{"id":"CVE-2026-99150","aliases":[],"title":"drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr","titleSource":"Linux","descriptionSource":"Linux","products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"9eee152aab56d374edb9ad21b3db05f5cdda2fe6","status":"affected","lessThan":"652b1f26125fe48aed5f4944698a85b457eef491","versionType":"git"},{"version":"9eee152aab56d374edb9ad21b3db05f5cdda2fe6","status":"affected","lessThan":"253555a9baccefffe1f6e5f2fe54363c7c01ebb9","versionType":"git"},{"version":"9eee152aab56d374edb9ad21b3db05f5cdda2fe6","status":"affected","lessThan":"de9f6bcdb44f0e410031002e2f103826ea6b6259","versionType":"git"},{"version":"865e2dbadf6856c9219626fbd6154cac44e5fbca","status":"affected","versionType":"git"},{"version":"5.8.2","status":"affected","lessThan":"5.9","versionType":"semver"}],"defaultStatus":"unaffected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99150"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99150"}],"remediation":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr\n\namdgpu_debugfs_gpr_read() drops its runtime PM reference right after\nreading the wave registers. When copying them to userspace fails, it\njumps to the err label, which drops the reference a second time. A read\ninto a bad buffer on Navi31 either steals a reference somebody else\nholds (power/runtime_usage goes from 1 to 0) or underflows the count:\n\n  amdgpu 0000:03:00.0: Runtime PM usage count underflow!\n\nThe registers are already in the kernel buffer at that point, so finish\nthe hardware access first and copy the buffer with a single\ncopy_to_user() instead of the put_user() loop with its own error path.\n\n(cherry picked from commit 31035bbd74f7c3e10c163db875b8e67f8b50ee6a)","severity":"unknown","score":null,"published":"2026-10-28T10:35:05.753Z","modified":"2026-10-28T10:35:05.753Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://git.kernel.org/stable/c/652b1f26125fe48aed5f4944698a85b457eef491","https://git.kernel.org/stable/c/253555a9baccefffe1f6e5f2fe54363c7c01ebb9","https://git.kernel.org/stable/c/de9f6bcdb44f0e410031002e2f103826ea6b6259"],"sources":[{"name":"CVE","id":"CVE-2026-99150","modified":"2026-10-28T10:35:05.753Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99150"}],"assessments":[],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T19:50:56.313Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}