CVE-2026-98126
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.
Affected versions
Linux kernel versions
5.1
and later are affected. Fixed in
6.12.111,
6.18.53,
7.2.7,
7.3-rc2
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-98126?
CVE-2026-98126 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.1 onward and has been patched in 6.12.111, 6.18.53, 7.2.7 and others. CVE-2026-98126 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98126?
Yes. CVE-2026-98126 has been patched. Fixed versions include 6.12.111, 6.18.53, 7.2.7 and others. If you are running Linux kernel 5.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98126 actively exploited?
No. CVE-2026-98126 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.