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

CVE-2026-99245: KEYS: Fix key_reject_and_link() race with keyring restriction

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: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 01835d3a3709be508ae5209f806640336c48e395, 0b157166e612b70f98a332b6c7be7eac6f8e9593, 19dfc37c9deefa69dc805d01d35d1f2fd7902e33.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 01835d3a3709be508ae5209f806640336c48e395, 0b157166e612b70f98a332b6c7be7eac6f8e9593, 19dfc37c9deefa69dc805d01d35d1f2fd7902e33 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: KEYS: Fix key_reject_and_link() race with keyring restriction The restrict_link check in key_reject_and_link() is done before taking the keyring semaphore, racing with a concurrent keyring_restrict() that installs the restriction while holding the semaphore in write mode. Move the check to after __key_link_lock(), so it is done under the semaphore, matching the pattern used in __key_create_or_update().

—No exploit Fix available
Published
Nov 3, 2026
Updated
Nov 3, 2026
EPSS
0.2% · 13th 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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  • 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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Noroxi analysis

What does it mean in your environment?

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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

    • 4.7affected
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before c7956ec99ad0e173720d95de9fa788bb077809f2affected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 2c3d907dd15f4e30d4c35b9f7a7a5078de6a1b1faffected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 72f367417a6aee56821d0b0114cfd2b080008b63affected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 19dfc37c9deefa69dc805d01d35d1f2fd7902e33affected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 5787887eba0f0979a8c86d03a8e891395d5c24adaffected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 01835d3a3709be508ae5209f806640336c48e395affected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 6fc0c818b1cac66003e937c8a0d3bfb23fd3f130affected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 23a9163cc40b4996ba1e20533b1210a1a0bee416affected · git
    • 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c and later · before 0b157166e612b70f98a332b6c7be7eac6f8e9593affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.115-16.12.115-1

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-2026-99242Nov 2, 2026 · ntfs: fix race between fallocate and mmap reads
    0Monitor
  • ← EarlierCVE-2026-99244Nov 3, 2026 · pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper
    0Monitor
  • Later →CVE-2026-99246Nov 3, 2026 · tipc: protect node reset trace dump with node lock
    32Monitor

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 Linux01835d3a3709be508ae5209f806640336c48e395Vendor (CNA)
Linux Linux0b157166e612b70f98a332b6c7be7eac6f8e9593Vendor (CNA)
Linux Linux19dfc37c9deefa69dc805d01d35d1f2fd7902e33Vendor (CNA)
Linux Linux23a9163cc40b4996ba1e20533b1210a1a0bee416Vendor (CNA)
Linux Linux2c3d907dd15f4e30d4c35b9f7a7a5078de6a1b1fVendor (CNA)
Linux Linux5787887eba0f0979a8c86d03a8e891395d5c24adVendor (CNA)
Linux Linux6fc0c818b1cac66003e937c8a0d3bfb23fd3f130Vendor (CNA)
Linux Linux72f367417a6aee56821d0b0114cfd2b080008b63Vendor (CNA)
Linux Linuxc7956ec99ad0e173720d95de9fa788bb077809f2Vendor (CNA)
debian:linux6.12.115-1 · Debian:13Package 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 5, 2026+2 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 (8 more)

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

All records