{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31474",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31474"
  ],
  "published": "2026-04-22T13:57:42Z",
  "summary": "can: isotp: fix tx.buf use-after-free in isotp_sendmsg()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix tx.buf use-after-free in isotp_sendmsg()\n\nisotp_sendmsg() uses only cmpxchg() on so->tx.state to serialize access\nto so->tx.buf. isotp_release() waits for ISOTP_IDLE via\nwait_event_interruptible() and then calls kfree(so->tx.buf).\n\nIf a signal interrupts the wait_event_interruptible() inside close()\nwhile tx.state is ISOTP_SENDING, the loop exits early and release\nproceeds to force ISOTP_SHUTDOWN and continues to kfree(so->tx.buf)\nwhile sendmsg may still be reading so->tx.buf for the final CAN frame\nin isotp_fill_dataframe().\n\nThe so->tx.buf can be allocated once when the standard tx.buf length needs\nto be extended. Move the kfree() of this potentially extended tx.buf to\nsk_destruct time when either isotp_sendmsg() and isotp_release() are done.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31474"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cb3d6efa78460e6d50bf68806d0db66265709f64"
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      "url": "https://git.kernel.org/stable/c/9649d051e54413049c009638ec1dc23962c884a4"
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      "url": "https://git.kernel.org/stable/c/eec8a1b18a79600bd4419079dc0026c1db72a830"
    },
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    },
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable ISO-TP transmit path is reached through local socket syscalls such as socket/bind/sendmsg/close on an AF_CAN CAN_ISOTP socket. A CAN peer may influence flow control, but the bug requires a local process to create the socket, send the PDU, and interrupt close.\nAC:L - Once ISO-TP extended PDU buffers are available, the attacker controls the socket options, message size, close operation, and signal timing needed to hit the close-vs-transmit race. The race is between attacker-controlled local operations and in-kernel asynchronous transmit completion, so no uncontrollable external condition is required.\nPR:L - The AF_CAN CAN_ISOTP socket create, bind, setsockopt, sendmsg, and release paths do not impose a CAP_NET_ADMIN check. An unprivileged local user can reach the vulnerable code on a system with an available CAN interface or equivalent namespace/preconfigured CAN setup.\nUI:N - No victim action is needed once the attacker can run local code. The attacker can drive the send, close, and signal sequence directly.\nS:U - The issue is a kernel memory lifetime bug in the same operating-system security authority. It does not cross a VM, IOMMU, or separate sandbox boundary by itself.\nC:H - The freed tx.buf can be reused while the ISO-TP transmit path later reads from it into outgoing CAN frames, creating a kernel heap use-after-free information disclosure primitive. Under conservative kernel UAF scoring, this supports high confidentiality impact.\nI:H - This is kernel heap use-after-free memory corruption reachable by attacker-controlled timing and heap grooming. Following the required conservative UAF guidance, it is treated as potentially exploitable for high integrity impact.\nA:H - The stale freed buffer can be dereferenced asynchronously during frame construction after release, which can trigger kernel memory corruption symptoms including oops or panic. Repeated local triggering can therefore cause high availability impact."
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}