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CVE-2026-89765· NVD / CVE Program· CNA Linux

timers/itimer: Zero-init old itimerval before copy to userspace

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 00ef529a5402f41eb1d227916437e237450719f9, 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8, 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 00ef529a5402f41eb1d227916437e237450719f9, 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8, 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e 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: timers/itimer: Zero-init old itimerval before copy to userspace On native sparc64, struct __kernel_old_timeval contains a four-byte hole after tv_usec because tv_sec is 64-bit while __kernel_suseconds_t is 32-bit. put_itimerval() fills only the named fields in a stack-allocated __kernel_old_itimerval and copies the entire object to userspace, so getitimer() can expose the two padding holes. Zero-initialize the aggregate before assigning the fields so implicit padding is deterministic before it crosses the user/kernel boundary.

—No exploit Fix available
Published
Sep 11, 2026
Updated
Sep 14, 2026
EPSS
0.2% · 9th 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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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6d4b937251386d9c6f968e7802f0cb16a8523772affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4ea70146ab9376092297eb8b622ef1792797f2cfaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a17b345daff46fec4af9f1ecbdf350208016dd15affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before bdfda99c5763822a9a888e8af0ad7d9312ffcfe2affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 00ef529a5402f41eb1d227916437e237450719f9affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8affected · git
    • before 2.6.12not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxall versions—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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    40Plan
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  • CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
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  • CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
    40Plan
  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan

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 Linux00ef529a5402f41eb1d227916437e237450719f9Vendor (CNA)
Linux Linux18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8Vendor (CNA)
Linux Linux2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25eVendor (CNA)
Linux Linux4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4Vendor (CNA)
Linux Linux4ea70146ab9376092297eb8b622ef1792797f2cfVendor (CNA)
Linux Linux6d4b937251386d9c6f968e7802f0cb16a8523772Vendor (CNA)
Linux Linuxa17b345daff46fec4af9f1ecbdf350208016dd15Vendor (CNA)
Linux Linuxbdfda99c5763822a9a888e8af0ad7d9312ffcfe2Vendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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.

No dated events beyond publication.

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. 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