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CVE-2026-53176

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.8%
Linux•Linux•Versions : <=6.1.*, <=7.0.*, <=6.12.*, 6.12.94, 0, <df422fd273c96c2ee5beb80fc21adc8c70c29260, 6.1.176, b8d26b3be8b33682cf163274ed07479a70554633, <c1234229399f4af12c553b1b0ffd978eeba65548, 5.15.210, <3.10, <=5.10.*, <=6.6.*, 7.0.13, <29e7b925ae6df64894e82ab6419994dc25580a8a, <bd22740d7f14cb1c0289444cfd2c8d2938667c1d, 6.18.36, <75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb, 7.1, <=6.18.*, <1ca40b243277c9e88be5e00bd3e083f71aefb93e, <=*, <=5.15.*, 3.10, 6.6.143, <e8a013c0c3ca2f6708341a56612a3f6d6921620a, <c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47, 5.10.259

Description

In the Linux kernel, the following vulnerability has been resolved: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN In drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done() computes the login request payload length as wc->byte_len minus ISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int. A remote iSER initiator can post a login Send work request carrying fewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows and login_req_len becomes negative. isert_rx_login_req() then reads that negative length back into a signed int, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the min() is signed it keeps the negative value; the value is then passed as the memcpy() length and sign-extended to a multi-gigabyte size_t. The copy into the 8192-byte login->req_buf runs far out of bounds and faults, crashing the target node. The login phase precedes iSCSI authentication, so no credentials are required to reach this path. Reject any login PDU shorter than ISER_HEADERS_LEN before the subtraction, mirroring the existing early return on a failed work completion, so login_req_len can never go negative. The upper bound was already safe: a posted login buffer cannot deliver more than ISER_RX_PAYLOAD_SIZE, so the difference stays at or below MAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing lower bound needs to be added.

Gravité et risque d'exploitation

CVE-2026-53176 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 0.76 %, ce qui la place devant 54.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <=6.12.*, 6.12.94, 0, <df422fd273c96c2ee5beb80fc21adc8c70c29260, 6.1.176, b8d26b3be8b33682cf163274ed07479a70554633, <c1234229399f4af12c553b1b0ffd978eeba65548, 5.15.210, <3.10, <=5.10.*, <=6.6.*, 7.0.13, <29e7b925ae6df64894e82ab6419994dc25580a8a, <bd22740d7f14cb1c0289444cfd2c8d2938667c1d, 6.18.36, <75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb, 7.1, <=6.18.*, <1ca40b243277c9e88be5e00bd3e083f71aefb93e, <=*, <=5.15.*, 3.10, 6.6.143, <e8a013c0c3ca2f6708341a56612a3f6d6921620a, <c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47, 5.10.259) 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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