{"cve":"CVE-2022-50752","nvd":{"published":"2025-12-24T13:16:01.930","modified":"2026-08-04T10:18:23.233","status":"Deferred","description":"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    <TASK>\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    </TASK>\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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/21a9c7354aa59e97e26ece5f0a609c8bfa43020d","https://git.kernel.org/stable/c/7a37c58ee72e1fadd22c4ee990cb74c2ca2280e7","https://git.kernel.org/stable/c/c0fd5d4d8fd7b1a50306d7a23c720cf808f41fdf","https://git.kernel.org/stable/c/c66a6f41e09ad386fd2cce22b9cded837bbbc704"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:17:07.138532058+00:00"},"epss":{"cve":"CVE-2022-50752","score":0.00196,"percentile":0.09327,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}