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Message-ID: <2024111905-CVE-2024-53084-1021@gregkh> Date: Tue, 19 Nov 2024 18:45:04 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-53084: drm/imagination: Break an object reference loop Description =========== In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Break an object reference loop When remaining resources are being cleaned up on driver close, outstanding VM mappings may result in resources being leaked, due to an object reference loop, as shown below, with each object (or set of objects) referencing the object below it: PVR GEM Object GPU scheduler "finished" fence GPU scheduler “scheduled” fence PVR driver “done” fence PVR Context PVR VM Context PVR VM Mappings PVR GEM Object The reference that the PVR VM Context has on the VM mappings is a soft one, in the sense that the freeing of outstanding VM mappings is done as part of VM context destruction; no reference counts are involved, as is the case for all the other references in the loop. To break the reference loop during cleanup, free the outstanding VM mappings before destroying the PVR Context associated with the VM context. The Linux kernel CVE team has assigned CVE-2024-53084 to this issue. Affected and fixed versions =========================== Fixed in 6.11.8 with commit cb86db12b290 Fixed in 6.12 with commit b04ce1e718bd Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-53084 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/gpu/drm/imagination/pvr_context.c drivers/gpu/drm/imagination/pvr_context.h drivers/gpu/drm/imagination/pvr_vm.c drivers/gpu/drm/imagination/pvr_vm.h Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/cb86db12b290ed07d05df00d99fa150bb123e80e https://git.kernel.org/stable/c/b04ce1e718bd55302b52d05d6873e233cb3ec7a1
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