop body so that the restart only occurs while cb->args[0] is still within bounds. BUG: KASAN: slab-out-of-bounds in nfnl_cthelper_dump_table+0x9f/0x1b0 Read of size 8 at addr ffff888104ca3000 by task poc_cthelper/131 Call Trace: nfnl_cthelper_dump_table+0x9f/0x1b0 netlink_dump+0x333/0x880 netlink_recvmsg+0x3e2/0x4b0 sock_recvmsg+0xde/0xf0 __sys_recvfrom+0x150/0x200 __x64_sys_recvfrom+0x76/0x90 do_syscall_64+0xc3/0x6e0 Allocated by task 1: __kvmalloc_node_noprof+0x21b/0x700 nf_ct_alloc_hashtable+0x65/0xd0 nf_conntrack_helper_init+0x21/0x60 nf_conntrack_init_start+0x18d/0x300 nf_conntrack_standalone_init+0x12/0xc0

Gravité et risque d'exploitation

CVE-2026-43450 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 0.13 %, ce qui la place devant 2.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <92441f6d9405a0c18d03f278b395e782f79a4a30, <=6.12.*, 6.12.78, <4a1f6ee69267a5f524102c028981410eeacfa3da, 0, 7.0, 12f7a505331e6b2754684b509f2ac8f0011ce644, <3.6, 6.18.19, <=5.10.*, <=6.6.*, 3.6, <=6.19.*, <894c5780ddadd5fde0e16f66587918e6be1504c4, <05018cd9370f77bb18fbf6e15ff33c7a06f10b3c, 5.15.203, 6.19.9, <=6.18.*, <0605e1985a95d4334a67869aee45a47e82301abf, <6dcee8496d53165b2d8a5909b3050b62ae71fe89, 6.1.167, <61b3a1f8621df1a5928118313f133996f6a786db, <=*, 5.10.253, <=5.15.*, <3cc328ffc32ddb389cba7b78b6aa95d995c2876e, 6.6.130) 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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