Improper Validation of Specified Quantity in Input Affecting kernel-modules-extra package, versions *


Severity

Recommended
low

Based on CentOS security rating.

Threat Intelligence

EPSS
0.18% (7th percentile)

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  • Snyk IDSNYK-CENTOS10-KERNELMODULESEXTRA-20208549
  • published29 Sept 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

NewCVE-2026-98127  (opens in a new tab)
CWE-1284  (opens in a new tab)

How to fix?

There is no fixed version for Centos:10 kernel-modules-extra.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-modules-extra package and not the kernel-modules-extra package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

smb/client: validate new EOF for insert range

smb3_insert_range() does not check if the new file size (i_size + len) is valid. This allows FALLOC_FL_INSERT_RANGE to bypass RLIMIT_FSIZE, exceed s_maxbytes, or produce a size outside the loff_t range.

Use check_add_overflow() to calculate the new EOF. Validate it with inode_newsize_ok() before modifying the file.

Reproducer, using a file on a CIFS mount:

bash -c '
    FILE=/mnt/cifs/repro

trap "" SIGXFSZ
ulimit -f 3072		# RLIMIT_FSIZE = 3 MiB

# A regular write is stopped at 3 MiB.
dd if=/dev/zero of="$FILE" bs=1M count=4 status=none
stat -c "size after write: %s" "$FILE"

# Insert 2 MiB into a 2 MiB file.
truncate -s 2M "$FILE"
fallocate -i -o 0 -l 2M "$FILE"
stat -c "size after insert: %s" "$FILE"

'

Before this change, the regular write stops at the 3 MiB limit, but insert range grows the file to 4 MiB:

dd: error writing '/mnt/cifs/repro': File too large
size after write: 3145728
size after insert: 4194304

After this change, insert range also fails at the limit and leaves the 2 MiB file unchanged:

dd: error writing '/mnt/cifs/repro': File too large
size after write: 3145728
fallocate: fallocate failed: File too large
size after insert: 2097152

CVSS Base Scores

version 3.1