CVE-2026-98126 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-DEBIAN12-LINUX612-20506506
  • published5 Oct 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

NewCVE-2026-98126  (opens in a new tab)

How to fix?

Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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 &#39;
        FILE=/mnt/cifs/repro

    trap &amp;#34;&amp;#34; SIGXFSZ
    ulimit -f 3072

    truncate -s 2M &amp;#34;$FILE&amp;#34;
    fallocate --zero-range -o 0 -l 4M &amp;#34;$FILE&amp;#34;
    echo &amp;#34;fallocate rc=$?&amp;#34;
    stat -c &amp;#34;file size=%s&amp;#34; &amp;#34;$FILE&amp;#34;

&#39;

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 Base Scores

version 3.1