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CVE-2026-72380: Linux

8.8

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 от съседна мрежа, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: xen/pvcalls: bound backend response req_id before indexing rsp[] pvcalls_front_event_handler() takes req_id directly from the backend-supplied ring response and uses it to index the fixed-size bedata->rsp[] array for a memcpy() and a store, with no range check. A malicious or buggy backend can set req_id past PVCALLS_NR_RSP_PER_RING and drive an out-of-bounds write past the bedata allocation. req_id was also declared int while the wire field rsp->req_id is u32, so a range check on the signed value alone is insufficient: a backend req_id of 0xffffffff becomes -1, passes a >= PVCALLS_NR_RSP_PER_RING test and indexes bedata->rsp[-1]. Declare req_id as u32 so a single bound covers both ends. A backend that sends an out-of-range req_id has violated the wire protocol, so rather than silently dropping the response, log once and stop trusting the backend: set bedata->disabled. The event handler then ignores further responses, and the request paths that wait for a response return -EIO instead of blocking forever. This mirrors the fatal-error handling xen-netback uses (xenvif_fatal_tx_err()). The pvcalls frontend currently trusts its backend, so this is not a classic-Xen security issue, but it matters for hardening PV frontends against malicious backends (confidential and disaggregated deployments).

    Засегнати продукти

    • Linux Linux: 2195046bfd69e487d9a76dc47840f15c8412840c преди 4aaf7f32f1569e2c0475e073b8d7ec63b231d4c6; 2195046bfd69e487d9a76dc47840f15c8412840c преди 72e27ef70a20298e60a1de438f3628c515dea895; 2195046bfd69e487d9a76dc47840f15c8412840c преди ede7a60b046d8b7288651c55198574ed7c259da7; 2195046bfd69e487d9a76dc47840f15c8412840c преди bc8f2d1c6f7cf6e6551c00eb582baf4b52a04794; 2195046bfd69e487d9a76dc47840f15c8412840c преди d1297a9e2fd6ce08678b370d41bc980ca798f809; 2195046bfd69e487d9a76dc47840f15c8412840c преди d33846c8dcc06b83b7acdeac1e8bfbb5c0c26cb2
    • Linux Linux: 4.15; преди 4.15; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.57 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-72380: Linux | freedomonline.bg