cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0 With len == 0 (clone to EOF), the effective length is computed as: len = src_inode->i_size - off; If off > i_size, this is a negative loff_t, corrupting the ByteCount in the FSCTL_DUPLICATE_EXTENTS_TO_FILE request and inverting the range in filemap_write_and_wait_range(). The existing off >= i_size check fires only after the ioctl has already been sent. Snapshot i_size_read() once for both the bounds check and the length calculation, eliminating the TOCTOU and 32-bit torn-read risk. Reject off > src_size with -EINVAL. Treat off == src_size as a no-op, consistent with __generic_remap_file_range_prep().
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 04b38d601239b4d9be641b412cf4b7456a041c67 · fixed in f3d1ae1e6bc4a9f559185b6e7bd2b6375ec2fdd4; From 04b38d601239b4d9be641b412cf4b7456a041c67 · fixed in 7f62817fe049b0f3652518c1ba72631ec1e0a322; From 04b38d601239b4d9be641b412cf4b7456a041c67 · fixed in b098f5e5858797827666e6cd73033f52fc39b5f6; From 04b38d601239b4d9be641b412cf4b7456a041c67 · fixed in c2a0dcb5a7a1516aa6eb6d5cedca6a8e76527028; From 04b38d601239b4d9be641b412cf4b7456a041c67 · fixed in b057ca17b656345d04669cb87f2aff9b31d873db; From 04b38d601239b4d9be641b412cf4b7456a041c67 · fixed in 6c322f5cf7476ded7a9a20f7be72462065a03c68
- Linux Linux
4.5
- KernelLinux
From 4.5.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4