CVE-2025-40137: f2fs: fix to truncate first page in error path of f2fs_truncate()
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to truncate first page in error path of f2fstruncate()
syzbot reports a bug as below:
loop0: detected capacity change from 0 to 40427 F2FS-fs (loop0): Wrong SSA boundary, start(3584) end(4096) blocks(3072) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop0): invalid crc value F2FS-fs (loop0): f2fsconvertinlinefolio: corrupted inline inode ino=3, iaddr[0]:0x1601, run fsck to fix. ------------[ cut here ]------------ kernel BUG at fs/inode.c:753! RIP: 0010:clearinode+0x169/0x190 fs/inode.c:753 Call Trace: <TASK> evict+0x504/0x9c0 fs/inode.c:810 f2fsfillsuper+0x5612/0x6fa0 fs/f2fs/super.c:5047 gettreebdevflags+0x40e/0x4d0 fs/super.c:1692 vfsgettree+0x8f/0x2b0 fs/super.c:1815 donewmount+0x2a2/0x9e0 fs/namespace.c:3808 domount fs/namespace.c:4136 [inline] dosysmount fs/namespace.c:4347 [inline] sesysmount+0x317/0x410 fs/namespace.c:4324 dosyscallx64 arch/x86/entry/syscall64.c:63 [inline] dosyscall64+0xfa/0x3b0 arch/x86/entry/syscall64.c:94 entrySYSCALL64afterhwframe+0x77/0x7f
During f2fsevictinode(), clearinode() detects that we missed to truncate all page cache before destorying inode, that is because in below path, we will create page #0 in cache, but missed to drop it in error path, let's fix it.
- evict - f2fsevictinode - f2fstruncate - f2fsconvertinlineinode - f2fsgrabcachefolio : create page #0 in cache - f2fsconvertinlinefolio : sanity check failed, return -EFSCORRUPTED - clearinode detects that inode->idata.nrpages is not zero
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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debian/linuxto a version that resolves this vulnerability.Fixed in 6.12.57-1 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.1.191 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.12.53 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.17.3 - Upgrade
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debian/linuxto a version that resolves this vulnerability.Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1 - Upgrade
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ubuntu/linux-aws-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1050.53~22.04.1 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.8.0-1050.53 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1049.52 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.8.0-1047.48 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.8.0-1050.54 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1052.55+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.17.0-14.14 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.17.0-1007.7 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.17.0-1008.8 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.17.0-1007.7 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.17.0-1007.7 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.17.0-1008.8 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 6.17.0-1006.7 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 6.17.0-14.14.1
Event History
Frequently Asked Questions
What is the severity of CVE-2025-40137?
CVE-2025-40137 is classified as a moderate severity vulnerability in the Linux kernel.
How do I fix CVE-2025-40137?
To fix CVE-2025-40137, you should update your Linux kernel to the latest stable version where this vulnerability has been addressed.
What does CVE-2025-40137 affect?
CVE-2025-40137 affects the f2fs implementation in the Linux kernel.
What is the impact of CVE-2025-40137?
The impact of CVE-2025-40137 includes potential data loss due to improper handling of SSA boundaries during truncation.
Is CVE-2025-40137 a critical vulnerability?
No, CVE-2025-40137 is not considered critical, but it may lead to data integrity issues if left unaddressed.