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7.8 High

CVE-2026-31474 In the Linux kernel, the following vulnerability has been resolved: can: isotp: fix tx.buf use-after-free in…

Description

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 products and versions

Product Affected versions Fixed in
Linux 7.0 earliest → < 7.0 7.0
Linux 6.19 earliest → < 6.19.11 6.19.11
Linux 6.18 earliest → < 6.18.21 6.18.21
Linux 6.12 earliest → < 6.12.80 6.12.80
Linux 6.6 earliest → < 6.6.131 6.6.131
Linux 6.4 No fix stated
Red Hat Enterprise Linux AppStream EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux AppStream (v. 10) Versions not published
Red Hat Enterprise Linux AppStream (v. 9) Versions not published
Show the 18 other branches
Product Affected versions Fixed in
Red Hat Enterprise Linux BaseOS EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux BaseOS (v. 10) Versions not published
Red Hat Enterprise Linux BaseOS (v. 9) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) Versions not published
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux Real Time for NFV (v. 10) Versions not published
Red Hat Enterprise Linux Real Time for NFV (v. 9) Versions not published
Red Hat Enterprise Linux Real Time EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux Real Time (v. 10) Versions not published
Red Hat Enterprise Linux Real Time (v. 9) Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published

References

Timeline

  1. Published
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