{ "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-2022-50752", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50752", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-12-24T13:05:46.881Z", "updatedAt": "2026-08-05T08:59:39.128Z", "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": "md/raid5: Remove unnecessary bio_put() in raid5_read_one_chunk()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: Remove unnecessary bio_put() in raid5_read_one_chunk()\n\nWhen running chunk-sized reads on disks with badblocks duplicate bio\nfree/puts are observed:\n\n =============================================================================\n BUG bio-200 (Not tainted): Object already free\n -----------------------------------------------------------------------------\n Allocated in mempool_alloc_slab+0x17/0x20 age=3 cpu=2 pid=7504\n __slab_alloc.constprop.0+0x5a/0xb0\n kmem_cache_alloc+0x31e/0x330\n mempool_alloc_slab+0x17/0x20\n mempool_alloc+0x100/0x2b0\n bio_alloc_bioset+0x181/0x460\n do_mpage_readpage+0x776/0xd00\n mpage_readahead+0x166/0x320\n blkdev_readahead+0x15/0x20\n read_pages+0x13f/0x5f0\n page_cache_ra_unbounded+0x18d/0x220\n force_page_cache_ra+0x181/0x1c0\n page_cache_sync_ra+0x65/0xb0\n filemap_get_pages+0x1df/0xaf0\n filemap_read+0x1e1/0x700\n blkdev_read_iter+0x1e5/0x330\n vfs_read+0x42a/0x570\n Freed in mempool_free_slab+0x17/0x20 age=3 cpu=2 pid=7504\n kmem_cache_free+0x46d/0x490\n mempool_free_slab+0x17/0x20\n mempool_free+0x66/0x190\n bio_free+0x78/0x90\n bio_put+0x100/0x1a0\n raid5_make_request+0x2259/0x2450\n md_handle_request+0x402/0x600\n md_submit_bio+0xd9/0x120\n __submit_bio+0x11f/0x1b0\n submit_bio_noacct_nocheck+0x204/0x480\n submit_bio_noacct+0x32e/0xc70\n submit_bio+0x98/0x1a0\n mpage_readahead+0x250/0x320\n blkdev_readahead+0x15/0x20\n read_pages+0x13f/0x5f0\n page_cache_ra_unbounded+0x18d/0x220\n Slab 0xffffea000481b600 objects=21 used=0 fp=0xffff8881206d8940 flags=0x17ffffc0010201(locked|slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n CPU: 0 PID: 34525 Comm: kworker/u24:2 Not tainted 6.0.0-rc2-localyes-265166-gf11c5343fa3f #143\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n Workqueue: raid5wq raid5_do_work\n Call Trace:\n \n dump_stack_lvl+0x5a/0x78\n dump_stack+0x10/0x16\n print_trailer+0x158/0x165\n object_err+0x35/0x50\n free_debug_processing.cold+0xb7/0xbe\n __slab_free+0x1ae/0x330\n kmem_cache_free+0x46d/0x490\n mempool_free_slab+0x17/0x20\n mempool_free+0x66/0x190\n bio_free+0x78/0x90\n bio_put+0x100/0x1a0\n mpage_end_io+0x36/0x150\n bio_endio+0x2fd/0x360\n md_end_io_acct+0x7e/0x90\n bio_endio+0x2fd/0x360\n handle_failed_stripe+0x960/0xb80\n handle_stripe+0x1348/0x3760\n handle_active_stripes.constprop.0+0x72a/0xaf0\n raid5_do_work+0x177/0x330\n process_one_work+0x616/0xb20\n worker_thread+0x2bd/0x6f0\n kthread+0x179/0x1b0\n ret_from_fork+0x22/0x30\n \n\nThe double free is caused by an unnecessary bio_put() in the\nif(is_badblock(...)) error path in raid5_read_one_chunk().\n\nThe error path was moved ahead of bio_alloc_clone() in c82aa1b76787c\n(\"md/raid5: move checking badblock before clone bio in\nraid5_read_one_chunk\"). The previous code checked and freed align_bio\nwhich required a bio_put. After the move that is no longer needed as\nraid_bio is returned to the control of the common io path which\nperforms its own endio resulting in a double free on bad device blocks.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "c82aa1b76787c34fd02374e519b6f52cdeb2f54b", "status": "affected", "versionType": "git", "lessThan": "7a37c58ee72e1fadd22c4ee990cb74c2ca2280e7" }, { "version": "c82aa1b76787c34fd02374e519b6f52cdeb2f54b", "status": "affected", "versionType": "git", "lessThan": "c0fd5d4d8fd7b1a50306d7a23c720cf808f41fdf" }, { "version": "c82aa1b76787c34fd02374e519b6f52cdeb2f54b", "status": "affected", "versionType": "git", "lessThan": "21a9c7354aa59e97e26ece5f0a609c8bfa43020d" }, { "version": "c82aa1b76787c34fd02374e519b6f52cdeb2f54b", "status": "affected", "versionType": "git", "lessThan": "c66a6f41e09ad386fd2cce22b9cded837bbbc704" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.14" }, { "version": "5.15.75", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.19.17", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.19.*" }, { "version": "6.0.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }