{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64100", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.033Z", "datePublished": "2026-07-19T15:40:05.530Z", "dateUpdated": "2026-07-19T15:40:05.530Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:40:05.530Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm: Fix shrinker deadlock\n\nWith PROVE_LOCKING on an Snapdragon X1 and VM reclaim pressure, we see:\n\n ======================================================\n WARNING: possible circular locking dependency detected\n 7.0.0-debug+ #43 Tainted: G W\n ------------------------------------------------------\n kswapd0/82 is trying to acquire lock:\n ffff800080ec3870 (reservation_ww_class_acquire){+.+.}-{0:0}, at: msm_gem_shrinker_scan+0x17c/0x400 [msm]\n\n but task is already holding lock:\n ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n which lock already depends on the new lock.\n\n the existing dependency chain (in reverse order) is:\n\n -> #2 (fs_reclaim){+.+.}-{0:0}:\n __lock_acquire+0x4d0/0xad0\n lock_acquire.part.0+0xc4/0x248\n lock_acquire+0x8c/0x248\n fs_reclaim_acquire+0xd0/0xf0\n dma_resv_lockdep+0x224/0x348\n do_one_initcall+0x84/0x5d0\n do_initcalls+0x194/0x1d8\n kernel_init_freeable+0x128/0x180\n kernel_init+0x2c/0x160\n ret_from_fork+0x10/0x20\n\n -> #1 (reservation_ww_class_mutex){+.+.}-{4:4}:\n __lock_acquire+0x4d0/0xad0\n lock_acquire.part.0+0xc4/0x248\n lock_acquire+0x8c/0x248\n dma_resv_lockdep+0x1a8/0x348\n do_one_initcall+0x84/0x5d0\n do_initcalls+0x194/0x1d8\n kernel_init_freeable+0x128/0x180\n kernel_init+0x2c/0x160\n ret_from_fork+0x10/0x20\n\n -> #0 (reservation_ww_class_acquire){+.+.}-{0:0}:\n check_prev_add+0x114/0x790\n validate_chain+0x594/0x6f0\n __lock_acquire+0x4d0/0xad0\n lock_acquire.part.0+0xc4/0x248\n lock_acquire+0x8c/0x248\n drm_gem_lru_scan+0x1ac/0x440\n msm_gem_shrinker_scan+0x17c/0x400 [msm]\n do_shrink_slab+0x150/0x4a0\n shrink_slab+0x144/0x460\n shrink_one+0x9c/0x1b0\n shrink_many+0x27c/0x5c0\n shrink_node+0x344/0x550\n balance_pgdat+0x2c0/0x988\n kswapd+0x11c/0x318\n kthread+0x10c/0x128\n ret_from_fork+0x10/0x20\n\n other info that might help us debug this:\n Chain exists of:\n reservation_ww_class_acquire --> reservation_ww_class_mutex --> fs_reclaim\n Possible unsafe locking scenario:\n CPU0 CPU1\n ---- ----\n lock(fs_reclaim);\n lock(reservation_ww_class_mutex);\n lock(fs_reclaim);\n lock(reservation_ww_class_acquire);\n\n *** DEADLOCK ***\n 1 lock held by kswapd0/82:\n #0: ffffc31709b263b8 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x88/0x988\n\n stack backtrace:\n CPU: 4 UID: 0 PID: 82 Comm: kswapd0 Tainted: G W 7.0.0-debug+ #43 PREEMPT(full)\n Tainted: [W]=WARN\n Hardware name: LENOVO 21BX0016US/21BX0016US, BIOS N3HET94W (1.66 ) 09/15/2025\n Call trace:\n show_stack+0x20/0x40 (C)\n dump_stack_lvl+0x9c/0xd0\n dump_stack+0x18/0x30\n print_circular_bug+0x114/0x120\n check_noncircular+0x178/0x198\n check_prev_add+0x114/0x790\n validate_chain+0x594/0x6f0\n __lock_acquire+0x4d0/0xad0\n lock_acquire.part.0+0xc4/0x248\n lock_acquire+0x8c/0x248\n drm_gem_lru_scan+0x1ac/0x440\n msm_gem_shrinker_scan+0x17c/0x400 [msm]\n do_shrink_slab+0x150/0x4a0\n shrink_slab+0x144/0x460\n shrink_one+0x9c/0x1b0\n shrink_many+0x27c/0x5c0\n shrink_node+0x344/0x550\n balance_pgdat+0x2c0/0x988\n kswapd+0x11c/0x318\n kthread+0x10c/0x128\n ret_from_fork+0x10/0x20\n\nkswapd0 holding fs_reclaim calls the MSM shrinker, which calls\ndma_resv_lock. This in turn acquires fs_reclaim.\n\nFix this deadlock by using dma_resv_trylock() instead, dropping the\nsubsequently unused passed wait-wound lock 'ticket'.\n\nPatchwork: https://patchwork.freedesktop.org/patch/723564/\n[rob: fixup compile errors, replace lockdep splat with somethin\n---truncated---" } ], "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_shrinker.c" ], "versions": [ { "version": "fe4952b5f27cca5d143d3de249562d4cc984c1d6", "lessThan": "942968260e61d4a5d7552b20814b6277f9c553df", "status": "affected", "versionType": "git" }, { "version": "fe4952b5f27cca5d143d3de249562d4cc984c1d6", "lessThan": "928788566c79046f71a211fc32c115400be76402", "status": "affected", "versionType": "git" }, { "version": "fe4952b5f27cca5d143d3de249562d4cc984c1d6", "lessThan": "3392291fc509d8ad6e4ad90f15b0a193f721cbc9", "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_shrinker.c" ], "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.17", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/942968260e61d4a5d7552b20814b6277f9c553df" }, { "url": "https://git.kernel.org/stable/c/928788566c79046f71a211fc32c115400be76402" }, { "url": "https://git.kernel.org/stable/c/3392291fc509d8ad6e4ad90f15b0a193f721cbc9" } ], "title": "drm/msm: Fix shrinker deadlock", "x_generator": { "engine": "bippy-1.2.0" } } } }