{ "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-2024-50225", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-50225", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-11-09T10:14:36.065Z", "updatedAt": "2026-08-05T11:42:37.937Z", "importedAt": "2026-10-24T01:57:20.494Z", "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": "btrfs: fix error propagation of split bios", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix error propagation of split bios\n\nThe purpose of btrfs_bbio_propagate_error() shall be propagating an error\nof split bio to its original btrfs_bio, and tell the error to the upper\nlayer. However, it's not working well on some cases.\n\n* Case 1. Immediate (or quick) end_bio with an error\n\nWhen btrfs sends btrfs_bio to mirrored devices, btrfs calls\nbtrfs_bio_end_io() when all the mirroring bios are completed. If that\nbtrfs_bio was split, it is from btrfs_clone_bioset and its end_io function\nis btrfs_orig_write_end_io. For this case, btrfs_bbio_propagate_error()\naccesses the orig_bbio's bio context to increase the error count.\n\nThat works well in most cases. However, if the end_io is called enough\nfast, orig_bbio's (remaining part after split) bio context may not be\nproperly set at that time. Since the bio context is set when the orig_bbio\n(the last btrfs_bio) is sent to devices, that might be too late for earlier\nsplit btrfs_bio's completion. That will result in NULL pointer\ndereference.\n\nThat bug is easily reproducible by running btrfs/146 on zoned devices [1]\nand it shows the following trace.\n\n[1] You need raid-stripe-tree feature as it create \"-d raid0 -m raid1\" FS.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 UID: 0 PID: 13 Comm: kworker/u32:1 Not tainted 6.11.0-rc7-BTRFS-ZNS+ #474\n Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n Workqueue: writeback wb_workfn (flush-btrfs-5)\n RIP: 0010:btrfs_bio_end_io+0xae/0xc0 [btrfs]\n BTRFS error (device dm-0): bdev /dev/mapper/error-test errs: wr 2, rd 0, flush 0, corrupt 0, gen 0\n RSP: 0018:ffffc9000006f248 EFLAGS: 00010246\n RAX: 0000000000000000 RBX: ffff888005a7f080 RCX: ffffc9000006f1dc\n RDX: 0000000000000000 RSI: 000000000000000a RDI: ffff888005a7f080\n RBP: ffff888011dfc540 R08: 0000000000000000 R09: 0000000000000001\n R10: ffffffff82e508e0 R11: 0000000000000005 R12: ffff88800ddfbe58\n R13: ffff888005a7f080 R14: ffff888005a7f158 R15: ffff888005a7f158\n FS: 0000000000000000(0000) GS:ffff88803ea80000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000020 CR3: 0000000002e22006 CR4: 0000000000370ef0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n \n ? __die_body.cold+0x19/0x26\n ? page_fault_oops+0x13e/0x2b0\n ? _printk+0x58/0x73\n ? do_user_addr_fault+0x5f/0x750\n ? exc_page_fault+0x76/0x240\n ? asm_exc_page_fault+0x22/0x30\n ? btrfs_bio_end_io+0xae/0xc0 [btrfs]\n ? btrfs_log_dev_io_error+0x7f/0x90 [btrfs]\n btrfs_orig_write_end_io+0x51/0x90 [btrfs]\n dm_submit_bio+0x5c2/0xa50 [dm_mod]\n ? find_held_lock+0x2b/0x80\n ? blk_try_enter_queue+0x90/0x1e0\n __submit_bio+0xe0/0x130\n ? ktime_get+0x10a/0x160\n ? lockdep_hardirqs_on+0x74/0x100\n submit_bio_noacct_nocheck+0x199/0x410\n btrfs_submit_bio+0x7d/0x150 [btrfs]\n btrfs_submit_chunk+0x1a1/0x6d0 [btrfs]\n ? lockdep_hardirqs_on+0x74/0x100\n ? __folio_start_writeback+0x10/0x2c0\n btrfs_submit_bbio+0x1c/0x40 [btrfs]\n submit_one_bio+0x44/0x60 [btrfs]\n submit_extent_folio+0x13f/0x330 [btrfs]\n ? btrfs_set_range_writeback+0xa3/0xd0 [btrfs]\n extent_writepage_io+0x18b/0x360 [btrfs]\n extent_write_locked_range+0x17c/0x340 [btrfs]\n ? __pfx_end_bbio_data_write+0x10/0x10 [btrfs]\n run_delalloc_cow+0x71/0xd0 [btrfs]\n btrfs_run_delalloc_range+0x176/0x500 [btrfs]\n ? find_lock_delalloc_range+0x119/0x260 [btrfs]\n writepage_delalloc+0x2ab/0x480 [btrfs]\n extent_write_cache_pages+0x236/0x7d0 [btrfs]\n btrfs_writepages+0x72/0x130 [btrfs]\n do_writepages+0xd4/0x240\n ? find_held_lock+0x2b/0x80\n ? wbc_attach_and_unlock_inode+0x12c/0x290\n ? wbc_attach_and_unlock_inode+0x12c/0x29\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "852eee62d31abd695cd43e1b875d664ed292a8ca", "status": "affected", "versionType": "git", "lessThan": "22833d89b780ba0f9f66e19c477e7decf638edce" }, { "version": "852eee62d31abd695cd43e1b875d664ed292a8ca", "status": "affected", "versionType": "git", "lessThan": "d48e1dea3931de64c26717adc2b89743c7ab6594" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.3" }, { "version": "6.11.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.11.*" }, { "version": "6.12", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }