CVE-2026-74608
Use-after-free in Linux CIFS/SMB client can cause kernel memory corruption.
Is CVE-2026-74608 being exploited?
Not confirmed. CVE-2026-74608 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 0.48% probability of exploitation in the next 30 days.
How severe is CVE-2026-74608?
CVE-2026-74608 is rated Critical with a CVSS score of 9.8. 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-2026-74608?
Yes. A fix has been recorded for CVE-2026-74608. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74608 affect?
CVE-2026-74608 affects Linux kernel (CIFS/SMB client), Hosts mounting SMB/CIFS shares. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74608?
Apply vendor kernel security updates immediately; avoid untrusted SMB servers.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malicious SMB server can trigger a kernel use-after-free in the CIFS client, enabling kernel memory corruption with potential code execution, privilege escalation, or DoS.
Immediate action required
- affected>= cbc53148cc0946b72d62a3c53870cb22ce4ec284 and < 64d7584e62ac8cdc750455c5fdc6008fc2de4f06
- affected>= cff97d683a083b862a8bb24309e0f4d2d928128a and < c292d4686f717c03e5022fc4ae7c782f39a94915
- affected>= 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 and < 47dfac48bce7198ad4f1a388fc8c9491f878ac3b
- affected>= 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 and < 1ffacbadc14530e55b8d86f7b917524f6a0fb891
- affected>= 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 and < 1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
- affected>= 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 and < 4986410316b1ae0e63c6ce418e4eb196723626e7
- affected22a6c5b3425f327e7f4c3606a72277dce82c7d83
- affected>= 6.1.78 and < 6.1.183
- affected>= 6.6.17 and < 6.6.152
- affected>= 6.7.5 and < 6.8
- affected6.8
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.