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CVE-2026-46114: Linux, грешка в паметта

7.5

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads atomic_write_reply() at drivers/infiniband/sw/rxe/rxe_resp.c unconditionally dereferences 8 bytes at payload_addr(pkt): value = *(u64 *)payload_addr(pkt); check_rkey() previously accepted an ATOMIC_WRITE request with pktlen == resid == 0 because the length validation only compared pktlen against resid. A remote initiator that sets the RETH length to 0 therefore reaches atomic_write_reply() with a zero-byte logical payload, and the responder reads sizeof(u64) bytes from past the logical end of the packet into skb->head tailroom, then writes those 8 bytes into the attacker's MR via rxe_mr_do_atomic_write(). That is a remote disclosure of 4 bytes of kernel tailroom per probe (the other 4 bytes are the packet's own trailing ICRC). IBA oA19-28 defines ATOMIC_WRITE as exactly 8 bytes. Anything else is protocol-invalid. Hoist a strict length check into check_rkey() so the responder never reaches the unchecked dereference, and keep the existing WRITE-family length logic for the normal RDMA WRITE path. Reproduced on mainline with an unmodified rxe driver: a sustained zero-length ATOMIC_WRITE probe repeatedly leaks adjacent skb head-buffer bytes into the attacker's MR, including recognisable kernel strings and partial kernel-direct-map pointer words. With this patch applied the responder rejects the PDU and the MR stays all-zero.

Засегнати продукти

  • Linux Linux: 034e285f8b99062a0cf29112e1232154a6a44aa5 преди 539cabb7b2d8ba70f55bba91db55faef11c2a6d7; 034e285f8b99062a0cf29112e1232154a6a44aa5 преди d415fce3fcde6d7aeea6c25362a395b905811452; 034e285f8b99062a0cf29112e1232154a6a44aa5 преди 105bf79a23b85cf3a761d18a4f3e10ce88526bc1; 034e285f8b99062a0cf29112e1232154a6a44aa5 преди 7ec1ed4747f5f99f8b797bb438c5efd36079fad5; 034e285f8b99062a0cf29112e1232154a6a44aa5 преди 1114c87aa6f195cf07da55a27b2122ae26557b26
  • Linux Linux: 6.2; преди 6.2; 6.6.140 до 6.6.*; 6.12.88 до 6.12.*; 6.18.30 до 6.18.*; 7.0.7 до 7.0.*; от 7.1 нататък

Вид слабост

История

  • 28 май 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-46114: Linux, грешка в паметта | freedomonline.bg