Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: can: isotp: fix tx.buf use-after-free in isotp_sendmsg() isotp_sendmsg() uses only cmpxchg() on so->tx.state to serialize access to so->tx.buf. isotp_release() waits for ISOTP_IDLE via wait_event_interruptible() and then calls kfree(so->tx.buf). If a signal interrupts the wait_event_interruptible() inside close() while tx.state is ISOTP_SENDING, the loop exits early and release proceeds to force ISOTP_SHUTDOWN and continues to kfree(so->tx.buf) while sendmsg may still be reading so->tx.buf for the final CAN frame in isotp_fill_dataframe(). The so->tx.buf can be allocated once when the standard tx.buf length needs to be extended. Move the kfree() of this potentially extended tx.buf to sk_destruct time when either isotp_sendmsg() and isotp_release() are done.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 96d1c81e6a0478535342dff6c730adb076cd84e8 before cb3d6efa78460e6d50bf68806d0db66265709f64; affected 96d1c81e6a0478535342dff6c730adb076cd84e8 before 9649d051e54413049c009638ec1dc23962c884a4; affected 96d1c81e6a0478535342dff6c730adb076cd84e8 before eec8a1b18a79600bd4419079dc0026c1db72a830; affected 96d1c81e6a0478535342dff6c730adb076cd84e8 before 2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c; affected 96d1c81e6a0478535342dff6c730adb076cd84e8 before 424e95d62110cdbc8fd12b40918f37e408e35a92 |
| Linux / Linux | affected 6.4; unaffected 0 before 6.4; unaffected 6.6.131 through 6.6.*; unaffected 6.12.80 through 6.12.*; unaffected 6.18.21 through 6.18.*; unaffected 6.19.11 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/cb3d6efa78460e6d50bf68806d0db66265709f64
- https://git.kernel.org/stable/c/9649d051e54413049c009638ec1dc23962c884a4
- https://git.kernel.org/stable/c/eec8a1b18a79600bd4419079dc0026c1db72a830
- https://git.kernel.org/stable/c/2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c
- https://git.kernel.org/stable/c/424e95d62110cdbc8fd12b40918f37e408e35a92
ADP enrichment
A flaw was found in the Linux kernel's Controller Area Network (CAN) ISO-TP (isotp) module. This vulnerability, known as a use-after-free, occurs when the system attempts to free a memory region while it is still being used. A local attacker could trigger this condition by sending a signal that interrupts a specific waiting process during a close operation. This can lead to memory corruption, potentially causing the system to crash (denial of service) or behave unpredictably.
- https://access.redhat.com/security/cve/CVE-2026-31474
- https://bugzilla.redhat.com/show_bug.cgi?id=2460646
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31474.json
- https://access.redhat.com/errata/RHSA-2026:27731
- https://access.redhat.com/errata/RHSA-2026:27288
- https://access.redhat.com/errata/RHSA-2026:27789
No English description supplied.
No references supplied.