Answer in brief
CVE-2023-52486 records a High severity (CVSS 7.8) vulnerability in drm: Don't unref the same fb many times by mistake due to deadlock handling. 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.
CVSS is 7.8. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <376e21a9e4c2c63ee5d8d3aa74be5082c3882229 || >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <9dd334a8245011ace45e53298175c7b659edb3e7 || >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <f55261469be87c55df13db76dc945f6bcd825105 || >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <b4af63da9d94986c529d74499fdfe44289acd551 || >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0 || >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <d7afdf360f4ac142832b098b4de974e867cc063c || >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <bfd0feb1b109cb63b87fdcd00122603787c75a1a || >=29dc0d1de18239cf3ef8bab578b8321ed340d81c <cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c | 376e21a9e4c2c63ee5d8d3aa74be5082c3882229, 9dd334a8245011ace45e53298175c7b659edb3e7, f55261469be87c55df13db76dc945f6bcd825105, b4af63da9d94986c529d74499fdfe44289acd551, 62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0, d7afdf360f4ac142832b098b4de974e867cc063c, bfd0feb1b109cb63b87fdcd00122603787c75a1a, cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c |
| Linux/Linuxgeneric | 4.12 | Not reported |
Published upstream
Feb 29, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.