Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV L L L N U N N H 5.5 .0023 13.8 —
AFFECTED Product Versions Fixed Linux 29dc0d1de18239cf3ef8bab578b8321ed340d81c – — Linux 4.12 – 4.19.307
TIMELINE Feb 20 Reserved by Linux Feb 29 Published (CNA: Linux) Aug 4 RESCORED — CVE-2023-52486 (Linux). CVSS 7.8 → 5.5 (NVD).
In the Linux kernel, the following vulnerability has been resolved: drm: Don't unref the same fb many times by mistake due to deadlock handling If we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl() we proceed to unref the fb and then retry the whole thing from the top. But we forget to reset the fb pointer back to NULL, and so if we then get another error during the retry, before the fb lookup, we proceed the unref the same fb again without having gotten another reference. The end result is that the fb will (eventually) end up being freed while it's still in use. Reset fb to NULL once we've unreffed it to avoid doing it again until we've done another fb lookup. This turned out to be pretty easy to hit on a DG2 when doing async flips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I saw that drm_closefb() simply got stuck in a busy loop while walking the framebuffer list. Fortunately I was able to convince it to oops instead, and from there it was easier to track down the culprit.
| Date | Event | Detail |
|---|---|---|
| February 20, 2024 | Reserved | Reserved by Linux |
| February 29, 2024 | Published | Published (CNA: Linux) |
| August 4, 2026 | RESCORED | RESCORED — CVE-2023-52486 (Linux). CVSS 7.8 → 5.5 (NVD). |
Authoritative record: CVE-2023-52486 at cve.org
Vendors: linux
Weaknesses: CWE-667
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2023-52486 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.