In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix race when deleting quota root from the dirty cow roots list
When disabling quotas we are deleting the quota root from the list fs_info->dirty_cowonly_roots without taking the lock that protects it, which is struct btrfs_fs_info::trans_lock. This unsynchronized list manipulation may cause chaos if there's another concurrent manipulation of this list, such as when adding a root to it with ctree.c:add_root_to_dirty_list().
This can result in all sorts of weird failures caused by a race, such as the following crash:
[337571.278245] general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1] PREEMPT SMP PTI [337571.278933] CPU: 1 PID: 115447 Comm: btrfs Tainted: G W 6.4.0-rc6-btrfs-next-134+ #1 [337571.279153] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [337571.279572] RIP: 0010:commit_cowonly_roots+0x11f/0x250 [btrfs] [337571.279928] Code: 85 38 06 00 (...) [337571.280363] RSP: 0018:ffff9f63446efba0 EFLAGS: 00010206 [337571.280582] RAX: ffff942d98ec2638 RBX: ffff9430b82b4c30 RCX: 0000000449e1c000 [337571.280798] RDX: dead000000000100 RSI: ffff9430021e4900 RDI: 0000000000036070 [337571.281015] RBP: ffff942d98ec2000 R08: ffff942d98ec2000 R09: 000000000000015b [337571.281254] R10: 0000000000000009 R11: 0000000000000001 R12: ffff942fe8fbf600 [337571.281476] R13: ffff942dabe23040 R14: ffff942dabe20800 R15: ffff942d92cf3b48 [337571.281723] FS: 00007f478adb7340(0000) GS:ffff94349fa40000(0000) knlGS:0000000000000000 [337571.281950] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [337571.282184] CR2: 00007f478ab9a3d5 CR3: 000000001e02c001 CR4: 0000000000370ee0 [337571.282416] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [337571.282647] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [337571.282874] Call Trace: [337571.283101] <TASK> [337571.283327] ? __die_body+0x1b/0x60 [337571.283570] ? die_addr+0x39/0x60 [337571.283796] ? exc_general_protection+0x22e/0x430 [337571.284022] ? asm_exc_general_protection+0x22/0x30 [337571.284251] ? commit_cowonly_roots+0x11f/0x250 [btrfs] [337571.284531] btrfs_commit_transaction+0x42e/0xf90 [btrfs] [337571.284803] ? _raw_spin_unlock+0x15/0x30 [337571.285031] ? release_extent_buffer+0x103/0x130 [btrfs] [337571.285305] reset_balance_state+0x152/0x1b0 [btrfs] [337571.285578] btrfs_balance+0xa50/0x11e0 [btrfs] [337571.285864] ? __kmem_cache_alloc_node+0x14a/0x410 [337571.286086] btrfs_ioctl+0x249a/0x3320 [btrfs] [337571.286358] ? mod_objcg_state+0xd2/0x360 [337571.286577] ? refill_obj_stock+0xb0/0x160 [337571.286798] ? seq_release+0x25/0x30 [337571.287016] ? __rseq_handle_notify_resume+0x3ba/0x4b0 [337571.287235] ? percpu_counter_add_batch+0x2e/0xa0 [337571.287455] ? __x64_sys_ioctl+0x88/0xc0 [337571.287675] __x64_sys_ioctl+0x88/0xc0 [337571.287901] do_syscall_64+0x38/0x90 [337571.288126] entry_SYSCALL_64_after_hwframe+0x72/0xdc [337571.288352] RIP: 0033:0x7f478aaffe9b
So fix this by locking struct btrfs_fs_info::trans_lock before deleting the quota root from that list.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernelUpgrade kernel-livepatch-4.14.322-244.536Upgrade kernel-livepatch-5.15.122-77.145Upgrade python-perfUpgrade kernel-toolsUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade kernel-livepatch-5.10.192-182.736Upgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade bpftoolUpgrade perf | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-libbpfUpgrade bpftool-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-livepatch-6.1.41-63.109Upgrade kernel-tools-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-libbpf-staticUpgrade kernelUpgrade kernel-toolsUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade python3-perfUpgrade perfUpgrade perf-debuginfo | Feb 20, 2026 | Dec 24, 2025 |
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-intel-iot-realtimeUpgrade linux-riscv-5.15Upgrade linux-gcpUpgrade linux-hwe-5.4Upgrade linux-aws-fipsUpgrade linux-gkeUpgrade linux-ibm-5.15Upgrade linux-azure-5.15Upgrade linux-nvidiaUpgrade linux-intel-iotgUpgrade linux-realtimeUpgrade linux-ibmUpgrade linux-bluefieldUpgrade linux-gkeopUpgrade linux-intel-iotg-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-oracleUpgrade linux-xilinx-zynqmpUpgrade linux-oracle-5.4Upgrade linux-oracle-5.15Upgrade linux-kvmUpgrade linux-fipsUpgrade linux-aws-5.4Upgrade linux-lowlatencyUpgrade linux-gcp-5.15Upgrade linux-azure-fipsUpgrade linuxUpgrade linux-gcp-fipsUpgrade linux-ibm-5.4Upgrade linux-raspiUpgrade linux-nvidia-tegra-5.15Upgrade linux-azure-5.4Upgrade linux-gcp-5.4Upgrade linux-raspi-5.4Upgrade linux-hwe-5.15Upgrade linux-aws-5.15Upgrade linux-nvidia-tegra-igxUpgrade linux-azureUpgrade linux-iotUpgrade linux-awsUpgrade linux-nvidia-tegra | Jan 6, 2026 | Dec 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 24, 2025 |
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