CVE-2026-23233
published 2026-03-04CVE-2026-23233: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid mapping wrong physical block for swapfile Xiaolong Guo reported a f2fs…
PriorityP341high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.16%
5.6th percentile
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to avoid mapping wrong physical block for swapfile
Xiaolong Guo reported a f2fs bug in bugzilla [1]
[1] https://bugzilla.kernel.org/show_bug.cgi?id=220951
Quoted:
"When using stress-ng's swap stress test on F2FS filesystem with kernel 6.6+,
the system experiences data corruption leading to either:
1 dm-verity corruption errors and device reboot
2 F2FS node corruption errors and boot hangs
The issue occurs specifically when:
1 Using F2FS filesystem (ext4 is unaffected)
2 Swapfile size is less than F2FS section size (2MB)
3 Swapfile has fragmented physical layout (multiple non-contiguous extents)
4 Kernel version is 6.6+ (6.1 is unaffected)
The root cause is in check_swap_activate() function in fs/f2fs/data.c. When the
first extent of a small swapfile (main_blkaddr) % blks_per_sec ||
nr_pblocks % blks_per_sec ||
!f2fs_valid_pinned_area(sbi, pblock)) {
bool last_extent = false;
not_aligned++;
nr_pblocks = roundup(nr_pblocks, blks_per_sec);
if (cur_lblock + nr_pblocks > sis->max)
nr_pblocks -= blks_per_sec;
/* this extent is last one */
if (!nr_pblocks) {
nr_pblocks = last_lblock - cur_lblock;
last_extent = true;
}
ret = f2fs_migrate_blocks(inode, cur_lblock, nr_pblocks);
if (ret) {
if (ret == -ENOENT)
ret = -EINVAL;
goto out;
}
if (!last_extent)
goto retry;
}
When the first extent is unaligned and roundup(nr_pblocks, blks_per_sec)
exceeds sis->max, we subtract blks_per_sec resulting in nr_pblocks = 0. The
code then incorrectly assumes this is the last extent, sets nr_pblocks =
last_lblock - cur_lblock (entire swapfile), and performs migration. After
migration, it doesn't retry mapping, so subsequent extents are never processed.
"
In order to fix this issue, we need to lookup block mapping info after
we migrate all blocks in the tail of swapfile.
Affected
46 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.18.13-1 (forky) | linux 6.18.13-1 (forky) |
| linux | linux | — | — |
| linux | linux | >= 40d76c393cca83938b11eb7ca8983aa3cd0ed69b < d4534a7f6c92baaf7e12a45fc6e37332cafafc33 | d4534a7f6c92baaf7e12a45fc6e37332cafafc33 |
| linux | linux | >= 6.6.33 < 6.6.127 | 6.6.127 |
| linux | linux | >= 9703d69d9d153bb230711d0d577454552aeb13d4 < 1ff415eef513bf12deb058fc50d57788c46c48e6 | 1ff415eef513bf12deb058fc50d57788c46c48e6 |
| linux | linux | >= 9703d69d9d153bb230711d0d577454552aeb13d4 < fee27b69dde1a05908b350eea42937af2387c4fe | fee27b69dde1a05908b350eea42937af2387c4fe |
| linux | linux | >= 9703d69d9d153bb230711d0d577454552aeb13d4 < 607cb9d83838d2cd9f0406c2403ed61aadf0edff | 607cb9d83838d2cd9f0406c2403ed61aadf0edff |
| linux | linux | >= 9703d69d9d153bb230711d0d577454552aeb13d4 < 5c145c03188bc9ba1c29e0bc4d527a5978fc47f9 | 5c145c03188bc9ba1c29e0bc4d527a5978fc47f9 |
| linux | linux_kernel | >= 0 < 6.12.74-2 | 6.12.74-2 |
| linux | linux_kernel | >= 0 < 6.18.13-1 | 6.18.13-1 |
| linux | linux_kernel | >= 6.13 < 6.18.13 | 6.18.13 |
| linux | linux_kernel | >= 6.19 < 6.19.3 | 6.19.3 |
| linux | linux_kernel | >= 6.6.33 < 6.6.127 | 6.6.127 |
| linux | linux_kernel | >= 6.9 < 6.12.74 | 6.12.74 |
| msrc | azl3_kernel_6.6.126.1-1_on_azure_linux_3.0 | — | — |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-6.8 | — | — |
| ubuntu | linux-azure-fde | — | — |
| ubuntu | linux-azure-fde-6.8 | — | — |
| ubuntu | linux-azure-fips | — | — |
| ubuntu | linux-fips | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian7.8LOW
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
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It was discovered that some AMD Zen 2 processors did not properly isolate
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level, resulting in privilege escalation. (CVE-2025-54518)
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- PowerPC architecture;
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- Cryptographic API;
- ACPI drivers;
- ATM drivers;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
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Microsoft
f2fs: fix to avoid mapping wrong physical block for swapfile
vendor_msrc·2026-03-10·CVSS 7.8
CVE-2026-23233 [HIGH] f2fs: fix to avoid mapping wrong physical block for swapfile
f2fs: fix to avoid mapping wrong physical block for swapfile
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade
Red Hat
kernel: f2fs: fix to avoid mapping wrong physical block for swapfile
vendor_redhat·2026-03-04·CVSS 7.8
CVE-2026-23233 [HIGH] kernel: f2fs: fix to avoid mapping wrong physical block for swapfile
kernel: f2fs: fix to avoid mapping wrong physical block for swapfile
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to avoid mapping wrong physical block for swapfile
Xiaolong Guo reported a f2fs bug in bugzilla [1]
[1] https://bugzilla.kernel.org/show_bug.cgi?id=220951
Quoted:
"When using stress-ng's swap stress test on F2FS filesystem with kernel 6.6+,
the system experiences data corruption leading to either:
1 dm-verity corruption errors and device reboot
2 F2FS node corruption errors and boot hangs
The issue occurs specifically when:
1 Using F2FS filesystem (ext4 is unaffected)
2 Swapfile size is less than F2FS section size (2MB)
3 Swapfile has fragmented physical layout (multiple non-contiguous extents)
4 Kernel version is 6.6+ (6.1 is unaffected)
The r
Debian
CVE-2026-23233: linux - In the Linux kernel, the following vulnerability has been resolved: f2fs: fix t...
vendor_debian·2026·CVSS 7.8
CVE-2026-23233 [HIGH] CVE-2026-23233: linux - In the Linux kernel, the following vulnerability has been resolved: f2fs: fix t...
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid mapping wrong physical block for swapfile Xiaolong Guo reported a f2fs bug in bugzilla [1] [1] https://bugzilla.kernel.org/show_bug.cgi?id=220951 Quoted: "When using stress-ng's swap stress test on F2FS filesystem with kernel 6.6+, the system experiences data corruption leading to either: 1 dm-verity corruption errors and device reboot 2 F2FS node corruption errors and boot hangs The issue occurs specifically when: 1 Using F2FS filesystem (ext4 is unaffected) 2 Swapfile size is less than F2FS section size (2MB) 3 Swapfile has fragmented physical layout (multiple non-contiguous extents) 4 Kernel version is 6.6+ (6.1 is unaffected) The root cause is in check_swap_activate() function in fs/f2fs/data.c. When
VulDB
Linux Kernel up to 6.6.126/6.12.73/6.18.12/6.19.2 F2FS fs/f2fs/data.c denial of service (Nessus ID 301080 / WID-SEC-2026-0614)
vuldb·2026-04-29·CVSS 7.8
CVE-2026-23233 [HIGH] Linux Kernel up to 6.6.126/6.12.73/6.18.12/6.19.2 F2FS fs/f2fs/data.c denial of service (Nessus ID 301080 / WID-SEC-2026-0614)
A vulnerability was found in Linux Kernel up to 6.6.126/6.12.73/6.18.12/6.19.2 and classified as critical. This affects an unknown function of the file fs/f2fs/data.c of the component F2FS. Executing a manipulation can lead to denial of service.
This vulnerability is registered as CVE-2026-23233. The attack requires access to the local network. No exploit is available.
It is suggested to upgrade the affected component.
GHSA
GHSA-p99w-mp33-jg8x: In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to avoid mapping wrong physical block for swapfile
Xiaolong Guo report
ghsa_unreviewed·2026-03-04
CVE-2026-23233 [HIGH] CWE-787 GHSA-p99w-mp33-jg8x: In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to avoid mapping wrong physical block for swapfile
Xiaolong Guo report
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to avoid mapping wrong physical block for swapfile
Xiaolong Guo reported a f2fs bug in bugzilla [1]
[1] https://bugzilla.kernel.org/show_bug.cgi?id=220951
Quoted:
"When using stress-ng's swap stress test on F2FS filesystem with kernel 6.6+,
the system experiences data corruption leading to either:
1 dm-verity corruption errors and device reboot
2 F2FS node corruption errors and boot hangs
The issue occurs specifically when:
1 Using F2FS filesystem (ext4 is unaffected)
2 Swapfile size is less than F2FS section size (2MB)
3 Swapfile has fragmented physical layout (multiple non-contiguous extents)
4 Kernel version is 6.6+ (6.1 is unaffected)
The root cause is in check_swap_activate() function in fs/f2fs/data.
OSV
CVE-2026-23233: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid mapping wrong physical block for swapfile Xiaolong Guo reported
osv·2026-03-04·CVSS 7.8
CVE-2026-23233 [HIGH] CVE-2026-23233: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid mapping wrong physical block for swapfile Xiaolong Guo reported
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid mapping wrong physical block for swapfile Xiaolong Guo reported a f2fs bug in bugzilla [1] [1] https://bugzilla.kernel.org/show_bug.cgi?id=220951 Quoted: "When using stress-ng's swap stress test on F2FS filesystem with kernel 6.6+, the system experiences data corruption leading to either: 1 dm-verity corruption errors and device reboot 2 F2FS node corruption errors and boot hangs The issue occurs specifically when: 1 Using F2FS filesystem (ext4 is unaffected) 2 Swapfile size is less than F2FS section size (2MB) 3 Swapfile has fragmented physical layout (multiple non-contiguous extents) 4 Kernel version is 6.6+ (6.1 is unaffected) The root cause is in check_swap_activate() function in fs/f2fs/data.c. When
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/1ff415eef513bf12deb058fc50d57788c46c48e6https://git.kernel.org/stable/c/5c145c03188bc9ba1c29e0bc4d527a5978fc47f9https://git.kernel.org/stable/c/607cb9d83838d2cd9f0406c2403ed61aadf0edffhttps://git.kernel.org/stable/c/d4534a7f6c92baaf7e12a45fc6e37332cafafc33https://git.kernel.org/stable/c/fee27b69dde1a05908b350eea42937af2387c4fe
2026-03-04
Published