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Vulnerability record · CVE-2026-98126 · published 25 September 2026

CVE-2026-98126: Linux kernel allocation without limits vulnerability

Linux · Linux Kernel

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.

5.5 CVSS 3.1 Medium EPSS 0.12% · top 98.0% CWE-770 · Allocation without limits
5.5CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
22 Oct 2026Last modified by NVD

Description

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-98126), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.