CVE-2026-98949
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Fix reference and vm_bo handling in remap() When a map overlaps part of an existing mapping, pvr_vm_gpuva_remap() splits the mapping into prev/next parts covering what the request did not take, instead of creating something new. It gets two things wrong. - A GEM reference is taken for each part but it's never needed and never dropped, so it leaks one reference per split (remap-next-in-2m in tests/imagination/pvr_vm_map.c): CRITICAL: 33558528 bytes of shmem still held after close - The parts still belong to the original object being split, but pvr_vm_gpuva_remap() links them to ctx->gpuvm_bo, the new object's vm_bo: prev_va --obj--> BO_A BO_B <--obj-- vm_bo (ctx->gpuvm_bo) \___________link___________/ (mismatch: BO_A != BO_B) drm_gpuva_link() catches the mismatch: WARNING: drivers/gpu/drm/drm_gpuvm.c:2108 at drm_gpuva_link+0x2ec/0x310 drm_WARN_ON(obj != vm_bo->obj) Call trace: drm_gpuva_link pvr_vm_gpuva_remap __drm_gpuvm_sm_map pvr_vm_map pvr_ioctl_vm_map Link them to op->remap.unmap->va->vm_bo instead. The locking of the GPUVA lists of the other objects touched by a split is not addressed here; it is handled by switching the GPUVM to immediate mode.
View original CVE JSON
{
"id": "CVE-2026-98949",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-23T13:17:16.037",
"lastModified": "2026-10-23T13:17:16.037",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: Fix reference and vm_bo handling in remap()\n\nWhen a map overlaps part of an existing mapping, pvr_vm_gpuva_remap()\nsplits the mapping into prev/next parts covering what the request did\nnot take, instead of creating something new. It gets two things wrong.\n\n- A GEM reference is taken for each part but it's never needed and never\n dropped, so it leaks one reference per split (remap-next-in-2m in\n tests/imagination/pvr_vm_map.c):\n\n CRITICAL: 33558528 bytes of shmem still held after close\n\n- The parts still belong to the original object being split, but\n pvr_vm_gpuva_remap() links them to ctx->gpuvm_bo, the new object's\n vm_bo:\n\n prev_va --obj--> BO_A BO_B <--obj-- vm_bo (ctx->gpuvm_bo)\n \\___________link___________/ (mismatch: BO_A != BO_B)\n\n drm_gpuva_link() catches the mismatch:\n\n WARNING: drivers/gpu/drm/drm_gpuvm.c:2108 at drm_gpuva_link+0x2ec/0x310\n drm_WARN_ON(obj != vm_bo->obj)\n Call trace:\n drm_gpuva_link\n pvr_vm_gpuva_remap\n __drm_gpuvm_sm_map\n pvr_vm_map\n pvr_ioctl_vm_map\n\n Link them to op->remap.unmap->va->vm_bo instead.\n\nThe locking of the GPUVA lists of the other objects touched by a split is\nnot addressed here; it is handled by switching the GPUVM to immediate\nmode."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/gpu/drm/imagination/pvr_vm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
"lessThan": "521cf8403a185a9d5790fe324bb43ba7ea85f51c",
"versionType": "git",
"status": "affected"
},
{
"version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
"lessThan": "9caa2eca5cc8372517ff36a83f321d4326abae93",
"versionType": "git",
"status": "affected"
},
{
"version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
"lessThan": "784356aa88b82035d70e9faeded49b70cddeb29e",
"versionType": "git",
"status": "affected"
},
{
"version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
"lessThan": "196d4d10c1b33ae176685ff42a9994a5952b1d0f",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/gpu/drm/imagination/pvr_vm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.8",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.113",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.57",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.11",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}