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{"bugzilla": {"description": "kernel: drm/vmwgfx: Fix a deadlock in dma buf fence polling", "id": "2306355", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2306355"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/vmwgfx: Fix a deadlock in dma buf fence polling\nIntroduce a version of the fence ops that on release doesn't remove\nthe fence from the pending list, and thus doesn't require a lock to\nfix poll->fence wait->fence unref deadlocks.\nvmwgfx overwrites the wait callback to iterate over the list of all\nfences and update their status, to do that it holds a lock to prevent\nthe list modifcations from other threads. The fence destroy callback\nboth deletes the fence and removes it from the list of pending\nfences, for which it holds a lock.\ndma buf polling cb unrefs a fence after it's been signaled: so the poll\ncalls the wait, which signals the fences, which are being destroyed.\nThe destruction tries to acquire the lock on the pending fences list\nwhich it can never get because it's held by the wait from which it\nwas called.\nOld bug, but not a lot of userspace apps were using dma-buf polling\ninterfaces. Fix those, in particular this fixes KDE stalls/deadlock."], "name": "CVE-2024-43863", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-43863\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-43863\nhttps://lore.kernel.org/linux-cve-announce/2024082156-CVE-2024-43863-9124@gregkh/T"], "threat_severity": "Low"}

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