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

CVE-2026-98631: xsk: Use a 32-bit compare in xsk_map_gen_lookup

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 11d9be35c1f4233798e99be98bc474f83a254c6c, 123f90f394ca404ab8796a7c8072ff7fa5b65a9c, 227ec890559e922e235eb543646e3bf0bd8269b0; 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 11d9be35c1f4233798e99be98bc474f83a254c6c, 123f90f394ca404ab8796a7c8072ff7fa5b65a9c, 227ec890559e922e235eb543646e3bf0bd8269b0; 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: xsk: Use a 32-bit compare in xsk_map_gen_lookup xsk_map_gen_lookup() loads a u32 key and compares it with max_entries using BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a max_entries value of 0x80000000 or higher becomes a threshold larger than every zero-extended 32-bit key. An out-of-range index then skips the bounds check and the generated lookup reads past xsk_map[]. Compare with BPF_JMP32_IMM so the check stays in 32-bit unsigned range.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 19, 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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When you'll hear from us

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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

    • 5.5affected
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before c6d5c582d55a8f229d75e98d62eaa065b0deb18daffected · git
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before 227ec890559e922e235eb543646e3bf0bd8269b0affected · git
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before 11d9be35c1f4233798e99be98bc474f83a254c6caffected · git
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before 123f90f394ca404ab8796a7c8072ff7fa5b65a9caffected · git
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before 36461e58f88a1b723f86693f437ac12e60ff4363affected · git
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before b5c0cff0c5331582ab01c4c423731453a8381accaffected · git
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before 3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24affected · git
    • e65650f291ee72fc578d6346080fc4699204ef2c and later · before 70504de0bb627848667207bec7ccfd647deb8814affected · git
    • before 5.5not 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-2026-98629Oct 18, 2026 · net/sched: cls_u32: fix manual hash table handle IDR aliasing
    0Monitor
  • ← EarlierCVE-2026-98630Oct 18, 2026 · eth: fbnic: Fix payload page pool error cleanup
    0Monitor
  • Later →CVE-2026-98632Oct 18, 2026 · Bluetooth: mgmt: Dequeue pending mesh_send_sync entries on cancel
    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 Linux11d9be35c1f4233798e99be98bc474f83a254c6cVendor (CNA)
Linux Linux123f90f394ca404ab8796a7c8072ff7fa5b65a9cVendor (CNA)
Linux Linux227ec890559e922e235eb543646e3bf0bd8269b0Vendor (CNA)
Linux Linux36461e58f88a1b723f86693f437ac12e60ff4363Vendor (CNA)
Linux Linux3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24Vendor (CNA)
Linux Linux70504de0bb627848667207bec7ccfd647deb8814Vendor (CNA)
Linux Linuxb5c0cff0c5331582ab01c4c423731453a8381accVendor (CNA)
Linux Linuxc6d5c582d55a8f229d75e98d62eaa065b0deb18dVendor (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 10, 2026+23 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