{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50563", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-22T13:20:23.759Z", "datePublished": "2025-10-22T13:23:22.080Z", "dateUpdated": "2026-05-11T19:21:50.626Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:21:50.626Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm thin: Fix UAF in run_timer_softirq()\n\nWhen dm_resume() and dm_destroy() are concurrent, it will\nlead to UAF, as follows:\n\n BUG: KASAN: use-after-free in __run_timers+0x173/0x710\n Write of size 8 at addr ffff88816d9490f0 by task swapper/0/0\n\n Call Trace:\n \n dump_stack_lvl+0x73/0x9f\n print_report.cold+0x132/0xaa2\n _raw_spin_lock_irqsave+0xcd/0x160\n __run_timers+0x173/0x710\n kasan_report+0xad/0x110\n __run_timers+0x173/0x710\n __asan_store8+0x9c/0x140\n __run_timers+0x173/0x710\n call_timer_fn+0x310/0x310\n pvclock_clocksource_read+0xfa/0x250\n kvm_clock_read+0x2c/0x70\n kvm_clock_get_cycles+0xd/0x20\n ktime_get+0x5c/0x110\n lapic_next_event+0x38/0x50\n clockevents_program_event+0xf1/0x1e0\n run_timer_softirq+0x49/0x90\n __do_softirq+0x16e/0x62c\n __irq_exit_rcu+0x1fa/0x270\n irq_exit_rcu+0x12/0x20\n sysvec_apic_timer_interrupt+0x8e/0xc0\n\nOne of the concurrency UAF can be shown as below:\n\n use free\ndo_resume |\n __find_device_hash_cell |\n dm_get |\n atomic_inc(&md->holders) |\n | dm_destroy\n | __dm_destroy\n | if (!dm_suspended_md(md))\n | atomic_read(&md->holders)\n | msleep(1)\n dm_resume |\n __dm_resume |\n dm_table_resume_targets |\n pool_resume |\n do_waker #add delay work |\n dm_put |\n atomic_dec(&md->holders) |\n | dm_table_destroy\n | pool_dtr\n | __pool_dec\n | __pool_destroy\n | destroy_workqueue\n | kfree(pool) # free pool\n time out\n__do_softirq\n run_timer_softirq # pool has already been freed\n\nThis can be easily reproduced using:\n 1. create thin-pool\n 2. dmsetup suspend pool\n 3. dmsetup resume pool\n 4. dmsetup remove_all # Concurrent with 3\n\nThe root cause of this UAF bug is that dm_resume() adds timer after\ndm_destroy() skips cancelling the timer because of suspend status.\nAfter timeout, it will call run_timer_softirq(), however pool has\nalready been freed. The concurrency UAF bug will happen.\n\nTherefore, cancelling timer again in __pool_destroy()." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm-thin.c" ], "versions": [ { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "7ee059d06a5d3c15465959e0472993e80fbe4e81", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "550a4fac7ecfee5bac6a0dd772456ca62fb72f46", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "e8b8e0d2bbf7d1172c4f435621418e29ee408d46", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "7ae6aa649394e1e7f6dafb55ce0d578c0572a280", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "34fe9c2251f19786a6689149a6212c6c0de1d63b", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "34cd15d83b7206188d440b29b68084fcafde9395", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "94e231c9d6f2648d2f1f68e7f476e050ee0a6159", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd", "status": "affected", "versionType": "git" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "lessThan": "88430ebcbc0ec637b710b947738839848c20feff", "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/md/dm-thin.c" ], "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.337", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.303", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.87", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.18", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.4", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "3.2", "versionEndExcluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.0.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7ee059d06a5d3c15465959e0472993e80fbe4e81" }, { "url": "https://git.kernel.org/stable/c/550a4fac7ecfee5bac6a0dd772456ca62fb72f46" }, { "url": "https://git.kernel.org/stable/c/e8b8e0d2bbf7d1172c4f435621418e29ee408d46" }, { "url": "https://git.kernel.org/stable/c/7ae6aa649394e1e7f6dafb55ce0d578c0572a280" }, { "url": "https://git.kernel.org/stable/c/34fe9c2251f19786a6689149a6212c6c0de1d63b" }, { "url": "https://git.kernel.org/stable/c/34cd15d83b7206188d440b29b68084fcafde9395" }, { "url": "https://git.kernel.org/stable/c/94e231c9d6f2648d2f1f68e7f476e050ee0a6159" }, { "url": "https://git.kernel.org/stable/c/d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd" }, { "url": "https://git.kernel.org/stable/c/88430ebcbc0ec637b710b947738839848c20feff" } ], "title": "dm thin: Fix UAF in run_timer_softirq()", "x_generator": { "engine": "bippy-1.2.0" } } } }