CVE-2025-22115

Publication date 17 April 2025

Last updated 18 April 2025


Ubuntu priority

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix block group refcount race in btrfs_create_pending_block_groups() Block group creation is done in two phases, which results in a slightly unintuitive property: a block group can be allocated/deallocated from after btrfs_make_block_group() adds it to the space_info with btrfs_add_bg_to_space_info(), but before creation is completely completed in btrfs_create_pending_block_groups(). As a result, it is possible for a block group to go unused and have 'btrfs_mark_bg_unused' called on it concurrently with 'btrfs_create_pending_block_groups'. This causes a number of issues, which were fixed with the block group flag 'BLOCK_GROUP_FLAG_NEW'. However, this fix is not quite complete. Since it does not use the unused_bg_lock, it is possible for the following race to occur: btrfs_create_pending_block_groups btrfs_mark_bg_unused if list_empty // false list_del_init clear_bit else if (test_bit) // true list_move_tail And we get into the exact same broken ref count and invalid new_bgs state for transaction cleanup that BLOCK_GROUP_FLAG_NEW was designed to prevent. The broken refcount aspect will result in a warning like: [1272.943527] refcount_t: underflow; use-after-free. [1272.943967] WARNING: CPU: 1 PID: 61 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x110 [1272.944731] Modules linked in: btrfs virtio_net xor zstd_compress raid6_pq null_blk [last unloaded: btrfs] [1272.945550] CPU: 1 UID: 0 PID: 61 Comm: kworker/u32:1 Kdump: loaded Tainted: G W 6.14.0-rc5+ #108 [1272.946368] Tainted: [W]=WARN [1272.946585] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014 [1272.947273] Workqueue: btrfs_discard btrfs_discard_workfn [btrfs] [1272.947788] RIP: 0010:refcount_warn_saturate+0xba/0x110 [1272.949532] RSP: 0018:ffffbf1200247df0 EFLAGS: 00010282 [1272.949901] RAX: 0000000000000000 RBX: ffffa14b00e3f800 RCX: 0000000000000000 [1272.950437] RDX: 0000000000000000 RSI: ffffbf1200247c78 RDI: 00000000ffffdfff [1272.950986] RBP: ffffa14b00dc2860 R08: 00000000ffffdfff R09: ffffffff90526268 [1272.951512] R10: ffffffff904762c0 R11: 0000000063666572 R12: ffffa14b00dc28c0 [1272.952024] R13: 0000000000000000 R14: ffffa14b00dc2868 R15: 000001285dcd12c0 [1272.952850] FS: 0000000000000000(0000) GS:ffffa14d33c40000(0000) knlGS:0000000000000000 [1272.953458] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1272.953931] CR2: 00007f838cbda000 CR3: 000000010104e000 CR4: 00000000000006f0 [1272.954474] Call Trace: [1272.954655] <TASK> [1272.954812] ? refcount_warn_saturate+0xba/0x110 [1272.955173] ? __warn.cold+0x93/0xd7 [1272.955487] ? refcount_warn_saturate+0xba/0x110 [1272.955816] ? report_bug+0xe7/0x120 [1272.956103] ? handle_bug+0x53/0x90 [1272.956424] ? exc_invalid_op+0x13/0x60 [1272.956700] ? asm_exc_invalid_op+0x16/0x20 [1272.957011] ? refcount_warn_saturate+0xba/0x110 [1272.957399] btrfs_discard_cancel_work.cold+0x26/0x2b [btrfs] [1272.957853] btrfs_put_block_group.cold+0x5d/0x8e [btrfs] [1272.958289] btrfs_discard_workfn+0x194/0x380 [btrfs] [1272.958729] process_one_work+0x130/0x290 [1272.959026] worker_thread+0x2ea/0x420 [1272.959335] ? __pfx_worker_thread+0x10/0x10 [1272.959644] kthread+0xd7/0x1c0 [1272.959872] ? __pfx_kthread+0x10/0x10 [1272.960172] ret_from_fork+0x30/0x50 [1272.960474] ? __pfx_kthread+0x10/0x10 [1272.960745] ret_from_fork_asm+0x1a/0x30 [1272.961035] </TASK> [1272.961238] ---[ end trace 0000000000000000 ]--- Though we have seen them in the async discard workfn as well. It is most likely to happen after a relocation finishes which cancels discard, tears down the block group, etc. Fix this fully by taking the lock arou ---truncated---

Status

Package Ubuntu Release Status
linux 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation
linux-allwinner-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-aws 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation
linux-aws-5.0 24.10 oracular Not in release
24.04 LTS noble Not in release
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18.04 LTS bionic Ignored superseded by linux-aws-5.3
linux-aws-5.11 24.10 oracular Not in release
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linux-aws-5.13 24.10 oracular Not in release
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linux-aws-5.15 24.10 oracular Not in release
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Needs evaluation
linux-aws-5.19 24.10 oracular Not in release
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linux-aws-5.3 24.10 oracular Not in release
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linux-aws-5.4 24.10 oracular Not in release
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18.04 LTS bionic
Needs evaluation
linux-aws-5.8 24.10 oracular Not in release
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linux-aws-6.2 24.10 oracular Not in release
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linux-aws-6.5 24.10 oracular Not in release
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linux-aws-6.8 24.10 oracular Not in release
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Needs evaluation
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linux-aws-fips 24.10 oracular Not in release
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22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-aws-hwe 24.10 oracular Not in release
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linux-azure 24.10 oracular
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18.04 LTS bionic Ignored superseded by linux-azure-5.3
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linux-azure-4.15 24.10 oracular Not in release
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linux-azure-5.11 24.10 oracular Not in release
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linux-azure-5.13 24.10 oracular Not in release
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linux-azure-5.19 24.10 oracular Not in release
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linux-azure-5.8 24.10 oracular Not in release
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linux-azure-6.11 24.10 oracular Not in release
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linux-azure-6.2 24.10 oracular Not in release
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linux-azure-6.5 24.10 oracular Not in release
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linux-azure-edge 24.10 oracular Not in release
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linux-azure-fde 24.10 oracular Not in release
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linux-azure-fde-5.15 24.10 oracular Not in release
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linux-azure-fde-5.19 24.10 oracular Not in release
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22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-azure-nvidia 24.10 oracular Not in release
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linux-bluefield 24.10 oracular Not in release
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Needs evaluation
linux-fips 24.10 oracular Not in release
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22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
16.04 LTS xenial FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-gcp 24.10 oracular
Needs evaluation
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Needs evaluation
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Needs evaluation
18.04 LTS bionic Ignored superseded by linux-gcp-5.3
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Needs evaluation
linux-gcp-4.15 24.10 oracular Not in release
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18.04 LTS bionic
Needs evaluation
linux-gcp-5.11 24.10 oracular Not in release
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20.04 LTS focal Ignored superseded by linux-gcp-5.13
linux-gcp-5.13 24.10 oracular Not in release
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linux-gcp-5.15 24.10 oracular Not in release
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Needs evaluation
linux-gcp-5.19 24.10 oracular Not in release
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linux-gcp-5.3 24.10 oracular Not in release
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linux-gcp-5.4 24.10 oracular Not in release
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Needs evaluation
linux-gcp-5.8 24.10 oracular Not in release
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linux-gcp-6.2 24.10 oracular Not in release
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linux-gcp-6.5 24.10 oracular Not in release
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linux-gcp-6.8 24.10 oracular Not in release
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linux-gcp-fips 24.10 oracular Not in release
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22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-gke 24.10 oracular Not in release
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20.04 LTS focal Ignored end of kernel support
linux-gke-4.15 24.10 oracular Not in release
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18.04 LTS bionic Ignored superseded by linux-gke-5.0
linux-gke-5.15 24.10 oracular Not in release
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linux-gke-5.4 24.10 oracular Not in release
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18.04 LTS bionic Ignored end of kernel support
linux-gkeop 24.10 oracular Not in release
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Needs evaluation
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20.04 LTS focal Ignored end of kernel support
linux-gkeop-5.15 24.10 oracular Not in release
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linux-gkeop-5.4 24.10 oracular Not in release
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linux-hwe 24.10 oracular Not in release
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linux-hwe-5.11 24.10 oracular Not in release
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linux-hwe-5.13 24.10 oracular Not in release
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linux-hwe-5.19 24.10 oracular Not in release
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linux-hwe-5.8 24.10 oracular Not in release
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linux-hwe-6.11 24.10 oracular Not in release
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linux-ibm 24.10 oracular Not in release
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linux-intel-5.13 24.10 oracular Not in release
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linux-iot 24.10 oracular Not in release
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linux-kvm 24.10 oracular Not in release
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linux-lowlatency 24.10 oracular
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linux-lowlatency-hwe-5.15 24.10 oracular Not in release
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linux-lowlatency-hwe-5.19 24.10 oracular Not in release
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linux-nvidia 24.10 oracular Not in release
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linux-nvidia-tegra 24.10 oracular Not in release
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linux-nvidia-tegra-igx 24.10 oracular Not in release
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linux-oem 24.10 oracular Not in release
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linux-oem-5.10 24.10 oracular Not in release
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linux-oem-5.13 24.10 oracular Not in release
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linux-oem-5.14 24.10 oracular Not in release
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linux-oem-5.17 24.10 oracular Not in release
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20.04 LTS focal Not in release
linux-oem-6.5 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-oem-6.8
20.04 LTS focal Not in release
linux-oem-6.8 24.10 oracular Not in release
24.04 LTS noble
Needs evaluation
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
linux-oracle 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
linux-oracle-5.0 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored superseded by linux-oracle-5.3
linux-oracle-5.11 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-oracle-5.13
linux-oracle-5.13 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-oracle-5.15
linux-oracle-5.15 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal
Needs evaluation
linux-oracle-5.3 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored superseded by linux-oracle-5.4
linux-oracle-5.4 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Needs evaluation
linux-oracle-5.8 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-oracle-5.11
linux-oracle-6.5 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-oracle-6.8
20.04 LTS focal Not in release
linux-oracle-6.8 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Needs evaluation
20.04 LTS focal Not in release
linux-raspi 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
linux-raspi-5.4 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Needs evaluation
linux-raspi-realtime 24.10 oracular Not in release
24.04 LTS noble
Needs evaluation
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
linux-raspi2 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored replaced by linux-raspi
linux-realtime 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal Not in release
linux-riscv 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Ignored superseded by linux-riscv-5.8
linux-riscv-5.11 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-riscv-5.13
linux-riscv-5.15 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal
Needs evaluation
linux-riscv-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-riscv-5.8 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-riscv-5.11
linux-riscv-6.5 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-riscv-6.8
20.04 LTS focal Not in release
linux-riscv-6.8 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Needs evaluation
20.04 LTS focal Not in release
linux-starfive-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-starfive-6.2 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-starfive-6.5
20.04 LTS focal Not in release
linux-starfive-6.5 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-xilinx-zynqmp 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation