Medium 5.5Published Sep 25, 2026

CVE-2026-98126smb/client: validate new EOF for zero range

Updated under an hour ago (Oct 27, 2026, 11:40 AM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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: Analyzed
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	72c419d9b073628d3b5b0b2fc787b724f1a8c726 builds before 5fbd8848f2e25c8163896ec52863df2305a3bb63; from 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 3673f057b64abfa957e8ae84448db69369a5091a; 72c419d9b073628d3b5b0b2fc787b724f1a8c726 builds before 06a4f9049cb6dc319bceec2dc813ba89add8b828; from 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before f320ca20c273a26cd779bdb2b2e4b076a95c76f6; from 72c419d9b073628d3b5b0b2fc787b724f1a8c726 before 88972e35750792e717af287dc71f42a03b5cbce4	CNA record
linux linux_kernel linux:linux_kernel	from 5.1 before 6.6.160; from 6.7 before 6.12.111; from 6.13 before 6.18.53; from 6.19 before 7.2.7; 7.3	NVD

References

References

https://git.kernel.org/stable/c/5fbd8848f2e25c8163896ec52863df2305a3bb63	patch
https://git.kernel.org/stable/c/3673f057b64abfa957e8ae84448db69369a5091a	patch
https://git.kernel.org/stable/c/06a4f9049cb6dc319bceec2dc813ba89add8b828	patch
https://git.kernel.org/stable/c/f320ca20c273a26cd779bdb2b2e4b076a95c76f6	patch
https://git.kernel.org/stable/c/88972e35750792e717af287dc71f42a03b5cbce4	patch

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.