{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-50563", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50563", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-10-22T13:23:22.080Z", "updatedAt": "2026-05-11T19:21:50.626Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "dm thin: Fix UAF in run_timer_softirq()", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "7ee059d06a5d3c15465959e0472993e80fbe4e81" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "550a4fac7ecfee5bac6a0dd772456ca62fb72f46" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "e8b8e0d2bbf7d1172c4f435621418e29ee408d46" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "7ae6aa649394e1e7f6dafb55ce0d578c0572a280" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "34fe9c2251f19786a6689149a6212c6c0de1d63b" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "34cd15d83b7206188d440b29b68084fcafde9395" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "94e231c9d6f2648d2f1f68e7f476e050ee0a6159" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd" }, { "version": "991d9fa02da0dd1f843dc011376965e0c8c6c9b5", "status": "affected", "versionType": "git", "lessThan": "88430ebcbc0ec637b710b947738839848c20feff" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.2" }, { "version": "4.9.337", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.303", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.229", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.163", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.87", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.18", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }