CVE-2026-98126smb/client: validate new EOF for zero range
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: smb/client: validate new EOF for zero range When FALLOC_FL_ZERO_RANGE is used without FALLOC_FL_KEEP_SIZE, smb3_zero_range() may extend EOF without checking RLIMIT_FSIZE, allowing the file to grow beyond the caller's file-size limit. Fix this by calling inode_newsize_ok() before sending the zero-range request when the operation would extend EOF. Reproducer, using a file on a CIFS mount: bash -c ' FILE=/mnt/cifs/repro trap "" SIGXFSZ ulimit -f 3072 truncate -s 2M "$FILE" fallocate --zero-range -o 0 -l 4M "$FILE" echo "fallocate rc=$?" stat -c "file size=%s" "$FILE" ' Before this change, the operation succeeds despite the 3 MiB limit: fallocate rc=0 file size=4194304 After this change, fallocate fails and leaves the file at 2 MiB.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 3673f057b64abfa957e8ae84448db69369a5091a; 72c419d9b073628d3b5b0b2fc787b724f1a8c726 builds before 06a4f9049cb6dc319bceec2dc813ba89add8b828; from 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before f320ca20c273a26cd779bdb2b2e4b076a95c76f6; from 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 88972e35750792e717af287dc71f42a03b5cbce4 | CNA record |
References
- https://git.kernel.org/stable/c/3673f057b64abfa957e8ae84448db69369a5091a
- https://git.kernel.org/stable/c/06a4f9049cb6dc319bceec2dc813ba89add8b828
- https://git.kernel.org/stable/c/f320ca20c273a26cd779bdb2b2e4b076a95c76f6
- https://git.kernel.org/stable/c/88972e35750792e717af287dc71f42a03b5cbce4
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.