CVE-2026-89838: f2fs: limit recovery filename logging to stored length
In the Linux kernel, the following vulnerability has been resolved:
f2fs: limit recovery filename logging to stored length
F2FS stores recovery filenames as a length plus a fixed-size iname buffer. The buffer is not NUL-terminated, but recoverinode() and recoverdentry() print it with %s.
For a 255-byte filename, recovery logging can read past iname into the following raw inode fields.
Print the name with a precision bounded by inamelen and F2FSNAMELEN.
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 6.12.113-1 - Upgrade
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debian/linuxto a version that resolves this vulnerability.Fixed in 7.2.6-1 - Upgrade
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debian/linux-6.12to a version that resolves this vulnerability.Fixed in 6.12.113-1~deb12u1 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 5.10.273 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 5.15.224 - 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 6.6.160 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.12.112 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.18.53 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 7.2.5 - Upgrade
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debian/linuxto a version that resolves this vulnerability.Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1 - Upgrade
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ubuntu/linux-hwe-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-42.42~24.04.1 - Upgrade
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ubuntu/linux-riscv-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1~24.04.1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 7.0.0-42.42 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 7.0.0-1016.17 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 7.0.0-1016.18 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 7.0.0-1017.17 - Upgrade
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ubuntu/linux-oem-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-1017.17 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 7.0.0-1015.16 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1
Event History
Frequently Asked Questions
What conditions are required for the out-of-bounds read to occur?
F2FS recovery must process an inode or directory entry whose recovery filename is 255 bytes long. The vulnerable logging paths are recover_inode() and recover_dentry(), which print the non-NUL-terminated name buffer with %s.
What data could be exposed by the vulnerable logging?
Logging may read beyond the fixed-size i_name buffer and include bytes from raw inode fields that follow it in memory. The provided data describes an information disclosure through recovery filename logging, not a write or code-execution condition.
How is the issue fixed?
The fix prints recovery filenames using a precision bounded by both i_namelen and F2FS_NAME_LEN, rather than treating the stored buffer as a NUL-terminated string. The referenced stable kernel commits contain the remediation.