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.
Metrics
Affected Vendors & Products
References
History
Fri, 22 Nov 2024 12:00:00 +0000
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References |
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Mon, 04 Nov 2024 13:45:00 +0000
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Fri, 06 Sep 2024 14:00:00 +0000
Type | Values Removed | Values Added |
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First Time appeared |
Redhat rhel Eus
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CPEs | cpe:/o:redhat:rhel_eus:8.8 | |
Vendors & Products |
Redhat rhel Eus
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Thu, 08 Aug 2024 19:15:00 +0000
Type | Values Removed | Values Added |
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First Time appeared |
Redhat enterprise Linux
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CPEs | cpe:/a:redhat:enterprise_linux:8::nfv cpe:/o:redhat:enterprise_linux:8 |
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Vendors & Products |
Redhat enterprise Linux
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Wed, 07 Aug 2024 10:45:00 +0000
Type | Values Removed | Values Added |
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First Time appeared |
Redhat
Redhat rhel Aus Redhat rhel E4s Redhat rhel Tus |
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CPEs | cpe:/o:redhat:rhel_aus:8.6 cpe:/o:redhat:rhel_e4s:8.6 cpe:/o:redhat:rhel_tus:8.6 |
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Vendors & Products |
Redhat
Redhat rhel Aus Redhat rhel E4s Redhat rhel Tus |
MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-02-29T15:52:06.888Z
Updated: 2024-12-19T08:20:44.103Z
Reserved: 2024-02-20T12:30:33.301Z
Link: CVE-2023-52486
Vulnrichment
Updated: 2024-08-02T23:03:20.411Z
NVD
Status : Awaiting Analysis
Published: 2024-03-11T18:15:16.427
Modified: 2024-11-21T08:39:52.863
Link: CVE-2023-52486
Redhat