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

CVE-2026-98856: kprobes: Skip disarmed probes when checking optkprobe overlap

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 3b0f604df9e2b9a456f1ae5266a439998c4c8826, 3f968dcdf018861129f97910fa7bd680d939a9b0, 526fac219e8b7d3369b43026bd0a1df51b811cd4; 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 3b0f604df9e2b9a456f1ae5266a439998c4c8826, 3f968dcdf018861129f97910fa7bd680d939a9b0, 526fac219e8b7d3369b43026bd0a1df51b811cd4; 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: kprobes: Skip disarmed probes when checking optkprobe overlap On x86, an optkprobe at A replaces five bytes with a jump. If a disabled probe B is at A+2, get_optimized_kprobe() stops at B when arming a new probe C at A+4. It leaves A optimized: A A+1 A+2 A+3 A+4 A's jump | e9 | d0 | d1 | d2 | d3 | after C | e9 | d0 | d1 | d2 | cc | The INT3 for C overwrites the last byte of A's jump displacement, so execution can jump to the wrong address. B can have prepared optinsns while disarmed, but has no jump to unoptimize. Continue past disarmed and unprepared probes to find the active optimized probe before arming a probe in its jump.

—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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  • 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

    • 2.6.34affected
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before e29e819cacfb4e3cd56d41eb704ab4718d6d2915affected · git
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before ab9ed9faa67bf67383ff7e1479655e232a843c2baffected · git
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before 3b0f604df9e2b9a456f1ae5266a439998c4c8826affected · git
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before 3f968dcdf018861129f97910fa7bd680d939a9b0affected · git
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before 985a568171e7bdba6dcde3420d0e5bb515813457affected · git
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before 6745fa65f4115045431c0c15610e876855a04625affected · git
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before 526fac219e8b7d3369b43026bd0a1df51b811cd4affected · git
    • afd66255b9a48f5851326ddae50e2203fbf71dc9 and later · before 7a39c732a22ec4a369af9e19fbe3d666ec83eec4affected · git
    • before 2.6.34not 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-2026-98854Oct 18, 2026 · of/overlay: only treat a positive changeset id as registered
    0Monitor
  • ← EarlierCVE-2026-98855Oct 18, 2026 · of/overlay: put property on deadprops only after changeset add succeeds
    0Monitor
  • Later →CVE-2026-98857Oct 18, 2026 · ipvs: bound LBLCR and LBLC cache growth
    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 Linux3b0f604df9e2b9a456f1ae5266a439998c4c8826Vendor (CNA)
Linux Linux3f968dcdf018861129f97910fa7bd680d939a9b0Vendor (CNA)
Linux Linux526fac219e8b7d3369b43026bd0a1df51b811cd4Vendor (CNA)
Linux Linux6745fa65f4115045431c0c15610e876855a04625Vendor (CNA)
Linux Linux7a39c732a22ec4a369af9e19fbe3d666ec83eec4Vendor (CNA)
Linux Linux985a568171e7bdba6dcde3420d0e5bb515813457Vendor (CNA)
Linux Linuxab9ed9faa67bf67383ff7e1479655e232a843c2bVendor (CNA)
Linux Linuxe29e819cacfb4e3cd56d41eb704ab4718d6d2915Vendor (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 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).

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