{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31411",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31411"
  ],
  "published": "2026-04-08T13:06:26Z",
  "summary": "net: atm: fix crash due to unvalidated vcc pointer in sigd_send()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atm: fix crash due to unvalidated vcc pointer in sigd_send()\n\nReproducer available at [1].\n\nThe ATM send path (sendmsg -> vcc_sendmsg -> sigd_send) reads the vcc\npointer from msg->vcc and uses it directly without any validation. This\npointer comes from userspace via sendmsg() and can be arbitrarily forged:\n\n    int fd = socket(AF_ATMSVC, SOCK_DGRAM, 0);\n    ioctl(fd, ATMSIGD_CTRL);  // become ATM signaling daemon\n    struct msghdr msg = { .msg_iov = &iov, ... };\n    *(unsigned long *)(buf + 4) = 0xdeadbeef;  // fake vcc pointer\n    sendmsg(fd, &msg, 0);  // kernel dereferences 0xdeadbeef\n\nIn normal operation, the kernel sends the vcc pointer to the signaling\ndaemon via sigd_enq() when processing operations like connect(), bind(),\nor listen(). The daemon is expected to return the same pointer when\nresponding. However, a malicious daemon can send arbitrary pointer values.\n\nFix this by introducing find_get_vcc() which validates the pointer by\nsearching through vcc_hash (similar to how sigd_close() iterates over\nall VCCs), and acquires a reference via sock_hold() if found.\n\nSince struct atm_vcc embeds struct sock as its first member, they share\nthe same lifetime. Therefore using sock_hold/sock_put is sufficient to\nkeep the vcc alive while it is being used.\n\nNote that there may be a race with sigd_close() which could mark the vcc\nwith various flags (e.g., ATM_VF_RELEASED) after find_get_vcc() returns.\nHowever, sock_hold() guarantees the memory remains valid, so this race\nonly affects the logical state, not memory safety.\n\n[1]: https://gist.github.com/mrpre/1ba5949c45529c511152e2f4c755b0f3",
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