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CVE-2026-31411: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net: atm: fix crash due to unvalidated vcc pointer in sigd_send() Reproducer available at [1]. The ATM send path (sendmsg -> vcc_sendmsg -> sigd_send) reads the vcc pointer from msg->vcc and uses it directly without any validation. This pointer comes from userspace via sendmsg() and can be arbitrarily forged: int fd = socket(AF_ATMSVC, SOCK_DGRAM, 0); ioctl(fd, ATMSIGD_CTRL); // become ATM signaling daemon struct msghdr msg = { .msg_iov = &iov, ... }; *(unsigned long *)(buf + 4) = 0xdeadbeef; // fake vcc pointer sendmsg(fd, &msg, 0); // kernel dereferences 0xdeadbeef In normal operation, the kernel sends the vcc pointer to the signaling daemon via sigd_enq() when processing operations like connect(), bind(), or listen(). The daemon is expected to return the same pointer when responding. However, a malicious daemon can send arbitrary pointer values. Fix this by introducing find_get_vcc() which validates the pointer by searching through vcc_hash (similar to how sigd_close() iterates over all VCCs), and acquires a reference via sock_hold() if found. Since struct atm_vcc embeds struct sock as its first member, they share the same lifetime. Therefore using sock_hold/sock_put is sufficient to keep the vcc alive while it is being used. Note that there may be a race with sigd_close() which could mark the vcc with various flags (e.g., ATM_VF_RELEASED) after find_get_vcc() returns. However, sock_hold() guarantees the memory remains valid, so this race only affects the logical state, not memory safety. [1]: https://gist.github.com/mrpre/1ba5949c45529c511152e2f4c755b0f3

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди c96549d07dfdd51aadf0722cfb40711574424840; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 1c8bda3df028d5e54134077dcd09f46ca8cfceb5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 3e1a8b00095246a9a2b46b57f6d471c6d3c00ed2; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди e3f80666c2739296c3b69a127300455c43aa1067; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 21c303fec138c002f90ed33bce60e807d53072bb; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 69d3f9ee5489e6e8b66defcfa226e91d82393297; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 440c9a5fc477a8ee259d8bf669531250b8398651; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди ae88a5d2f29b69819dc7b04086734439d074a643
    • Linux Linux: 2.6.12; преди 2.6.12; 5.10.252 до 5.10.*; 5.15.202 до 5.15.*; 6.1.165 до 6.1.*; 6.6.128 до 6.6.*; 6.12.75 до 6.12.*; 6.18.14 до 6.18.*; 6.19.4 до 6.19.*; 7.0 до *
    • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *

    История

    • 8 април 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31411: Linux | freedomonline.bg