CVE-2026-63797
Linux kernel rpmsg use-after-free allowing kernel crash or local privilege escalation
Is CVE-2026-63797 being exploited?
Not confirmed. CVE-2026-63797 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-63797?
CVE-2026-63797 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-63797?
Yes. A fix has been recorded for CVE-2026-63797. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63797 affect?
CVE-2026-63797 affects Linux kernel (rpmsg char driver), Embedded/SoC devices using remoteproc/rpmsg, Linux distributions with rpmsg-enabled kernels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63797?
Install kernel updates with rpmsg probe-path fix or apply vendor backport and reboot devices.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malformed rpmsg messages can trigger a kernel use-after-free in the rpmsg char driver, causing crash (DoS) or possible local privilege escalation.
Patch when possible
- affected>= bc69d10665690492421d926b1cd9a7a36bffd691 and < 1306fc4f76f765727a6d5aefbf08ef0c8f32996f
- affected>= bc69d10665690492421d926b1cd9a7a36bffd691 and < ddf13f91ca82c94ef7ad9c41a434a03313f8eb1b
- affected>= bc69d10665690492421d926b1cd9a7a36bffd691 and < c5ebb06c7e24d531b68707168e04698859d642bc
- affected>= bc69d10665690492421d926b1cd9a7a36bffd691 and < 104d100212396801f1d9d388282f746e23e2bfd6
- affected>= bc69d10665690492421d926b1cd9a7a36bffd691 and < ff268cd9ccbce6472a0658791b417bf11c31ee39
- affected>= bc69d10665690492421d926b1cd9a7a36bffd691 and < 1ff3f528e67d20e2b1483dcaba899dc7832b2e6b
- affected5.18
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.