{"id":"CVE-2026-98180","summary":"drm/msm: RCU-free the scheduler-containing ring and VM objects","details":"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-\u003esched-\u003ename, 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/","modified":"2026-10-08T02:52:52.488837571Z","published":"2026-10-06T08:44:23.327Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98180.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/01c8d1f385f788f1bbbbb7687c4386d614281218"},{"type":"WEB","url":"https://git.kernel.org/stable/c/713abac5c04ccbae67f9ac68c3921845535388e7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d81bf4581903b0cba0698cd4d1c07fc6be21754a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98180.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98180"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1d8a5ca436ee4a28eec14cb813f790f7cdeeee19"},{"fixed":"d81bf4581903b0cba0698cd4d1c07fc6be21754a"},{"fixed":"713abac5c04ccbae67f9ac68c3921845535388e7"},{"fixed":"01c8d1f385f788f1bbbbb7687c4386d614281218"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98180.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.18.54"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98180.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}