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CVE-2026-72251

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.7%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <eae9c6ccb5af69c713a65f8ae219f5c1aa32cd17, 0, <3.9, <=7.1.*, <57e4e29644ec054d7021d296407e7ddd844afea2, <bded21a4bf9bf86a79148be735723a97ca9a7532, 6.1.178, <=5.10.*, <2bcf2c5052fb5e73e255140ab43f056aef409c27, <=6.6.*, 6.12.97, <77e43bcb7ec177e293a5c3f1b91a2c5aebfb6c68, <=6.18.*, 5.15.212, <0e76e3e886cc9ee027337d5ad39cb96f57b7bdc7, 6.6.145, 5.10.261, 7266507d89991fa1e989283e4e032c6d9357fe26, <e38143c9b477f2968024c47c647dd4456a40aff1, <=*, <=5.15.*, <dc11f26685aa850f237226f0f463647aea58ab7c, 7.2, 3.9

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: reload possible stale data pointer quoting sashiko: ------------------------------------------------------------------------ [..] noticed a potential memory bug and header corruption involving the SIP NAT helper. In net/netfilter/nf_nat_sip.c:nf_nat_sip(): if (skb_ensure_writable(skb, skb->len)) { nf_ct_helper_log(skb, ct, "cannot mangle packet"); return NF_DROP; } uh = (void *)skb->data + protoff; uh->dest = ct_sip_info->forced_dport; if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo, protoff, 0, 0, NULL, 0)) { If a cloned or fragmented SKB is reallocated by skb_ensure_writable(), the old data buffer is freed. However, nf_nat_sip() fails to update *dptr to point to the new buffer. It also appears to use nf_nat_mangle_udp_packet() on what could be a TCP packet, which would overwrite the sequence number with a checksum update. ------------------------------------------------------------------------ nf_conntrack_sip linerizes skbs, hence no fragmented skb can be seen. But clones are possible, so rebuild dptr. Disable nf_nat_mangle_udp_packet() branch for TCP streams. It doesn't look like this can ever happen, else we should have received bug reports about this, so just check the conntrack is UDP and drop otherwise. The calling conntrack_sip set ->forced_dport for SIP_HDR_VIA_UDP messages, so I don't think this is ever expected to be true for a TCP stream.

Gravité et risque d'exploitation

CVE-2026-72251 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 0.71 %, ce qui la place devant 52.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <eae9c6ccb5af69c713a65f8ae219f5c1aa32cd17, 0, <3.9, <=7.1.*, <57e4e29644ec054d7021d296407e7ddd844afea2, <bded21a4bf9bf86a79148be735723a97ca9a7532, 6.1.178, <=5.10.*, <2bcf2c5052fb5e73e255140ab43f056aef409c27, <=6.6.*, 6.12.97, <77e43bcb7ec177e293a5c3f1b91a2c5aebfb6c68, <=6.18.*, 5.15.212, <0e76e3e886cc9ee027337d5ad39cb96f57b7bdc7, 6.6.145, 5.10.261, 7266507d89991fa1e989283e4e032c6d9357fe26, <e38143c9b477f2968024c47c647dd4456a40aff1, <=*, <=5.15.*, <dc11f26685aa850f237226f0f463647aea58ab7c, 7.2, 3.9) 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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