{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31474","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.098Z","datePublished":"2026-04-22T13:54:03.100Z","dateUpdated":"2026-05-11T22:09:26.119Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:09:26.119Z"},"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/isotp.c"],"versions":[{"version":"96d1c81e6a0478535342dff6c730adb076cd84e8","lessThan":"cb3d6efa78460e6d50bf68806d0db66265709f64","status":"affected","versionType":"git"},{"version":"96d1c81e6a0478535342dff6c730adb076cd84e8","lessThan":"9649d051e54413049c009638ec1dc23962c884a4","status":"affected","versionType":"git"},{"version":"96d1c81e6a0478535342dff6c730adb076cd84e8","lessThan":"eec8a1b18a79600bd4419079dc0026c1db72a830","status":"affected","versionType":"git"},{"version":"96d1c81e6a0478535342dff6c730adb076cd84e8","lessThan":"2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c","status":"affected","versionType":"git"},{"version":"96d1c81e6a0478535342dff6c730adb076cd84e8","lessThan":"424e95d62110cdbc8fd12b40918f37e408e35a92","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/isotp.c"],"versions":[{"version":"6.4","status":"affected"},{"version":"0","lessThan":"6.4","status":"unaffected","versionType":"semver"},{"version":"6.6.131","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.80","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.21","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.11","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/cb3d6efa78460e6d50bf68806d0db66265709f64"},{"url":"https://git.kernel.org/stable/c/9649d051e54413049c009638ec1dc23962c884a4"},{"url":"https://git.kernel.org/stable/c/eec8a1b18a79600bd4419079dc0026c1db72a830"},{"url":"https://git.kernel.org/stable/c/2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c"},{"url":"https://git.kernel.org/stable/c/424e95d62110cdbc8fd12b40918f37e408e35a92"}],"title":"can: isotp: fix tx.buf use-after-free in isotp_sendmsg()","x_generator":{"engine":"bippy-1.2.0"}}}}