CVE-2026-90199fs/ntfs3: reject out-of-range evcn in mi_enum_attr()
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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]
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 32 days later
· 32 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 – < 0441e34ce098c19185a7b52c5b8b89a8a5b26888
- affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 – < 7ab69cef49ebdfee288287d62641b24ab1445ecc
- affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 – < ce9a619c432b9a4044fee115c5483fbed946c131
- affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 – < 2b9a0e57bfd365e2096706b19ae34dce3b4a884b
- affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 – < 20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3
- affected a7accf181a4709a6e380360372150cc4a1b6b89a
- affected 3dfd727873c3e8da74a2e3907120ff052c5f0bcc
- affected 1d7dd485108d4f633b543c9c14071cc325b68ae5
- affected 5.15.209 – < 5.16
- affected 6.1.115 – < 6.2
- affected 6.5.11 – < 6.6
- affected 6.6
- unaffected < 6.6
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888 (opens in a new tab)
- https://git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc (opens in a new tab)
- https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131 (opens in a new tab)
- https://git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b (opens in a new tab)
- https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-81792 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-90199)Record last updated .