CVE - CVE-2024-43863

CVE-ID
CVE-2024-43863	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Fix a deadlock in dma buf fence polling Introduce a version of the fence ops that on release doesn't remove the fence from the pending list, and thus doesn't require a lock to fix poll->fence wait->fence unref deadlocks. vmwgfx overwrites the wait callback to iterate over the list of all fences and update their status, to do that it holds a lock to prevent the list modifcations from other threads. The fence destroy callback both deletes the fence and removes it from the list of pending fences, for which it holds a lock. dma buf polling cb unrefs a fence after it's been signaled: so the poll calls the wait, which signals the fences, which are being destroyed. The destruction tries to acquire the lock on the pending fences list which it can never get because it's held by the wait from which it was called. Old bug, but not a lot of userspace apps were using dma-buf polling interfaces. Fix those, in particular this fixes KDE stalls/deadlock.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/3b933b16c996af8adb6bc1b5748a63dfb41a82bc URL:https://git.kernel.org/stable/c/3b933b16c996af8adb6bc1b5748a63dfb41a82bc MISC:https://git.kernel.org/stable/c/9e20d028d8d1deb1e7fed18f22ffc01669cf3237 URL:https://git.kernel.org/stable/c/9e20d028d8d1deb1e7fed18f22ffc01669cf3237 MISC:https://git.kernel.org/stable/c/a8943969f9ead2fd3044fc826140a21622ef830e URL:https://git.kernel.org/stable/c/a8943969f9ead2fd3044fc826140a21622ef830e MISC:https://git.kernel.org/stable/c/c98ab18b9f315ff977c2c65d7c71298ef98be8e3 URL:https://git.kernel.org/stable/c/c98ab18b9f315ff977c2c65d7c71298ef98be8e3 MISC:https://git.kernel.org/stable/c/e58337100721f3cc0c7424a18730e4f39844934f URL:https://git.kernel.org/stable/c/e58337100721f3cc0c7424a18730e4f39844934f
Assigning CNA
kernel.org
Date Record Created
20240817	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240817)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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