{ "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-2024-26616", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-26616", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-02-29T15:52:19.452Z", "updatedAt": "2026-05-11T20:00:50.930Z", "importedAt": "2026-10-24T01:57:07.518Z", "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: scrub: avoid use-after-free when chunk length is not 64K aligned", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n BTRFS info (device vdb): scrub: started on devid 1\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n ==================================================================\n BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n Call Trace:\n \n dump_stack_lvl+0x43/0x60\n print_report+0xcf/0x640\n kasan_report+0xa6/0xd0\n __blk_rq_map_sg+0x18f/0x7c0\n virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n blk_mq_flush_plug_list.part.0+0x780/0x860\n __blk_flush_plug+0x1ba/0x220\n blk_finish_plug+0x3b/0x60\n submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n __x64_sys_ioctl+0xbd/0x100\n do_syscall_64+0x5d/0xe0\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it's at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n Since we may read less than 64K at the end of the chunk, we should not\n touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n This is done by calculating the real number of sectors we need to\n read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won't need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n With above fixes, we won't update error bit for range beyond chunk,\n thus scrub_stripe_submit_repair_read() should never submit any read\n beyond the chunk.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "status": "affected", "versionType": "git", "lessThan": "642b9c520ef2f104277ad1f902f8526edbe087fb" }, { "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "status": "affected", "versionType": "git", "lessThan": "34de0f04684ec00c093a0455648be055f0e8e24f" }, { "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", "status": "affected", "versionType": "git", "lessThan": "f546c4282673497a06ecb6190b50ae7f6c85b02f" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.4" }, { "version": "6.6.15", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.7.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.7.*" }, { "version": "6.8", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }