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NVD / CVE Program· CNA Linux

CVE-2026-98077: netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()

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 0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79, 4a30aa2ba007db18210dd52219ecbd5528c03523, 4be8380e3af008f418f97992c06f23be649a430d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79, 4a30aa2ba007db18210dd52219ecbd5528c03523, 4be8380e3af008f418f97992c06f23be649a430d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace() sip_skip_whitespace() returns dptr unchanged when its own loop exhausts the buffer (dptr == limit), instead of NULL like its sibling sip_follow_continuation() returns on its own "no more data" path. ct_sip_get_header() only checks for NULL after calling it: dptr = sip_skip_whitespace(dptr, limit); if (dptr == NULL) break; if (*dptr != ':' || ++dptr >= limit) break; so a recognized header name followed only by spaces/tabs running to the exact end of the SIP payload, with no colon, makes the very next statement read one byte past the buffer. Make both "no more data" outcomes return NULL, matching the convention sip_follow_continuation() already uses and that both existing callers already check for.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 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?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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

    • 2.6.26affected
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before 9ae0a87e6f513293677fe286729fbae34d592215affected · git
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before b6277622b7323000895b674321c9a1f060553188affected · git
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before 0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79affected · git
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before c6beb08b1a9fdb96795816d8329ed75dd785d48eaffected · git
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before 60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94affected · git
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before 4be8380e3af008f418f97992c06f23be649a430daffected · git
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before 4a30aa2ba007db18210dd52219ecbd5528c03523affected · git
    • ea45f12a2766dae54e5426a23e8f4bafdbe2782e and later · before e8f8231824b5815f57ce62cba116e511b10196deaffected · git
    • before 2.6.26not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

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-2026-98075Sep 25, 2026 · bpf: reject BPF_PSEUDO_FUNC reference to the main program
    0Monitor
  • ← EarlierCVE-2026-98076Sep 25, 2026 · tracing/probes: Fix use-after-free on field name/type of events with multiple probes
    0Monitor
  • Later →CVE-2026-98079Sep 25, 2026 · btrfs: zstd: fix lost wakeup when waiting for a workspace
    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 Linux0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79Vendor (CNA)
Linux Linux4a30aa2ba007db18210dd52219ecbd5528c03523Vendor (CNA)
Linux Linux4be8380e3af008f418f97992c06f23be649a430dVendor (CNA)
Linux Linux60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94Vendor (CNA)
Linux Linux9ae0a87e6f513293677fe286729fbae34d592215Vendor (CNA)
Linux Linuxb6277622b7323000895b674321c9a1f060553188Vendor (CNA)
Linux Linuxc6beb08b1a9fdb96795816d8329ed75dd785d48eVendor (CNA)
Linux Linuxe8f8231824b5815f57ce62cba116e511b10196deVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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.

No dated events beyond publication.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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. 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.

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