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

CVE-2026-98655: perf: Require kernel access for text poke events

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: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 0e26d44b7c64b045adebcf5d614140f811f09752, 357e8a77a501d96c9517f01f4a211eed5e9c9184, 4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3; 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 0e26d44b7c64b045adebcf5d614140f811f09752, 357e8a77a501d96c9517f01f4a211eed5e9c9184, 4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3; 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: perf: Require kernel access for text poke events Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address. An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR. Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 8th 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 · 0.1%

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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

    • 5.9affected
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before 4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3affected · git
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before c30886396eb1c0e9fdc4296398dea0db0ab37610affected · git
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before 0e26d44b7c64b045adebcf5d614140f811f09752affected · git
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before 8c38cb055f6a9651198780e4e4d5283de4039f79affected · git
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before 8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7affected · git
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before e506333d1b9f42f1e402acebf1283af3c44a3809affected · git
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before 677d0b51ac1a0db55d768c4c6399210b3de0795baffected · git
    • e17d43b93e544f5016c0251d2074c15568d5d963 and later · before 357e8a77a501d96c9517f01f4a211eed5e9c9184affected · git
    • before 5.9not 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-2026-98652Oct 18, 2026 · KVM: s390: Add missing srcu in kvm_s390_set_irq_state()
    0Monitor
  • ← EarlierCVE-2026-98653Oct 18, 2026 · KVM: s390: Fix _gaccess_shadow_fault()
    0Monitor
  • Later →CVE-2026-98656Oct 18, 2026 · iio: trigger: cancel reenable_work before freeing trigger
    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 Linux0e26d44b7c64b045adebcf5d614140f811f09752Vendor (CNA)
Linux Linux357e8a77a501d96c9517f01f4a211eed5e9c9184Vendor (CNA)
Linux Linux4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3Vendor (CNA)
Linux Linux677d0b51ac1a0db55d768c4c6399210b3de0795bVendor (CNA)
Linux Linux8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7Vendor (CNA)
Linux Linux8c38cb055f6a9651198780e4e4d5283de4039f79Vendor (CNA)
Linux Linuxc30886396eb1c0e9fdc4296398dea0db0ab37610Vendor (CNA)
Linux Linuxe506333d1b9f42f1e402acebf1283af3c44a3809Vendor (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 7, 2026+20 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