CVE-2023-52486 (GCVE-0-2023-52486)

Vulnerability from cvelistv5 – Published: 2024-02-29 15:52 – Updated: 2026-01-05 10:16
VLAI?
Title
drm: Don't unref the same fb many times by mistake due to deadlock handling
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < 376e21a9e4c2c63ee5d8d3aa74be5082c3882229 (git)
Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < 9dd334a8245011ace45e53298175c7b659edb3e7 (git)
Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < f55261469be87c55df13db76dc945f6bcd825105 (git)
Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < b4af63da9d94986c529d74499fdfe44289acd551 (git)
Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < 62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0 (git)
Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < d7afdf360f4ac142832b098b4de974e867cc063c (git)
Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < bfd0feb1b109cb63b87fdcd00122603787c75a1a (git)
Affected: 29dc0d1de18239cf3ef8bab578b8321ed340d81c , < cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c (git)
Create a notification for this product.
    Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.19.307 , ≤ 4.19.* (semver)
Unaffected: 5.4.269 , ≤ 5.4.* (semver)
Unaffected: 5.10.210 , ≤ 5.10.* (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.76 , ≤ 6.1.* (semver)
Unaffected: 6.6.15 , ≤ 6.6.* (semver)
Unaffected: 6.7.3 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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Don\u0027t unref the same fb many times by mistake due to deadlock handling\\n\\nIf we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl()\\nwe proceed to unref the fb and then retry the whole thing from the top.\\nBut we forget to reset the fb pointer back to NULL, and so if we then\\nget another error during the retry, before the fb lookup, we proceed\\nthe unref the same fb again without having gotten another reference.\\nThe end result is that the fb will (eventually) end up being freed\\nwhile it\u0027s still in use.\\n\\nReset fb to NULL once we\u0027ve unreffed it to avoid doing it again\\nuntil we\u0027ve done another fb lookup.\\n\\nThis turned out to be pretty easy to hit on a DG2 when doing async\\nflips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I\\nsaw that drm_closefb() simply got stuck in a busy loop while walking\\nthe framebuffer list. Fortunately I was able to convince it to oops\\ninstead, and from there it was easier to track down the culprit.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.307\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.269\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.210\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.149\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.76\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.15\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.3\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"4.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:16:15.128Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52486\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:16:15.128Z\", \"dateReserved\": \"2024-02-20T12:30:33.301Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T15:52:06.888Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.