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CVE-2026-90067

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.5 · Élevée
EPSS 0.7%
Linux•Linux•Versions : <5.11, <=6.1.*, <=6.12.*, 5.15.221, <c77633a9595658210a6e216a071e5a396a0835a7, cd1a677cad994021b19665ed476aea63f5d54f31, 0, 5.11, 6.1.188, 6.18.52, <6cf666e47f2b51d5a887ec8a3226cde951757d27, <=6.6.*, <279c0852999fd2384f4a88155091a99e81f96873, 6.6.157, <6d1c6f228854aa89844fd0152d7ed7ac72a55e89, 7.2.6, <=6.18.*, 6.12.110, <=7.2.*, <=*, <=5.15.*, <3b2e62a7655d347a845a91155610ddae11daffc6, <f374967fcdf04001c9b66df1c19106fa83cd91f7, <c1b937ff24b19e69aa7fb1b0f46a74d4c9668692, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: validate banner payload length When parsing the Ceph messenger v2 protocol banner, the `payload_len` field is decoded from the banner prefix. If a client sends a banner with a `payload_len` of 0, the kernel sets up a 0-length socket read. This violates an invariant in the state machine, triggering a warning in `populate_in_iter()`: ------------[ cut here ]------------ !iov_iter_count(&con->v2.in_iter) WARNING: net/ceph/messenger_v2.c:3129 at populate_in_iter net/ceph/messenger_v2.c:3129 [inline], CPU#1: kworker/1:3/5070 WARNING: net/ceph/messenger_v2.c:3129 at ceph_con_v2_try_read+0x6634/0x6810 net/ceph/messenger_v2.c:3159, CPU#1: kworker/1:3/5070 ... Call Trace: <TASK> ceph_con_workfn+0x1f5/0x14a0 net/ceph/messenger.c:1575 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> According to the msgr2 protocol specification, the banner payload is expected to contain at least two 64-bit integers (`server_feat` and `server_req_feat`). Therefore, `payload_len` must be at least 16 bytes. Fix this by adding a check in `process_banner_prefix()` to reject a `payload_len` smaller than 16 bytes. This prevents the 0-length read and correctly aborts the connection with a protocol error.

Gravité et risque d'exploitation

CVE-2026-90067 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.67 %, ce qui la place devant 51.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <5.11, <=6.1.*, <=6.12.*, 5.15.221, <c77633a9595658210a6e216a071e5a396a0835a7, cd1a677cad994021b19665ed476aea63f5d54f31, 0, 5.11, 6.1.188, 6.18.52, <6cf666e47f2b51d5a887ec8a3226cde951757d27, <=6.6.*, <279c0852999fd2384f4a88155091a99e81f96873, 6.6.157, <6d1c6f228854aa89844fd0152d7ed7ac72a55e89, 7.2.6, <=6.18.*, 6.12.110, <=7.2.*, <=*, <=5.15.*, <3b2e62a7655d347a845a91155610ddae11daffc6, <f374967fcdf04001c9b66df1c19106fa83cd91f7, <c1b937ff24b19e69aa7fb1b0f46a74d4c9668692, 7.3) 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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