122 lines
7.3 KiB
JSON
122 lines
7.3 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80919",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.801Z",
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"datePublished": "2026-09-09T16:13:16.415Z",
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"dateUpdated": "2026-09-09T16:13:16.415Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-09-09T16:13:16.415Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix recursive ww_mutex acquire in amdgpu_devcoredump_format\n\nWhen dumping IB contents from a hung job, amdgpu_devcoredump_format()\nacquired the VM root PD's reservation via amdgpu_vm_lock_by_pasid() and\nthen, for each IB, called amdgpu_bo_reserve() on the BO backing the IB.\nBoth reservations are reservation_ww_class_mutex objects and neither\nused a ww_acquire_ctx, which trips lockdep:\n\n WARNING: possible recursive locking detected\n --------------------------------------------\n kworker/u128:0 is trying to acquire lock:\n ffff88838b16e1f0 (reservation_ww_class_mutex){+.+.}-{4:4},\n at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu]\n\n but task is already holding lock:\n ffff8882f82681f0 (reservation_ww_class_mutex){+.+.}-{4:4},\n at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu]\n\n Possible unsafe locking scenario:\n CPU0\n ----\n lock(reservation_ww_class_mutex);\n lock(reservation_ww_class_mutex);\n\n *** DEADLOCK ***\n May be due to missing lock nesting notation\n\n Workqueue: events_unbound amdgpu_devcoredump_deferred_work [amdgpu]\n Call Trace:\n __ww_mutex_lock.constprop.0\n ww_mutex_lock\n amdgpu_bo_reserve\n amdgpu_devcoredump_format+0x1594 [amdgpu]\n amdgpu_devcoredump_deferred_work+0xea [amdgpu]\n\nThe two reservations are on different BOs in the captured trace, so the\nsplat is a lockdep-correctness warning, not an observed deadlock. It\nbecomes a real self-deadlock whenever the IB BO shares its dma_resv with\nthe root PD (the always-valid case, see amdgpu_vm_is_bo_always_valid()):\namdgpu_bo_reserve(abo) re-acquires the same ww_mutex without a ticket\nand blocks forever. With amdgpu.gpu_recovery=0 the timeout handler\nrefires every ~2 s and each invocation produces this splat, drowning the\nkernel ring buffer.\n\nNow that amdgpu_vm_lock_by_pasid() takes a drm_exec context, move the IB\ndumping into a separate helper that locks the root PD and every IB BO\ntogether in a single drm_exec ticket. DRM_EXEC_IGNORE_DUPLICATES handles\nIB BOs that share a dma_resv (e.g. always-valid BOs, or two IBs backed\nby the same BO). Every lock is now a top-level acquire under one\nww_acquire_ctx, so the recursive ww_mutex condition is gone, and the\nper-IB amdgpu_bo_reserve()/amdgpu_bo_unref() dance -- including a BO\nrefcount leak on the amdgpu_bo_reserve() failure path -- is removed.\n\n(cherry picked from commit d6bf4242731219ee08ce54c365631e395486651e)"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c"
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],
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"versions": [
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{
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"version": "7b15fc2d1f1a00fb99f0146e404ff2600999ec74",
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"lessThan": "4e9b4dee0777ec9c835a4746e2d30382dd9d1044",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7b15fc2d1f1a00fb99f0146e404ff2600999ec74",
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"lessThan": "7152b248dc3c8d5fa8629e99ed5655dd41b51562",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c"
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],
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"versions": [
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{
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"version": "7.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.11",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.1.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4e9b4dee0777ec9c835a4746e2d30382dd9d1044"
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},
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{
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"url": "https://git.kernel.org/stable/c/7152b248dc3c8d5fa8629e99ed5655dd41b51562"
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}
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],
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"title": "drm/amdgpu: fix recursive ww_mutex acquire in amdgpu_devcoredump_format",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |