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

CVE-2026-98493: net: ipconfig: bound DHCP option construction

—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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 24e79508b237dd2a69bc6fb6ac5cf7f126178307, 38a6a118260ebfc82d0c653194d616bdfbd236ac, abcba6f080c63e403037ecdffde43170d242376a; 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 24e79508b237dd2a69bc6fb6ac5cf7f126178307, 38a6a118260ebfc82d0c653194d616bdfbd236ac, abcba6f080c63e403037ecdffde43170d242376a; 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: net: ipconfig: bound DHCP option construction ic_dhcp_init_options() appends the hostname (option 12), vendor-class (option 60) and client-ID (option 61) options into the fixed 312-byte bootp_pkt.exten[] buffer. Only the client-ID branch checked the remaining space; the hostname and vendor-class writes were unbounded. A 64-byte hostname together with the maximum 252-byte dhcpclass= identifier needs 18 + (2 + 64) + (2 + 252) = 338 of the 312 available bytes even before the terminating END marker, so the vendor-class memcpy runs past the end of exten[]. With CONFIG_FORTIFY_SOURCE this is reported as a field-spanning write and, when the kernel is booted with panic_on_warn=1, aborts boot with a panic. Route the optional options through a common helper that makes sure the option, its 2-byte header and the END marker all fit and drops an option that would not. Configurations with short options keep sending exactly the same bytes as before.

Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 11th 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%

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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Follow CVE-2026-98493

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  • when exploit code appears or is weaponized
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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

    • 2.6.36affected
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before e0a221cec0e0ee437680ae0314a4b166509442c5affected · git
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before ca811550b9fa87e02845b4a332d194c2304d933faffected · git
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before d8016c82acdd7eaa462e1f38a962b15d8c6a650baffected · git
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before 38a6a118260ebfc82d0c653194d616bdfbd236acaffected · git
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before abcba6f080c63e403037ecdffde43170d242376aaffected · git
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before 24e79508b237dd2a69bc6fb6ac5cf7f126178307affected · git
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before cbaad2922bd5d4d303055ae9afecc8999e6b40c9affected · git
    • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 and later · before e47a1958e12abc3a17b5231a4f21c8f1bf662e08affected · git
    • before 2.6.36not 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 7.2.9-17.2.9-1

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-2026-98491Oct 18, 2026 · net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry
    31Monitor
  • ← EarlierCVE-2026-98492Oct 18, 2026 · net: macb: fix dma_alloc_coherent() leak on macb_alloc() error paths
    0Monitor
  • Later →CVE-2026-98494Oct 18, 2026 · net: atl1: fix soft lockup on out-of-range cmb_tpd_next_to_clean read
    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 Linux24e79508b237dd2a69bc6fb6ac5cf7f126178307Vendor (CNA)
Linux Linux38a6a118260ebfc82d0c653194d616bdfbd236acVendor (CNA)
Linux Linuxabcba6f080c63e403037ecdffde43170d242376aVendor (CNA)
Linux Linuxca811550b9fa87e02845b4a332d194c2304d933fVendor (CNA)
Linux Linuxcbaad2922bd5d4d303055ae9afecc8999e6b40c9Vendor (CNA)
Linux Linuxd8016c82acdd7eaa462e1f38a962b15d8c6a650bVendor (CNA)
Linux Linuxe0a221cec0e0ee437680ae0314a4b166509442c5Vendor (CNA)
Linux Linuxe47a1958e12abc3a17b5231a4f21c8f1bf662e08Vendor (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 13, 2026+26 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 (7 more)

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

All records