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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-99070: ipv6: do not warn on route notification size race

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 24b2c95a046e15c9504a6d672b6b0b252952493f, 291fe0bafee78c95f9f2e7f579f17793fd5a1e5a, 4ac7d92a4698e34e614c254359665b9de1f65283; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 24b2c95a046e15c9504a6d672b6b0b252952493f, 291fe0bafee78c95f9f2e7f579f17793fd5a1e5a, 4ac7d92a4698e34e614c254359665b9de1f65283; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ipv6: do not warn on route notification size race fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later fills it with rt6_fill_node(). With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. rt6_fill_node() can then legitimately return -EMSGSIZE, so the warning does not prove a sizing bug. Remove the warning. The existing error path still frees the skb and reports the error to listeners.

Published
Oct 23, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.12affected
    • 907eea486888cfe118c19759bbc4b8fca2e004df and later · before dac2b0328495971c7b417fd0143e53643343936eaffected · git
    • 907eea486888cfe118c19759bbc4b8fca2e004df and later · before 24b2c95a046e15c9504a6d672b6b0b252952493faffected · git
    • 907eea486888cfe118c19759bbc4b8fca2e004df and later · before 8a3b935b6b6037eefb36bd27a60793a008358e8daffected · git
    • 907eea486888cfe118c19759bbc4b8fca2e004df and later · before 7b112bd43f1172fb152e848570a957467008a5aeaffected · git
    • 907eea486888cfe118c19759bbc4b8fca2e004df and later · before 4ac7d92a4698e34e614c254359665b9de1f65283affected · git
    • 907eea486888cfe118c19759bbc4b8fca2e004df and later · before 291fe0bafee78c95f9f2e7f579f17793fd5a1e5aaffected · git
    • 907eea486888cfe118c19759bbc4b8fca2e004df and later · before c97426ec649d99596d8969e1a052c16b14b7b485affected · git
    • before 5.12not affected · semver
    • 5.15.224 and later · up to and including 5.15.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.11-17.2.11-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99068Oct 23, 2026 · ALSA: ctxfi: Fix memory leakage when clearing DAO input mappers
    0Monitor
  • ← EarlierCVE-2026-99069Oct 23, 2026 · Input: ati_remote2 - fix type confusion in device attribute handlers
    0Monitor
  • Later →CVE-2026-99071Oct 23, 2026 · ipv4: do not warn on route notification size race
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux24b2c95a046e15c9504a6d672b6b0b252952493fVendor (CNA)
Linux Linux291fe0bafee78c95f9f2e7f579f17793fd5a1e5aVendor (CNA)
Linux Linux4ac7d92a4698e34e614c254359665b9de1f65283Vendor (CNA)
Linux Linux7b112bd43f1172fb152e848570a957467008a5aeVendor (CNA)
Linux Linux8a3b935b6b6037eefb36bd27a60793a008358e8dVendor (CNA)
Linux Linuxc97426ec649d99596d8969e1a052c16b14b7b485Vendor (CNA)
Linux Linuxdac2b0328495971c7b417fd0143e53643343936eVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.06.6.161.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+21 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records