CVE-2023-52486

Advisory lineage Upstream: 0 Downstream: 32
Analyzed
Published: 29 Feb 2024, 15:52
Last modified:11 May 2026, 19:28

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
<0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

29 Feb 2024, 15:52
Published
Vulnerability first disclosed
11 May 2026, 19:28
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 0%

Techniques & Countermeasures

  • CWE-667•Improper Locking

    The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Systems

  • linux•linux

    ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < 376e21a9e4c2c63ee5d8d3aa74be5082c3882229 | ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < 9dd334a8245011ace45e53298175c7b659edb3e7 | ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < f55261469be87c55df13db76dc945f6bcd825105 | ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < b4af63da9d94986c529d74499fdfe44289acd551 | ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < 62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0 | ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < d7afdf360f4ac142832b098b4de974e867cc063c | ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < bfd0feb1b109cb63b87fdcd00122603787c75a1a | ≥ 29dc0d1de18239cf3ef8bab578b8321ed340d81c, < cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c | 4.12

  • linux•linux_kernel

    < 4.19.307 | ≥ 4.20, < 5.4.269 | ≥ 5.5, < 5.10.210 | ≥ 5.11, < 5.15.149 | ≥ 5.16, < 6.1.76 | ≥ 6.2, < 6.6.15 | ≥ 6.7, < 6.7.3

References (10)