210 lines
14 KiB
JSON
210 lines
14 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2024-42111",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-07-29T15:50:41.176Z",
|
|
"datePublished": "2024-07-30T07:46:05.570Z",
|
|
"dateUpdated": "2026-08-05T11:35:43.268Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T11:35:43.268Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: always do the basic checks for btrfs_qgroup_inherit structure\n\n[BUG]\nSyzbot reports the following regression detected by KASAN:\n\n BUG: KASAN: slab-out-of-bounds in btrfs_qgroup_inherit+0x42e/0x2e20 fs/btrfs/qgroup.c:3277\n Read of size 8 at addr ffff88814628ca50 by task syz-executor318/5171\n\n CPU: 0 PID: 5171 Comm: syz-executor318 Not tainted 6.10.0-rc2-syzkaller-00010-g2ab795141095 #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024\n Call Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n btrfs_qgroup_inherit+0x42e/0x2e20 fs/btrfs/qgroup.c:3277\n create_pending_snapshot+0x1359/0x29b0 fs/btrfs/transaction.c:1854\n create_pending_snapshots+0x195/0x1d0 fs/btrfs/transaction.c:1922\n btrfs_commit_transaction+0xf20/0x3740 fs/btrfs/transaction.c:2382\n create_snapshot+0x6a1/0x9e0 fs/btrfs/ioctl.c:875\n btrfs_mksubvol+0x58f/0x710 fs/btrfs/ioctl.c:1029\n btrfs_mksnapshot+0xb5/0xf0 fs/btrfs/ioctl.c:1075\n __btrfs_ioctl_snap_create+0x387/0x4b0 fs/btrfs/ioctl.c:1340\n btrfs_ioctl_snap_create_v2+0x1f2/0x3a0 fs/btrfs/ioctl.c:1422\n btrfs_ioctl+0x99e/0xc60\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n RIP: 0033:0x7fcbf1992509\n RSP: 002b:00007fcbf1928218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n RAX: ffffffffffffffda RBX: 00007fcbf1a1f618 RCX: 00007fcbf1992509\n RDX: 0000000020000280 RSI: 0000000050009417 RDI: 0000000000000003\n RBP: 00007fcbf1a1f610 R08: 00007ffea1298e97 R09: 0000000000000000\n R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcbf19eb660\n R13: 00000000200002b8 R14: 00007fcbf19e60c0 R15: 0030656c69662f2e\n </TASK>\n\nAnd it also pinned it down to commit b5357cb268c4 (\"btrfs: qgroup: do not\ncheck qgroup inherit if qgroup is disabled\").\n\n[CAUSE]\nThat offending commit skips the whole qgroup inherit check if qgroup is\nnot enabled.\n\nBut that also skips the very basic checks like\nnum_ref_copies/num_excl_copies and the structure size checks.\n\nMeaning if a qgroup enable/disable race is happening at the background,\nand we pass a btrfs_qgroup_inherit structure when the qgroup is\ndisabled, the check would be completely skipped.\n\nThen at the time of transaction commitment, qgroup is re-enabled and\nbtrfs_qgroup_inherit() is going to use the incorrect structure and\ncausing the above KASAN error.\n\n[FIX]\nMake btrfs_qgroup_check_inherit() only skip the source qgroup checks.\nSo that even if invalid btrfs_qgroup_inherit structure is passed in, we\ncan still reject invalid ones no matter if qgroup is enabled or not.\n\nFurthermore we do already have an extra safety inside\nbtrfs_qgroup_inherit(), which would just ignore invalid qgroup sources,\nso even if we only skip the qgroup source check we're still safe."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 7.8,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - The vulnerability is reached through the BTRFS_IOC_SNAP_CREATE_V2/BTRFS_IOC_SUBVOL_CREATE_V2 ioctls on a mounted btrfs filesystem, requiring a local account on the system. There is no network-facing path to this code.\nAC:L - The attacker fully controls the malformed btrfs_qgroup_inherit structure and the long side of the check-to-use window, which spans an entire transaction commit and can be stretched with I/O load, and the snapshot ioctl can be replayed in a tight loop indefinitely until the window is hit. No memory layout or timing condition outside the attacker's influence is needed to trigger the out-of-bounds access itself.\nPR:L - Issuing the vulnerable ioctl requires no capability at all - subvolume creation is explicitly unrestricted and snapshot creation only requires ownership of one's own subvolume, so an ordinary unprivileged user with write access to a btrfs directory suffices. The concurrent qgroup enable is background system activity (snapper, container/LXD tooling), not a privilege the attacker must hold.\nUI:N - The attack is driven entirely by the attacker's own ioctl calls against an already-mounted btrfs filesystem. No victim action is required.\nS:U - The out-of-bounds access corrupts kernel slab memory within the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The loop performs an unbounded sequential out-of-bounds read of kernel slab memory past a buffer of attacker-chosen size, with the read length controlled by the unvalidated num_qgroups/num_ref_copies/num_excl_copies fields. Read values that match existing qgroup IDs escape zeroing and are propagated into qgroup relations, and the corrupted adjacent objects provide a route to broader kernel memory disclosure.\nI:H - The same loop performs an out-of-bounds write (*i_qgroups = 0ULL) into memory following the slab object, with both the target slab size class (via vol_args->size) and the corruption length attacker-controlled. Zeroing pointers, refcounts, and length fields in groomed neighbouring objects is a well-established path to use-after-free and privilege escalation.\nA:H - Syzbot reproduced this as a KASAN slab-out-of-bounds, and a large attacker-supplied count walks the loop into unmapped memory or destroys adjacent kernel structures, producing an oops or panic. The corruption also occurs during transaction commit, where failures escalate to a filesystem abort."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/btrfs/qgroup.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "b5357cb268c41b4e2b7383d2759fc562f5b58c33",
|
|
"lessThan": "ebe5ea02577b2c527958af1b76ac472c7ab53a56",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b5357cb268c41b4e2b7383d2759fc562f5b58c33",
|
|
"lessThan": "724d8042cef84496ddb4492dc120291f997ae26b",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "c839f73a70f312f477225b64020364e108f08231",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "6.8.10",
|
|
"lessThan": "6.9",
|
|
"status": "affected",
|
|
"versionType": "semver"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/btrfs/qgroup.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.9",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.9",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.9.9",
|
|
"lessThanOrEqual": "6.9.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.10",
|
|
"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": "6.9",
|
|
"versionEndExcluding": "6.9.9"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.9",
|
|
"versionEndExcluding": "6.10"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.8.10"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/ebe5ea02577b2c527958af1b76ac472c7ab53a56"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/724d8042cef84496ddb4492dc120291f997ae26b"
|
|
}
|
|
],
|
|
"title": "btrfs: always do the basic checks for btrfs_qgroup_inherit structure",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2024-08-02T04:54:32.553Z"
|
|
},
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/ebe5ea02577b2c527958af1b76ac472c7ab53a56",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/724d8042cef84496ddb4492dc120291f997ae26b",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2024-42111",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2024-09-10T16:17:29.663997Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2024-09-11T17:33:06.663Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |