rpmsg: char: Fix use-after-free on probe error path (CVE-2026-63797) | HOL Guard CVE

High · CVSS 8.4CVE-2026-63797

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

Answer in brief

CVE-2026-63797 records a High severity (CVSS 8.4) vulnerability in rpmsg: char: Fix use-after-free on probe error path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 19, 2026Updated Aug 17, 2026Source checked Sep 20, 2026First seen by HOL Aug 5, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.4
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=bc69d10665690492421d926b1cd9a7a36bffd691 <1306fc4f76f765727a6d5aefbf08ef0c8f32996f \|\| >=bc69d10665690492421d926b1cd9a7a36bffd691 <ddf13f91ca82c94ef7ad9c41a434a03313f8eb1b \|\| >=bc69d10665690492421d926b1cd9a7a36bffd691 <c5ebb06c7e24d531b68707168e04698859d642bc \|\| >=bc69d10665690492421d926b1cd9a7a36bffd691 <104d100212396801f1d9d388282f746e23e2bfd6 \|\| >=bc69d10665690492421d926b1cd9a7a36bffd691 <ff268cd9ccbce6472a0658791b417bf11c31ee39 \|\| >=bc69d10665690492421d926b1cd9a7a36bffd691 <1ff3f528e67d20e2b1483dcaba899dc7832b2e6b	1306fc4f76f765727a6d5aefbf08ef0c8f32996f, ddf13f91ca82c94ef7ad9c41a434a03313f8eb1b, c5ebb06c7e24d531b68707168e04698859d642bc, 104d100212396801f1d9d388282f746e23e2bfd6, ff268cd9ccbce6472a0658791b417bf11c31ee39, 1ff3f528e67d20e2b1483dcaba899dc7832b2e6b
Linux/Linuxgeneric	5.18	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 1306fc4f76f765727a6d5aefbf08ef0c8f32996f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.