Linux kernel is core infrastructure; an ntfs3 kernel-level overflow can enable widespread RCE/privilege escalation across many systems and distributions.
CVE-2026-89615
ntfs3 kernel bug allows kernel memory corruption, escalation or DoS
Is CVE-2026-89615 being exploited?
Not confirmed. CVE-2026-89615 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-89615?
CVE-2026-89615 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-89615?
Yes. A fix has been recorded for CVE-2026-89615. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-89615 affect?
CVE-2026-89615 affects Linux kernel (ntfs3 filesystem driver), Linux distributions with affected kernel versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-89615?
Apply kernel updates containing the ntfs3 fix; avoid mounting untrusted NTFS media until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Out-of-bounds write in ntfs3 via crafted NTFS log record -> kernel memory corruption enabling RCE, local privilege escalation, or DoS when processing/mounting volumes.
Immediate action required
- affected>= b46acd6a6a627d876898e1c84d3f84902264b445 and < f4c1bc6d7331f344ffcea93c2a37badcbe15baa6
- affected>= b46acd6a6a627d876898e1c84d3f84902264b445 and < 7ccb94901f38a062034b56b43c774050b113758f
- affected>= b46acd6a6a627d876898e1c84d3f84902264b445 and < 1135ebc225996b3ac1a295652b19a0a706737a6c
- affected>= b46acd6a6a627d876898e1c84d3f84902264b445 and < 6f7b9dbdc1b7520206abce0049bdd143eb536e75
- affected5.15
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.