CVE-2026-46062 (CVSS 7.8)

Description

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix integer overflow in run_unpack() volume boundary check The volume boundary check `lcn + len > sbi->used.bitmap.nbits` uses raw addition which can wrap around for large lcn and len values, bypassing the validation. Use check_add_overflow() as is already done for the adjacent prev_lcn + dlcn and vcn64 + len checks added by commit 3ac37e100385 ("ntfs3: Fix integer overflow in run_unpack()"). Found by fuzzing with a source-patched harness (LibAFL + QEMU).

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CVSS v3.1 Score

7.8

HIGH

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

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/424858f9a048057bb8f834bfe03d18f5e477e747 https://git.kernel.org/stable/c/60dab3e2931f3d792438a77a6cb0cb731c43300b https://git.kernel.org/stable/c/6175d09c23bec4b60860ee9a0170308ff4b56e10 https://git.kernel.org/stable/c/984a415f019536ea2d24de9010744e5302a9a948 https://git.kernel.org/stable/c/a954061b334ec67c79ae9d0cadd83fa521396487 https://git.kernel.org/stable/c/e73cd5aed6b15e55c1c47577bdb473b5e88d6a69 https://git.kernel.org/stable/c/f1af27cec07a9fd0847166bdb23c99e86b05bfdc

Frequently Asked Questions

What is CVE-2026-46062? +

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix integer overflow in run_unpack() volume boundary check The volume boundary check `lcn + len > sbi->used.bitmap.nbits` uses raw addition which can wrap around for large lcn and len values, bypassing the validation. Use check_add_overflow() as is already done for the adjacent prev_lcn + dlcn and vcn64 + len checks added by commit 3ac37e100385 ("ntfs3: Fix integer overflow in run_unpack()"). Found by fuzzing with a source-patched harness (LibAFL + QEMU). It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-46062? +

CVE-2026-46062 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0014, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-46062? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-46062