CVE-2026-63797
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().
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.15%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.4 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.15% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/104d100212396801f1d9d388282f746e23e2bfd6Patch
- https://git.kernel.org/stable/c/1306fc4f76f765727a6d5aefbf08ef0c8f32996fPatch
- https://git.kernel.org/stable/c/1ff3f528e67d20e2b1483dcaba899dc7832b2e6bPatch
- https://git.kernel.org/stable/c/c5ebb06c7e24d531b68707168e04698859d642bcPatch
- https://git.kernel.org/stable/c/ddf13f91ca82c94ef7ad9c41a434a03313f8eb1bPatch
- https://git.kernel.org/stable/c/ff268cd9ccbce6472a0658791b417bf11c31ee39Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.