Affects core Linux kernel; widely deployed and critical infrastructure; potential memory disclosure via crafted IPv6 ND options.
CVE-2026-31682
Linux kernel ND option parsing may read non-linear data.
Is CVE-2026-31682 being exploited?
Not confirmed. CVE-2026-31682 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-2026-31682?
CVE-2026-31682 is rated Critical with a CVSS score of 9.1. 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-2026-31682?
Yes. A fix has been recorded for CVE-2026-31682. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-31682 affect?
CVE-2026-31682 affects Linux kernel. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-31682?
Update to patched kernel version and reboot
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote memory disclosure and potential DoS via crafted IPv6 ND messages triggering br_nd_send parsing.
Patch when possible
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < c68433fd291c9e88c00292095172c62d1997d662
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < 4f397b950c916e9a1f8a4fce04ea0110206cad47
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < bd91ec85aa4c77d645bd2739fc56784157a88ca2
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < 658261898130da620fc3d0fbb0523efb3366cb55
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < 2ba4caba423ed94d63006eb1d2227b0332ab7fcd
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < 9c55e41c73af5c4511070933b1bd25248521270c
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < 3a30f6469b058574f49efde61cd6f5d79e576053
- affected>= ed842faeb2bd49256f00485402f3113205f91d30 and < a01aee7cafc575bb82f5529e8734e7052f9b16ea
- affected4.15
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.