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CVE-2026-98126

5.5 medium Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 5

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 9

  1. CwesCWE-770NVD modified 2026-10-22 16:02
  2. Cpes+2 CPE criteria (now 2)NVD modified 2026-10-22 16:02
  3. StatusPublished → AnalyzedNVD modified 2026-10-22 16:02
  4. CVSS5.5 (v3.1, CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)NVD modified 2026-10-22 16:02
  5. StatusUndergoing Analysis → PublishedNVD modified 2026-10-21 12:54
  6. References+1 references (now 5)NVD modified 2026-10-21 13:21
  7. StatusPublished → Undergoing AnalysisNVD modified 2026-10-21 13:21
  8. StatusUndergoing Analysis → PublishedNVD modified 2026-10-19 09:14
  9. First seenunscoredNVD modified 2026-10-19 10:18

Affected (CPE criteria) 2

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:*

References 5