CVE-2026-90199
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
Vulnerability in the ntfs3 filesystem driver in the Linux kernel. In the mi_enum_attr() function, insufficient validation of the end virtual cluster number (evcn) can lead to integer overflow, allowing invalid attributes to be accepted. The fix adds a range check for evcn, rejecting values outside the range, except for U64_MAX which is used as a sentinel for empty attributes.
Risk Assessment
An attacker could supply a malicious NTFS image that exploits this flaw, potentially leading to memory corruption or other security issues on the system.
Recommendation
Apply the kernel patch that fixes the validation in fs/ntfs3 or update to a kernel version that includes this mitigation.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject out-of-range evcn in mi_enum_attr() In mi_enum_attr(), the start/end VCN validation for non-resident attributes is: if (svcn > evcn + 1) goto out; When evcn is U64_MAX the "evcn + 1" expression wraps to 0 and any svcn passes the check. For evcn values close to U64_MAX (but not equal to it) the right-hand side is still a meaningless near-wrap upper bound, so a malformed on-disk attribute with svcn == 0 and evcn near U64_MAX can pass mi_enum_attr() unrejected. VCN (virtual cluster number) is a cluster index, so any valid evcn is bounded by the volume's total cluster count, which ntfs3 holds in sbi->used.bitmap.nbits (set up in ntfs_init_from_boot() before any caller of mi_enum_attr() runs). Reject evcn values that fall outside this range. However, an empty non-resident attribute (no allocated clusters) is legitimately encoded with svcn == 0 and evcn == -1 (U64_MAX), e.g. via attr->nres.evcn = cpu_to_le64((u64)vcn - 1) with vcn == 0. That sentinel must keep passing, so exclude evcn == U64_MAX from the range check. The existing "svcn > evcn + 1" test still tolerates the sentinel ("0 > 0" is false) and continues to require svcn == 0 for it, while the range check rejects every other out-of-range evcn and thereby also defuses the "evcn + 1" wraparound. svcn does not need its own bound: once evcn < nbits, "svcn > evcn + 1" implies svcn <= nbits. [[email protected]: fixed evcn check]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS