EUVD-2026-24827
GHSA-6p7x-c5rv-9w7v
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
8DescriptionNVD
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.
AnalysisAI
Use-after-free in Linux kernel ISO-TP CAN protocol driver allows local authenticated users to read freed memory, corrupt kernel state, or execute arbitrary code with kernel privileges. Affects kernels from commit 96d1c81e to 6.6.131, 6.12.80, 6.18.21, and 6.19.11. …
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RemediationAI
Within 24 hours: Identify all systems running Linux kernels between commit 96d1c81e and versions 6.6.131, 6.12.80, 6.18.21, or 6.19.11; prioritize CAN protocol-enabled systems and those with non-privileged user access. Within 7 days: Apply vendor-released kernel patches (upgrade to 6.6.132+, 6.12.81+, 6.18.22+, or 6.19.12+ depending on your kernel branch); test patches in non-production environments first. …
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