{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-45934", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.086Z", "datePublished": "2026-05-27T12:17:51.905Z", "dateUpdated": "2026-10-21T12:41:00.871Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:41:00.871Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix EEXIST abort due to non-consecutive gaps in chunk allocation\n\nI have been observing a number of systems aborting at\ninsert_dev_extents() in btrfs_create_pending_block_groups(). The\nfollowing is a sample stack trace of such an abort coming from forced\nchunk allocation (typically behind CONFIG_BTRFS_EXPERIMENTAL) but this\ncan theoretically happen to any DUP chunk allocation.\n\n [81.801] ------------[ cut here ]------------\n [81.801] BTRFS: Transaction aborted (error -17)\n [81.801] WARNING: fs/btrfs/block-group.c:2876 at btrfs_create_pending_block_groups+0x721/0x770 [btrfs], CPU#1: bash/319\n [81.802] Modules linked in: virtio_net btrfs xor zstd_compress raid6_pq null_blk\n [81.803] CPU: 1 UID: 0 PID: 319 Comm: bash Kdump: loaded Not tainted 6.19.0-rc6+ #319 NONE\n [81.803] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.17.0-2-2 04/01/2014\n [81.804] RIP: 0010:btrfs_create_pending_block_groups+0x723/0x770 [btrfs]\n [81.806] RSP: 0018:ffffa36241a6bce8 EFLAGS: 00010282\n [81.806] RAX: 000000000000000d RBX: ffff8e699921e400 RCX: 0000000000000000\n [81.807] RDX: 0000000002040001 RSI: 00000000ffffffef RDI: ffffffffc0608bf0\n [81.807] RBP: 00000000ffffffef R08: ffff8e69830f6000 R09: 0000000000000007\n [81.808] R10: ffff8e699921e5e8 R11: 0000000000000000 R12: ffff8e6999228000\n [81.808] R13: ffff8e6984d82000 R14: ffff8e69966a69c0 R15: ffff8e69aa47b000\n [81.809] FS: 00007fec6bdd9740(0000) GS:ffff8e6b1b379000(0000) knlGS:0000000000000000\n [81.809] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n [81.810] CR2: 00005604833670f0 CR3: 0000000116679000 CR4: 00000000000006f0\n [81.810] Call Trace:\n [81.810] \n [81.810] __btrfs_end_transaction+0x3e/0x2b0 [btrfs]\n [81.811] btrfs_force_chunk_alloc_store+0xcd/0x140 [btrfs]\n [81.811] kernfs_fop_write_iter+0x15f/0x240\n [81.812] vfs_write+0x264/0x500\n [81.812] ksys_write+0x6c/0xe0\n [81.812] do_syscall_64+0x66/0x770\n [81.812] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n [81.813] RIP: 0033:0x7fec6be66197\n [81.814] RSP: 002b:00007fffb159dd30 EFLAGS: 00000202 ORIG_RAX: 0000000000000001\n [81.815] RAX: ffffffffffffffda RBX: 00007fec6bdd9740 RCX: 00007fec6be66197\n [81.815] RDX: 0000000000000002 RSI: 0000560483374f80 RDI: 0000000000000001\n [81.816] RBP: 0000560483374f80 R08: 0000000000000000 R09: 0000000000000000\n [81.816] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002\n [81.817] R13: 00007fec6bfb85c0 R14: 00007fec6bfb5ee0 R15: 00005604833729c0\n [81.817] \n [81.817] irq event stamp: 20039\n [81.818] hardirqs last enabled at (20047): [] __up_console_sem+0x52/0x60\n [81.818] hardirqs last disabled at (20056): [] __up_console_sem+0x37/0x60\n [81.819] softirqs last enabled at (19470): [] __irq_exit_rcu+0x96/0xc0\n [81.819] softirqs last disabled at (19463): [] __irq_exit_rcu+0x96/0xc0\n [81.820] ---[ end trace 0000000000000000 ]---\n [81.820] BTRFS: error (device dm-7 state A) in btrfs_create_pending_block_groups:2876: errno=-17 Object already exists\n\nInspecting these aborts with drgn, I observed a pattern of overlapping\nchunk_maps. Note how stripe 1 of the first chunk overlaps in physical\naddress with stripe 0 of the second chunk.\n\nPhysical Start Physical End Length Logical Type Stripe\n----------------------------------------------------------------------------------------------------\n0x0000000102500000 0x0000000142500000 1.0G 0x0000000641d00000 META|DUP 0/2\n0x0000000142500000 0x0000000182500000 1.0G 0x0000000641d00000 META|DUP 1/2\n0x0000000142500000 0x0000000182500000 1.0G 0x0000000601d00000 META|DUP 0/2\n0x0000000182500000 0x00000001c2500000 1.0G 0x0000000601d00000 META|DUP 1/2\n\nNow how could this possibly happen? All chunk allocation is\n---truncated---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/volumes.c" ], "versions": [ { "version": "1b9845081633072c18f30d8cfd09c267adf0b109", "lessThan": "12addb8ab5eec94098d4c7c6614830ccbe7ad130", "status": "affected", "versionType": "git" }, { "version": "1b9845081633072c18f30d8cfd09c267adf0b109", "lessThan": "09207c3975e1f8f76a52472004dfcab997b4cbd6", "status": "affected", "versionType": "git" }, { "version": "1b9845081633072c18f30d8cfd09c267adf0b109", "lessThan": "7d4eadee7042d27fcea659fcdd738f463a7d2e70", "status": "affected", "versionType": "git" }, { "version": "1b9845081633072c18f30d8cfd09c267adf0b109", "lessThan": "156cac365e27a82b64ae510c5f463fd81f0265b1", "status": "affected", "versionType": "git" }, { "version": "1b9845081633072c18f30d8cfd09c267adf0b109", "lessThan": "b14c5e04bd0f722ed631845599d52d03fcae1bc1", "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/volumes.c" ], "versions": [ { "version": "4.1", "status": "affected" }, { "version": "0", "lessThan": "4.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "4.1", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.12.114" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.18.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.19.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/12addb8ab5eec94098d4c7c6614830ccbe7ad130" }, { "url": "https://git.kernel.org/stable/c/09207c3975e1f8f76a52472004dfcab997b4cbd6" }, { "url": "https://git.kernel.org/stable/c/7d4eadee7042d27fcea659fcdd738f463a7d2e70" }, { "url": "https://git.kernel.org/stable/c/156cac365e27a82b64ae510c5f463fd81f0265b1" }, { "url": "https://git.kernel.org/stable/c/b14c5e04bd0f722ed631845599d52d03fcae1bc1" } ], "title": "btrfs: fix EEXIST abort due to non-consecutive gaps in chunk allocation", "x_generator": { "engine": "bippy-1.2.0" } } } }