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TI-2026-04600 Aliases CVE-2026-5265GHSA-whr7-6788-jg2p

Ovn: ovn: heap over-read in icmp error response generation

Priority LOW 30CWE-130Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · None · High
Fix status
Partial Red Hat: 3 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00629 50th percentileScored 2026-11-07
Fix Partial Red Hat: 9 advisoriesRed Hat: 3 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatFast Datapath for Red Hat Enterprise Linux 10—25.03.2-100.el10fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 10—25.09.2-103.el10fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 8—21.12.0-145.el8fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 8—23.06.4-30.el8fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 9—23.06.4-30.el9fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 9—23.09.6-16.el9fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 9—24.03.7-82.el9fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 9—25.03.2-100.el9fdpPatch availableCNA
Red HatFast Datapath for Red Hat Enterprise Linux 9—25.09.2-103.el9fdpPatch availableCNA
Red HatFast Datapath for RHEL 7——No fix listedCNA
Red HatFast Datapath for RHEL 7——No fix listedCNA
Red HatFast Datapath for RHEL 7——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 8——No fix listedCNA
Red HatFast Datapath for RHEL 9——No fix listedCNA
Red HatFast Datapath for RHEL 9——No fix listedCNA
Red HatFast Datapath for RHEL 9——No fix listedCNA
Red HatFast Datapath for RHEL 9——No fix listedCNA
Red HatFast Datapath for RHEL 9——No fix listedCNA
Red HatFast Datapath for RHEL 9——No fix listedCNA
Red HatFast Datapath for RHEL 9——No fix listedCNA
  • Fast Datapath for Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 25.03.2-100.el10fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 25.09.2-103.el10fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 21.12.0-145.el8fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 23.06.4-30.el8fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 23.06.4-30.el9fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 23.09.6-16.el9fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 24.03.7-82.el9fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 25.03.2-100.el9fdp Patch available CNA
  • Fast Datapath for Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 25.09.2-103.el9fdp Patch available CNA
  • Fast Datapath for RHEL 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Fast Datapath for RHEL 9 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 4

CPEVersionsRoleVendor
cpe:/o:redhat:enterprise_linux:10::fastdatapath10—Red Hat
cpe:/o:redhat:enterprise_linux:8::fastdatapath8—Red Hat
cpe:/o:redhat:enterprise_linux:9::fastdatapath9—Red Hat
cpe:/o:redhat:enterprise_linux:7::fastdatapath7—Red Hat
  • cpe:/o:redhat:enterprise_linux:10::fastdatapath Versions 10 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:8::fastdatapath Versions 8 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:9::fastdatapath Versions 9 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:7::fastdatapath Versions 7 — ·Red Hat

Remediation

Red Hat 9 advisories

  • RHSA-2026:22110 Released 2026-06-01 · Red Hat rating Important
    ovn25.03 security update
    • Fast Datapath for Red Hat Enterprise Linux 10 ovn25.03-25.03.2-100.el10fdp, ovn25.03-central-25.03.2-100.el10fdp, ovn25.03-host-25.03.2-100.el10fdp +1
  • RHSA-2026:22111 Released 2026-06-01 · Red Hat rating Important
    ovn25.09 security update
    • Fast Datapath for Red Hat Enterprise Linux 10 ovn25.09-25.09.2-103.el10fdp, ovn25.09-central-25.09.2-103.el10fdp, ovn25.09-host-25.09.2-103.el10fdp +1
  • RHSA-2026:11700 Released 2026-04-29 · Red Hat rating Important
    ovn24.03 security update
    • Fast Datapath for Red Hat Enterprise Linux 9 ovn24.03-24.03.7-82.el9fdp, ovn24.03-central-24.03.7-82.el9fdp, ovn24.03-host-24.03.7-82.el9fdp +1
Show 6 more Red Hat advisories
  • RHSA-2026:11702 Released 2026-04-29 · Red Hat rating Important
    ovn25.09 security update
    • Fast Datapath for Red Hat Enterprise Linux 9 ovn25.09-25.09.2-103.el9fdp, ovn25.09-central-25.09.2-103.el9fdp, ovn25.09-host-25.09.2-103.el9fdp +1
  • RHSA-2026:11701 Released 2026-04-29 · Red Hat rating Important
    ovn25.03 security update
    • Fast Datapath for Red Hat Enterprise Linux 9 ovn25.03-25.03.2-100.el9fdp, ovn25.03-central-25.03.2-100.el9fdp, ovn25.03-host-25.03.2-100.el9fdp +1
  • RHSA-2026:11698 Released 2026-04-29 · Red Hat rating Important
    ovn23.09 security update
    • Fast Datapath for Red Hat Enterprise Linux 9 ovn23.09-23.09.6-16.el9fdp, ovn23.09-central-23.09.6-16.el9fdp, ovn23.09-host-23.09.6-16.el9fdp +1
  • RHSA-2026:11696 Released 2026-04-29 · Red Hat rating Important
    ovn23.06 security update
    • Fast Datapath for Red Hat Enterprise Linux 9 ovn23.06-23.06.4-30.el9fdp, ovn23.06-central-23.06.4-30.el9fdp, ovn23.06-host-23.06.4-30.el9fdp +1
  • RHSA-2026:11695 Released 2026-04-29 · Red Hat rating Important
    ovn23.06 security update
    • Fast Datapath for Red Hat Enterprise Linux 8 ovn23.06-23.06.4-30.el8fdp, ovn23.06-central-23.06.4-30.el8fdp, ovn23.06-host-23.06.4-30.el8fdp +1
  • RHSA-2026:11694 Released 2026-04-29 · Red Hat rating Important
    ovn-2021 security update
    • Fast Datapath for Red Hat Enterprise Linux 8 ovn-2021-21.12.0-145.el8fdp, ovn-2021-central-21.12.0-145.el8fdp, ovn-2021-host-21.12.0-145.el8fdp +1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:11694

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:11695

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
Show 7 more groups
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:11696

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:11698

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:11700

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:11701

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:11702

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:22110

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Fast Datapath for RHEL 8, Fast Datapath for RHEL 9 and 3 more products — RHSA-2026:22111

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-04696 Ovn: ovn: information disclosure via crafted dhcpv6 packetsPriority MEDIUM 45
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Fast Datapath for RHEL 7AffectedNo fix yet: Fix deferred
Fast Datapath for RHEL 8AffectedNo fix yet: Fix deferred
Fast Datapath for RHEL 9AffectedNo fix yet
Fast Datapath for Red Hat Enterprise Linux 10Fixed RHSA-2026:22110, RHSA-2026:22111
Fast Datapath for Red Hat Enterprise Linux 8Fixed RHSA-2026:11694, RHSA-2026:11695
Fast Datapath for Red Hat Enterprise Linux 9Fixed RHSA-2026:11696, RHSA-2026:11698, RHSA-2026:11700, RHSA-2026:11701, RHSA-2026:11702

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5265
  2. 2026-10-03 Alias added: GHSA-whr7-6788-jg2p
  3. 2026-10-08 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile
  5. 2026-10-28 EPSS moved to the 50th–90th percentile

References

Advisory 9

Other 2

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences