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CVE-2026-98123

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <4548d843e7b29f6d150d8caae4e64015fa226b0c, <=6.1.*, <=6.12.*, 7.2.7, 2.6.12, <7ba84e2971d208a2d6413a334ec28a8a32cdce0f, 6.18.53, 0, <2cb0b0b1ed69430bf73740377ea0a1c44c50db63, <ba54cad229977f4fae6355dbdaf117088414fdd0, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <7d8e7ab6a0665888beee91f7ad77ac805963c4fd, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, 6.1.189, <=6.18.*, 5.15.222, 7.3, <=7.2.*, <5fbc6a778d5fce7628821236972596acb18e1065, <=*, <=5.15.*, <3be02999ab9131a4b96eb1eda4ca48b1cea80f03, 6.12.111, <abf59d7f6fff23227256e8199aca5ade45758f8b

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: fix soft lockup from unpadded ASCONF-ACK parameter iteration sctp_verify_asconf() walks ASCONF-ACK parameters with sctp_walk_params(), which advances by SCTP_PAD4(length), while the consumer sctp_get_asconf_response() iterates the same parameters advancing by the raw length, without padding. A single odd-length parameter desynchronises the two walks and makes the consumer interpret attacker-controlled bytes at a misaligned offset. When those bytes yield a length of zero, the while loop over asconf_ack_len makes no progress, spinning forever in softirq context, and the watchdog reports a soft lockup. All reads stay within the received skb, so the lockup is a pure remote denial of service. A remote peer can trigger it with a crafted ASCONF-ACK on an ADD-IP enabled association with an outstanding ASCONF (RFC 5061 section 4.1.2 requires the chunk to be authenticated, but the predefined empty key id 0 allows the peer to compute the same association HMAC from publicly exchanged parameters, so the gate does not help). The SCTP_PARAM_ERR_CAUSE case of sctp_verify_asconf() also performs no length check, letting a parameter without a complete error header reach the consumer, which reads errhdr.cause past the end of the parameter, an out-of-bounds read. Reject SCTP_PARAM_ERR_CAUSE parameters shorter than sizeof(struct sctp_addip_param) + sizeof(struct sctp_errhdr) at the verifier, and advance the consumer iterator with the same padding rule as the verifier to keep the two walks in lockstep. The verifier change guarantees a complete error header in every ERR_CAUSE parameter the consumer can see, so the consumer's asconf_ack_len check is dropped and it returns err_param->cause directly. The consumer padding fix is still required because odd lengths remain valid for SCTP_PARAM_ERR_CAUSE per RFC 5061. The issue was found by ZeroHive, a vulnerability hunting agent at Tencent Yunding Lab.

Gravité et risque d'exploitation

CVE-2026-98123 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 0.18 %, ce qui la place devant 6.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <4548d843e7b29f6d150d8caae4e64015fa226b0c, <=6.1.*, <=6.12.*, 7.2.7, 2.6.12, <7ba84e2971d208a2d6413a334ec28a8a32cdce0f, 6.18.53, 0, <2cb0b0b1ed69430bf73740377ea0a1c44c50db63, <ba54cad229977f4fae6355dbdaf117088414fdd0, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, <7d8e7ab6a0665888beee91f7ad77ac805963c4fd, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, 6.1.189, <=6.18.*, 5.15.222, 7.3, <=7.2.*, <5fbc6a778d5fce7628821236972596acb18e1065, <=*, <=5.15.*, <3be02999ab9131a4b96eb1eda4ca48b1cea80f03, 6.12.111, <abf59d7f6fff23227256e8199aca5ade45758f8b) 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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