can: isotp: fix tx.buf use-after-free in isotp_sendmsg()

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Summary

CVECVE-2026-31474
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:44 UTC
Updated2026-04-23 16:17:41 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.047780000 (date 2026-04-24)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 96d1c81e6a0478535342dff6c730adb076cd84e8 cb3d6efa78460e6d50bf68806d0db66265709f64 git Not specified
CNA Linux Linux affected 96d1c81e6a0478535342dff6c730adb076cd84e8 9649d051e54413049c009638ec1dc23962c884a4 git Not specified
CNA Linux Linux affected 96d1c81e6a0478535342dff6c730adb076cd84e8 eec8a1b18a79600bd4419079dc0026c1db72a830 git Not specified
CNA Linux Linux affected 96d1c81e6a0478535342dff6c730adb076cd84e8 2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c git Not specified
CNA Linux Linux affected 96d1c81e6a0478535342dff6c730adb076cd84e8 424e95d62110cdbc8fd12b40918f37e408e35a92 git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9649d051e54413049c009638ec1dc23962c884a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/424e95d62110cdbc8fd12b40918f37e408e35a92 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eec8a1b18a79600bd4419079dc0026c1db72a830 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cb3d6efa78460e6d50bf68806d0db66265709f64 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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