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

CVE-2026-98794: ipvs: filter some flags received in the backup server

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 3a9f5459db60311643bfbadf019f6d5370f2f26a, 438a5335276614186d6a96b8e7bddce811ad4ad6, 45a93111835ccfea7d969ec73588e33745fd9834; 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.

Low priority for now. Upgrade to Linux Linux 3a9f5459db60311643bfbadf019f6d5370f2f26a, 438a5335276614186d6a96b8e7bddce811ad4ad6, 45a93111835ccfea7d969ec73588e33745fd9834; 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: ipvs: filter some flags received in the backup server While the IPVS SYNC protocol is not secure by design we can still protect the backup server from messages that can wreak havoc. This commit addresses problems from received connection flags or their combinations. We now drop messages as follows: 1. the NO_CPORT+TEMPLATE combination allows lookups for normal connections to hit template which can break in many ways. While the master does not sync connections with NO_CPORT flag, i.e. before they are established, we still accept NO_CPORT without TEMPLATE. 2. ONE_PACKET: it is not sent by master, so we do not expect it in backup. Before now it was ignored by IP_VS_CONN_F_BACKUP_MASK for protocol v1 while protocol v0 created connections that are not hashed and dropped immediately. Better to apply the IP_VS_CONN_F_BACKUP_MASK also to the flags from v0 messages for consistency with v1.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 12th 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 · 0.2%

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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

    • 2.6.14affected
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before ef3cd6c0b826e50dc21653b32552e258de6fd51caffected · git
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before 3a9f5459db60311643bfbadf019f6d5370f2f26aaffected · git
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before 438a5335276614186d6a96b8e7bddce811ad4ad6affected · git
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before d7d33c9efa9d1a2f244a1a64ec9b540b0f8975a0affected · git
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before f4cd1db7d421e82945713a36084bb0c35b75b27eaffected · git
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before 55d033324f67a15ff56be6d38d6e87f644e0ed62affected · git
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before 45a93111835ccfea7d969ec73588e33745fd9834affected · git
    • 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 and later · before f96e91748f6304668fe647e686d199d7207d36f1affected · git
    • before 2.6.14not 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:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.10-17.2.10-1

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-2026-98792Oct 18, 2026 · netfilter: flowtable: generalize pending status bit
    0Monitor
  • ← EarlierCVE-2026-98793Oct 18, 2026 · netfilter: bpf: reject invalid NAT manipulation types
    0Monitor
  • Later →CVE-2026-98795Oct 18, 2026 · net: sparx5: skip ptp deinit if init was skipped
    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 Linux3a9f5459db60311643bfbadf019f6d5370f2f26aVendor (CNA)
Linux Linux438a5335276614186d6a96b8e7bddce811ad4ad6Vendor (CNA)
Linux Linux45a93111835ccfea7d969ec73588e33745fd9834Vendor (CNA)
Linux Linux55d033324f67a15ff56be6d38d6e87f644e0ed62Vendor (CNA)
Linux Linuxd7d33c9efa9d1a2f244a1a64ec9b540b0f8975a0Vendor (CNA)
Linux Linuxef3cd6c0b826e50dc21653b32552e258de6fd51cVendor (CNA)
Linux Linuxf4cd1db7d421e82945713a36084bb0c35b75b27eVendor (CNA)
Linux Linuxf96e91748f6304668fe647e686d199d7207d36f1Vendor (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)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package 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 7, 2026+20 d
EPSS, last 120 days

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

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records