{ "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-2022-50488", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50488", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-10-04T15:43:42.352Z", "updatedAt": "2026-10-15T21:41:21.456Z", "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": "block, bfq: fix possible uaf for 'bfqq->bic'", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock, bfq: fix possible uaf for 'bfqq->bic'\n\nOur test report a uaf for 'bfqq->bic' in 5.10:\n\n==================================================================\nBUG: KASAN: use-after-free in bfq_select_queue+0x378/0xa30\n\nCPU: 6 PID: 2318352 Comm: fsstress Kdump: loaded Not tainted 5.10.0-60.18.0.50.h602.kasan.eulerosv2r11.x86_64 #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58-20220320_160524-szxrtosci10000 04/01/2014\nCall Trace:\n bfq_select_queue+0x378/0xa30\n bfq_dispatch_request+0xe8/0x130\n blk_mq_do_dispatch_sched+0x62/0xb0\n __blk_mq_sched_dispatch_requests+0x215/0x2a0\n blk_mq_sched_dispatch_requests+0x8f/0xd0\n __blk_mq_run_hw_queue+0x98/0x180\n __blk_mq_delay_run_hw_queue+0x22b/0x240\n blk_mq_run_hw_queue+0xe3/0x190\n blk_mq_sched_insert_requests+0x107/0x200\n blk_mq_flush_plug_list+0x26e/0x3c0\n blk_finish_plug+0x63/0x90\n __iomap_dio_rw+0x7b5/0x910\n iomap_dio_rw+0x36/0x80\n ext4_dio_read_iter+0x146/0x190 [ext4]\n ext4_file_read_iter+0x1e2/0x230 [ext4]\n new_sync_read+0x29f/0x400\n vfs_read+0x24e/0x2d0\n ksys_read+0xd5/0x1b0\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nCommit 3bc5e683c67d (\"bfq: Split shared queues on move between cgroups\")\nchanges that move process to a new cgroup will allocate a new bfqq to\nuse, however, the old bfqq and new bfqq can point to the same bic:\n\n1) Initial state, two process with io in the same cgroup.\n\nProcess 1 Process 2\n (BIC1) (BIC2)\n | Λ | Λ\n | | | |\n V | V |\n bfqq1 bfqq2\n\n2) bfqq1 is merged to bfqq2.\n\nProcess 1 Process 2\n (BIC1) (BIC2)\n | |\n \\-------------\\|\n V\n bfqq1 bfqq2(coop)\n\n3) Process 1 exit, then issue new io(denoce IOA) from Process 2.\n\n (BIC2)\n | Λ\n | |\n V |\n bfqq2(coop)\n\n4) Before IOA is completed, move Process 2 to another cgroup and issue io.\n\nProcess 2\n (BIC2)\n Λ\n |\\--------------\\\n | V\n bfqq2 bfqq3\n\nNow that BIC2 points to bfqq3, while bfqq2 and bfqq3 both point to BIC2.\nIf all the requests are completed, and Process 2 exit, BIC2 will be\nfreed while there is no guarantee that bfqq2 will be freed before BIC2.\n\nFix the problem by clearing bfqq->bic while bfqq is detached from bic.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "4dfc12f8c94c8052e975060f595938f75e8b7165", "status": "affected", "versionType": "git", "lessThan": "5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a" }, { "version": "81b7d0c717a487ec50e2924a773ff501ee40f0d5", "status": "affected", "versionType": "git", "lessThan": "094f3d9314d67691cb21ba091c1b528f6e3c4893" }, { "version": "3bc5e683c67d94bd839a1da2e796c15847b51b69", "status": "affected", "versionType": "git", "lessThan": "b22fd72bfebda3956efc4431b60ddfc0a51e03e0" }, { "version": "3bc5e683c67d94bd839a1da2e796c15847b51b69", "status": "affected", "versionType": "git", "lessThan": "761564d93c8265f65543acf0a576b32d66bfa26a" }, { "version": "3bc5e683c67d94bd839a1da2e796c15847b51b69", "status": "affected", "versionType": "git", "lessThan": "64dc8c732f5c2b406cc752e6aaa1bd5471159cab" }, { "version": "31326bf551269fb9bafa84ca99172b8340e5d8f8", "status": "affected", "versionType": "git" }, { "version": "43c51b86dbe551cff5d39b88aa2f41d29479f9c4", "status": "affected", "versionType": "git" }, { "version": "8615f6c0c9e7cf0ca90b6b5408784d797cbe5621", "status": "affected", "versionType": "git" }, { "version": "5.10.121", "status": "affected", "versionType": "semver", "lessThan": "5.10.175" }, { "version": "5.15.46", "status": "affected", "versionType": "semver", "lessThan": "5.15.86" }, { "version": "5.4.198", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.17.14", "status": "affected", "versionType": "semver", "lessThan": "5.18" }, { "version": "5.18.3", "status": "affected", "versionType": "semver", "lessThan": "5.19" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.19" }, { "version": "5.10.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.86", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.16", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }