{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98180", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.322Z", "datePublished": "2026-10-06T08:44:23.327Z", "dateUpdated": "2026-10-19T09:15:11.540Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:15:11.540Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm: RCU-free the scheduler-containing ring and VM objects\n\nBoth struct msm_ringbuffer and struct msm_gem_vm embed a struct\ndrm_gpu_scheduler. msm_ringbuffer_destroy() and the VM free callback\nmsm_gem_vm_free() call drm_sched_fini() on the embedded scheduler and then\nfree the containing object with plain kfree().\n\ndrm_sched_fence_get_timeline_name() returns fence->sched->name, and the\nscheduler fence keeps a .release callback so it is not ops-detached on\nsignalling. A finished fence exported to userspace (the submit out-fence, or\na VM_BIND fence, via sync_file / drm_syncobj) keeps pointing at the embedded\nscheduler after the ring/VM is freed, so a later get_timeline_name() --\nreachable unprivileged through SYNC_IOC_FILE_INFO -- dereferences freed slab\nmemory (KASAN slab-use-after-free read).\n\nPer the dma-fence lifetime contract the exporter must keep the data backing a\nsignalled fence alive for an RCU grace period. Free the scheduler-containing\nobjects with kfree_rcu() instead of kfree().\n\nPatchwork: https://patchwork.freedesktop.org/patch/750234/" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The freed memory is reached by a local process through render-node ioctls (MSM_SET_PARAM to enable VM_BIND, MSM_VM_BIND/MSM_GEM_SUBMIT with an out-fence) followed by SYNC_IOC_FILE_INFO on the exported sync_file. No remote data is involved.\nAC:L - The attacker runs every step: create a user-managed VM, submit a VM_BIND job with an out-fence fd, close the DRM fd so msm_gem_vm_close()/msm_gem_vm_free() kfree the VM, then query the sync_file. They choose when the free happens, so there is no race they can't control.\nPR:L - All msm ioctls used are DRM_RENDER_ALLOW and the sync_file ioctl needs only the fd. An unprivileged user with render-node access (render group, or any Android app with GPU access) can do this without capabilities.\nUI:N - No victim action is needed. The attacker creates and frees the VM and queries the fence entirely through their own file descriptors.\nS:U - This is a use-after-free in the kernel's own memory with impact inside the same kernel authority. No VM, IOMMU or sandbox boundary is crossed.\nC:H - drm_sched_fence_get_timeline_name() returns fence->sched->name from the freed msm_gem_vm. If the slab is refilled with attacker data, that name pointer is attacker-controlled, and sync_fill_fence_info() strscpy()s up to 32 bytes from that address into obj_name returned to userspace. That is a repeatable arbitrary kernel read.\nI:N - Nothing writes through the stale fence->sched: get_timeline_name only reads it and sched_entity.c only compares the pointer. The freed scheduler gives a read primitive, not a write or control-flow primitive.\nA:H - Dereferencing freed or reclaimed memory and strscpy() from a bad name pointer causes a kernel oops/panic (KASAN slab-use-after-free read), which the attacker can trigger repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/msm/msm_gem.h", "drivers/gpu/drm/msm/msm_gem_vma.c", "drivers/gpu/drm/msm/msm_ringbuffer.c", "drivers/gpu/drm/msm/msm_ringbuffer.h" ], "versions": [ { "version": "1d8a5ca436ee4a28eec14cb813f790f7cdeeee19", "lessThan": "d81bf4581903b0cba0698cd4d1c07fc6be21754a", "status": "affected", "versionType": "git" }, { "version": "1d8a5ca436ee4a28eec14cb813f790f7cdeeee19", "lessThan": "713abac5c04ccbae67f9ac68c3921845535388e7", "status": "affected", "versionType": "git" }, { "version": "1d8a5ca436ee4a28eec14cb813f790f7cdeeee19", "lessThan": "01c8d1f385f788f1bbbbb7687c4386d614281218", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/msm/msm_gem.h", "drivers/gpu/drm/msm/msm_gem_vma.c", "drivers/gpu/drm/msm/msm_ringbuffer.c", "drivers/gpu/drm/msm/msm_ringbuffer.h" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d81bf4581903b0cba0698cd4d1c07fc6be21754a" }, { "url": "https://git.kernel.org/stable/c/713abac5c04ccbae67f9ac68c3921845535388e7" }, { "url": "https://git.kernel.org/stable/c/01c8d1f385f788f1bbbbb7687c4386d614281218" } ], "title": "drm/msm: RCU-free the scheduler-containing ring and VM objects", "x_generator": { "engine": "bippy-1.2.0" } } } }