CVE-2026-63797

Summary

In the Linux kernel, the following vulnerability has been resolved:

rpmsg: char: Fix use-after-free on probe error path

rpmsg_chrdev_probe() stores the newly allocated eptdev in the default endpoint's priv pointer before calling rpmsg_chrdev_eptdev_add(). If rpmsg_chrdev_eptdev_add() then fails, its error path frees eptdev while the default endpoint may still dispatch callbacks with the stale priv pointer.

Avoid publishing eptdev through the default endpoint until rpmsg_chrdev_eptdev_add() succeeds. Messages received before the priv pointer is published should be ignored by rpmsg_ept_cb(). Flow-control updates can hit rpmsg_ept_flow_cb() in the same window, so make both callbacks return success when priv is NULL.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbc69d10665690492421d926b1cd9a7a36bffd691 < ddf13f91ca82c94ef7ad9c41a434a03313f8eb1baffected
LinuxLinuxbc69d10665690492421d926b1cd9a7a36bffd691 < c5ebb06c7e24d531b68707168e04698859d642bcaffected
LinuxLinuxbc69d10665690492421d926b1cd9a7a36bffd691 < 104d100212396801f1d9d388282f746e23e2bfd6affected
LinuxLinuxbc69d10665690492421d926b1cd9a7a36bffd691 < ff268cd9ccbce6472a0658791b417bf11c31ee39affected
LinuxLinuxbc69d10665690492421d926b1cd9a7a36bffd691 < 1ff3f528e67d20e2b1483dcaba899dc7832b2e6baffected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux6.6.144 <= 6.6.*unaffected
LinuxLinux6.12.95 <= 6.12.*unaffected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.1.3 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References