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CVE-2025-40138: Linux kernel F2FS file system may crash on quota check
CVE-2025-40138 · published 11 months ago
Summary
The F2FS file system used in several Ubuntu kernel builds can hit a null‑pointer error when checking disk quotas, which can cause the system to crash or stop responding. This problem appears in the listed Ubuntu kernel packages. Updating to the latest kernel version from Ubuntu resolves the issue.
What to do
- Update canonical linux-aws-6.17 to version 6.17.0-1007.7~24.04.1.
- Update canonical linux-gcp-6.17 to version 6.17.0-1008.8~24.04.1.
- Update canonical linux-nvidia-6.17 to version 6.17.0-1008.8.
- Update canonical linux-oem-6.17 to version 6.17.0-1011.11.
- Update canonical linux-oracle-6.17 to version 6.17.0-1007.7~24.04.1.
- Update canonical linux-realtime-6.17 to version 6.17.0-1006.7~24.04.1.
- Update canonical linux to version 6.17.0-14.14.
- Update canonical linux-aws to version 6.17.0-1007.7.
- Update canonical linux-azure to version 6.17.0-1008.8.
- Update canonical linux-gcp to version 6.17.0-1007.7.
- Update canonical linux-oracle to version 6.17.0-1007.7.
- Update canonical linux-raspi to version 6.17.0-1008.8.
- Update canonical linux-realtime to version 6.17.0-1006.7.
- Update canonical linux-riscv to version 6.17.0-14.14.1.
- Update linux kernel to version 6.17.3.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:16.04:LTS | canonical | linux-hwe-edge | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-edge | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-4.15 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gkeop-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-hwe | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oem | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.3 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-fde | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-intel-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.10 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.14 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.6 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-raspi2 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-allwinner-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.2 | All versions |
Showing 50 of 99. Show the rest
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:22.04:LTS | canonical | linux-azure-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-intel-iot-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-5.17 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.0 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.1 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oracle-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.5 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-aws-6.17 |
< 6.17.0-1007.7~24.04.1 Fix: upgrade to 6.17.0-1007.7~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-azure-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.17 |
< 6.17.0-1008.8~24.04.1 Fix: upgrade to 6.17.0-1008.8~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-lowlatency-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-6.17 |
< 6.17.0-1008.8 Fix: upgrade to 6.17.0-1008.8
|
| Ubuntu:24.04:LTS | canonical | linux-oem-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.17 |
< 6.17.0-1011.11 Fix: upgrade to 6.17.0-1011.11
|
| Ubuntu:24.04:LTS | canonical | linux-oem-6.8 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oracle-6.17 |
< 6.17.0-1007.7~24.04.1 Fix: upgrade to 6.17.0-1007.7~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-raspi-realtime | All versions |
| Ubuntu:Nvidia-BlueField:24.04:LTS | canonical | linux-bluefield | All versions |
| Ubuntu:Pro:Realtime:24.04:LTS | canonical | linux-realtime-6.17 |
< 6.17.0-1006.7~24.04.1 Fix: upgrade to 6.17.0-1006.7~24.04.1
|
| Ubuntu:25.10 | canonical | linux |
< 6.17.0-14.14 Fix: upgrade to 6.17.0-14.14
|
| Ubuntu:25.10 | canonical | linux-aws |
< 6.17.0-1007.7 Fix: upgrade to 6.17.0-1007.7
|
| Ubuntu:25.10 | canonical | linux-azure |
< 6.17.0-1008.8 Fix: upgrade to 6.17.0-1008.8
|
| Ubuntu:25.10 | canonical | linux-gcp |
< 6.17.0-1007.7 Fix: upgrade to 6.17.0-1007.7
|
| Ubuntu:25.10 | canonical | linux-oracle |
< 6.17.0-1007.7 Fix: upgrade to 6.17.0-1007.7
|
| Ubuntu:25.10 | canonical | linux-raspi |
< 6.17.0-1008.8 Fix: upgrade to 6.17.0-1008.8
|
| Ubuntu:25.10 | canonical | linux-realtime |
< 6.17.0-1006.7 Fix: upgrade to 6.17.0-1006.7
|
| Ubuntu:25.10 | canonical | linux-riscv |
< 6.17.0-14.14.1 Fix: upgrade to 6.17.0-14.14.1
|
| Linux | linux | kernel |
>= 6.17.0, < 6.17.3 Fix: upgrade to 6.17.3
|
Original advisory text
f2fs: fix to avoid NULL pointer dereference in f2fs_check_quota_consistency()
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to avoid NULL pointer dereference in f2fs_check_quota_consistency()
syzbot reported a f2fs bug as below:
Oops: gen[ 107.736417][ T5848] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5848 Comm: syz-executor263 Tainted: G W 6.17.0-rc1-syzkaller-00014-g0e39a731820a #0 PREEMPT_{RT,(full)}
RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
Call Trace:
<TASK>
f2fs_check_quota_consistency fs/f2fs/super.c:1188 [inline]
f2fs_check_opt_consistency+0x1378/0x2c10 fs/f2fs/super.c:1436
__f2fs_remount fs/f2fs/super.c:2653 [inline]
f2fs_reconfigure+0x482/0x1770 fs/f2fs/super.c:5297
reconfigure_super+0x224/0x890 fs/super.c:1077
do_remount fs/namespace.c:3314 [inline]
path_mount+0xd18/0xfe0 fs/namespace.c:4112
do_mount fs/namespace.c:4133 [inline]
__do_sys_mount fs/namespace.c:4344 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4321
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The direct reason is f2fs_check_quota_consistency() may suffer null-ptr-deref
issue in strcmp().
The bug can be reproduced w/ below scripts:
mkfs.f2fs -f /dev/vdb
mount -t f2fs -o usrquota /dev/vdb /mnt/f2fs
quotacheck -uc /mnt/f2fs/
umount /mnt/f2fs
mount -t f2fs -o usrjquota=aquota.user,jqfmt=vfsold /dev/vdb /mnt/f2fs
mount -t f2fs -o remount,usrjquota=,jqfmt=vfsold /dev/vdb /mnt/f2fs
umount /mnt/f2fs
So, before old_qname and new_qname comparison, we need to check whether
they are all valid pointers, fix it.
f2fs: fix to avoid NULL pointer dereference in f2fs_check_quota_consistency()
syzbot reported a f2fs bug as below:
Oops: gen[ 107.736417][ T5848] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5848 Comm: syz-executor263 Tainted: G W 6.17.0-rc1-syzkaller-00014-g0e39a731820a #0 PREEMPT_{RT,(full)}
RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
Call Trace:
<TASK>
f2fs_check_quota_consistency fs/f2fs/super.c:1188 [inline]
f2fs_check_opt_consistency+0x1378/0x2c10 fs/f2fs/super.c:1436
__f2fs_remount fs/f2fs/super.c:2653 [inline]
f2fs_reconfigure+0x482/0x1770 fs/f2fs/super.c:5297
reconfigure_super+0x224/0x890 fs/super.c:1077
do_remount fs/namespace.c:3314 [inline]
path_mount+0xd18/0xfe0 fs/namespace.c:4112
do_mount fs/namespace.c:4133 [inline]
__do_sys_mount fs/namespace.c:4344 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4321
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The direct reason is f2fs_check_quota_consistency() may suffer null-ptr-deref
issue in strcmp().
The bug can be reproduced w/ below scripts:
mkfs.f2fs -f /dev/vdb
mount -t f2fs -o usrquota /dev/vdb /mnt/f2fs
quotacheck -uc /mnt/f2fs/
umount /mnt/f2fs
mount -t f2fs -o usrjquota=aquota.user,jqfmt=vfsold /dev/vdb /mnt/f2fs
mount -t f2fs -o remount,usrjquota=,jqfmt=vfsold /dev/vdb /mnt/f2fs
umount /mnt/f2fs
So, before old_qname and new_qname comparison, we need to check whether
they are all valid pointers, fix it.
References
- https://git.kernel.org/stable/c/3f3458852bbfe79c60f2412b8b04677b96688b6e URL
- https://ubuntu.com/security/CVE-2025-40138 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2025-40138 Third Party Advisory
- https://git.kernel.org/linus/930a9a6ee8e7ffa20af4bffbfc2bbd21d83bf81c Third Party Advisory
- https://ubuntu.com/security/notices/USN-8029-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8030-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8029-2 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8048-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8029-3 Vendor Advisory
- https://git.kernel.org/stable/c/930a9a6ee8e7ffa20af4bffbfc2bbd21d83bf81c URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40138... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-40138 Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
Timeline
Published12 Nov 2025
Updated29 Oct 2026
First seen7 Mar 2026
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