High-severity kernel flaw in ksmbd with potential remote memory corruption; affects Linux widely.
CVE-2026-31705
Linux ksmbd OOB write in smb2_get_ea() can corrupt kernel memory.
Is CVE-2026-31705 being exploited?
Not confirmed. CVE-2026-31705 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 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-31705?
CVE-2026-31705 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-2026-31705?
Yes. A fix has been recorded for CVE-2026-31705. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-31705 affect?
CVE-2026-31705 affects Linux kernel with ksmbd (SMB server). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-31705?
Apply kernel update promptly; reboot to apply
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote kernel memory corruption via OOB write in ksmbd SMB2 EA handling; could allow privilege escalation or system crash.
Patch when possible
- affected>= 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 and < ddbbc8b2a09dd2cfed90871313e3691ae1db08a2
- affected>= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and < ffbce350c6fd1e99116ea57383b9031717e36d3b
- affected>= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and < 98f3de6ef4efbd899348d333f0902dc4ff14380c
- affected>= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and < 790304c02bf9bd7b8171feda4294d6e62d32ae8f
- affected>= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and < 922d48fe8c19f388ffa2f709f33acaae4e408de2
- affected>= e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and < 30010c952077a1c89ecdd71fc4d574c75a8f5617
- affectedf2283680a80571ca82d710bc6ecd8f8beac67d63
- affected>= 6.1.71 and < 6.1.175
- affected>= 5.15.145 and < 5.16
- affected6.6
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.