{
"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-2026-45934",
"sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-45934",
"idYear": 2026,
"status": "PUBLISHED",
"publishedAt": "2026-05-27T12:17:51.905Z",
"updatedAt": "2026-10-21T12:41:00.871Z",
"importedAt": "2026-10-24T01:58:14.884Z",
"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 EEXIST abort due to non-consecutive gaps in chunk allocation",
"summary": "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": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"versions": [
{
"version": "1b9845081633072c18f30d8cfd09c267adf0b109",
"status": "affected",
"versionType": "git",
"lessThan": "12addb8ab5eec94098d4c7c6614830ccbe7ad130"
},
{
"version": "1b9845081633072c18f30d8cfd09c267adf0b109",
"status": "affected",
"versionType": "git",
"lessThan": "09207c3975e1f8f76a52472004dfcab997b4cbd6"
},
{
"version": "1b9845081633072c18f30d8cfd09c267adf0b109",
"status": "affected",
"versionType": "git",
"lessThan": "7d4eadee7042d27fcea659fcdd738f463a7d2e70"
},
{
"version": "1b9845081633072c18f30d8cfd09c267adf0b109",
"status": "affected",
"versionType": "git",
"lessThan": "156cac365e27a82b64ae510c5f463fd81f0265b1"
},
{
"version": "1b9845081633072c18f30d8cfd09c267adf0b109",
"status": "affected",
"versionType": "git",
"lessThan": "b14c5e04bd0f722ed631845599d52d03fcae1bc1"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"versions": [
{
"version": "4.1",
"status": "affected"
},
{
"version": "0",
"status": "unaffected",
"versionType": "semver",
"lessThan": "4.1"
},
{
"version": "6.6.160",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"version": "6.12.114",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"version": "6.18.14",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"version": "6.19.4",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"version": "7.0",
"status": "unaffected",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
]
}
]
}
}
}