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

CVE-2026-98573: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()

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 3b4e0b0c008a8c1b474730248cd5b873026c74bd, 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b, 718747afa5463d9cc5fd9a09f03b2a492edd9b78; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3b4e0b0c008a8c1b474730248cd5b873026c74bd, 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b, 718747afa5463d9cc5fd9a09f03b2a492edd9b78; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() skb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max argument and passes the result to __pskb_pull_tail() as a signed int. The function does not ensure that max is at least skb_headlen(skb). This can happen while parsing IPv6 extension headers when an skb already has a linear area larger than MAX_IPV6_HDR_LEN. Once the parser needs data beyond the linear area, max - skb_headlen(skb) wraps and is converted to a negative delta. __pskb_pull_tail() then passes that negative length to skb_copy_bits(), where it can become a very large copy length. Pass the requested length itself as the pull bound at the three extension-header call sites, so the delta can no longer go negative.

—No exploit Fix available
Published
Oct 18, 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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  • A fix has been released

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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

    • 3.13affected
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before 9c4e432132a97b82edf28fa172c39f743e6bfb26affected · git
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before 718747afa5463d9cc5fd9a09f03b2a492edd9b78affected · git
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before a0ad0473c09d2e947aecac5c82e637ec85924b12affected · git
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before b2da5ed3d8c75e1b729a21b6d3beaed415e263f6affected · git
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14baffected · git
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962affected · git
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before d7f474226809471dc7877435e9c492cc914df0bfaffected · git
    • 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 and later · before 3b4e0b0c008a8c1b474730248cd5b873026c74bdaffected · git
    • before 3.13not 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 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

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-2026-98571Oct 18, 2026 · net: stmmac: clear stale buf->page after recycling on skb build failure
    0Monitor
  • ← EarlierCVE-2026-98572Oct 18, 2026 · bpf: Fix immediate JMP JEQ/JNE on MIPS32
    0Monitor
  • Later →CVE-2026-98574Oct 18, 2026 · net: bcmgenet: stop Tx NAPI before disabling the queues
    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 Linux3b4e0b0c008a8c1b474730248cd5b873026c74bdVendor (CNA)
Linux Linux6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14bVendor (CNA)
Linux Linux718747afa5463d9cc5fd9a09f03b2a492edd9b78Vendor (CNA)
Linux Linux9c4e432132a97b82edf28fa172c39f743e6bfb26Vendor (CNA)
Linux Linuxa0ad0473c09d2e947aecac5c82e637ec85924b12Vendor (CNA)
Linux Linuxb2da5ed3d8c75e1b729a21b6d3beaed415e263f6Vendor (CNA)
Linux Linuxcfa643f2ca36c6f913fe1a2ceb12412ebb0fd962Vendor (CNA)
Linux Linuxd7f474226809471dc7877435e9c492cc914df0bfVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package 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 5, 2026+18 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).

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. 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