| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "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 <TASK>\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": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/btrfs/scrub.c" |
| ], |
| "versions": [ |
| { |
| "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", |
| "lessThan": "642b9c520ef2f104277ad1f902f8526edbe087fb", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", |
| "lessThan": "34de0f04684ec00c093a0455648be055f0e8e24f", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5", |
| "lessThan": "f546c4282673497a06ecb6190b50ae7f6c85b02f", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/btrfs/scrub.c" |
| ], |
| "versions": [ |
| { |
| "version": "6.4", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "6.4", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.15", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.7.3", |
| "lessThanOrEqual": "6.7.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.8", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.4", |
| "versionEndExcluding": "6.6.15" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.4", |
| "versionEndExcluding": "6.7.3" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.4", |
| "versionEndExcluding": "6.8" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f" |
| } |
| ], |
| "title": "btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-26616", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
