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Review reviewHigh

CVE-2026-63797

Linux Linux, linux kernel

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()....

CVSS
8.4
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.4

Vulnerability overview

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()....

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= bc69d10665690492421d926b1cd9a7a36bffd691 < 1306fc4f76f765727a6d5aefbf08ef0c8f32996f, >= bc69d10665690492421d926b1cd9a7a36bffd691 < ddf13f91ca82c94ef7ad9c41a434a03313f8eb1b, >= bc69d10665690492421d926b1cd9a7a36bffd691 < c5ebb06c7e24d531b68707168e04698859d642bc, >= bc69d10665690492421d926b1cd9a7a36bffd691 < 104d100212396801f1d9d388282f746e23e2bfd6, >= bc69d10665690492421d926b1cd9a7a36bffd691 < ff268cd9ccbce6472a0658791b417bf11c31ee39, >= bc69d10665690492421d926b1cd9a7a36bffd691 < 1ff3f528e67d20e2b1483dcaba899dc7832b2e6b, >= 5.18, >= 5.18 < 6.1.178, >= 6.2 < 6.6.144, >= 6.7 < 6.12.95, >= 6.13 < 6.18.38, >= 6.19 < 7.1.3
Fixed versions
6.1.178, 6.6.144, 6.12.95, 6.18.38, 7.1.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2026-63797 — Linux Linux, linux kernel | SECUFOCUS NOW