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

CVE-2026-99244: pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper

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 2c20ace1698d03a23467351be1d281e89b36ade3, 30b274508c743f243c82904954c4e416d7143d4c, 3d15ac36ce174477efa5365e424dbd47950fd2b9.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2c20ace1698d03a23467351be1d281e89b36ade3, 30b274508c743f243c82904954c4e416d7143d4c, 3d15ac36ce174477efa5365e424dbd47950fd2b9 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: pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper Since commit 7fea700e04bd ("zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING") zap_pid_ns_processes() clears TIF_NOTIFY_SIGNAL before every kernel_wait4() call. Otherwise kernel_wait4() doesn't sleep and returns -ERESTARTSYS if signal_pending() is true and the reaper busy-waits. But clearing TIF_NOTIFY_SIGNAL doesn't fix it. It can get raised again. For example, klp_send_signals() sets it raw against any task that hasn't transitioned yet. And it keeps sending it until the livepatch finishes. The sleep loop waiting for pid_allocated to drop has the same problem and it doesn't even clear anything. So a schedule() in TASK_INTERRUPTIBLE returns immediately. Use a no_notify_signal guard. signal_pending() will ignore TIF_NOTIFY_SIGNAL and the pid namespace reaper sleeps until a child exits or free_pid() wakes it.

—No exploit Fix available
Published
Nov 3, 2026
Updated
Nov 3, 2026
EPSS
0.1% · 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 · 0.1%

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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

    • 82c7acf9a12c9b4e4b0aba531de82b4e39a345c8, 8e69e589f233ca2c9631f5af2b94f95dfc2ba804, 09ab5b424b17cfe633db58bb2f9edbaf9484cf20, 6.10affected
    • edd2754a62bee8d97b4808a15de024f66a1ddccf and later · before 2c20ace1698d03a23467351be1d281e89b36ade3affected · git
    • 3466abafa9f4f81a869da828e52a12f693175ec2 and later · before 9ab0324f4868eeb20c63f063a1e5bc01d5539212affected · git
    • 7fea700e04bd3f424c2d836e98425782f97b494e and later · before 30b274508c743f243c82904954c4e416d7143d4caffected · git
    • 7fea700e04bd3f424c2d836e98425782f97b494e and later · before 70178691c467c8f9f722765299fd8524c3121a35affected · git
    • 7fea700e04bd3f424c2d836e98425782f97b494e and later · before 3d15ac36ce174477efa5365e424dbd47950fd2b9affected · git
    • 7fea700e04bd3f424c2d836e98425782f97b494e and later · before f46cd8241d9b83f2279cc0db3e9d3e181b548a59affected · git
    • 7fea700e04bd3f424c2d836e98425782f97b494e and later · before 5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2affected · git
    • 6.1.95 and later · before 6.1.191affected · semver
    • 6.6.35 and later · before 6.6.161affected · semver

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-2026-99241Nov 2, 2026 · ntfs: take invalidate_lock in ntfs_filemap_page_mkwrite()
    0Monitor
  • ← EarlierCVE-2026-99242Nov 2, 2026 · ntfs: fix race between fallocate and mmap reads
    0Monitor
  • Later →CVE-2026-99245Nov 3, 2026 · KEYS: Fix key_reject_and_link() race with keyring restriction
    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 Linux2c20ace1698d03a23467351be1d281e89b36ade3Vendor (CNA)
Linux Linux30b274508c743f243c82904954c4e416d7143d4cVendor (CNA)
Linux Linux3d15ac36ce174477efa5365e424dbd47950fd2b9Vendor (CNA)
Linux Linux5.11Vendor (CNA)
Linux Linux5.16Vendor (CNA)
Linux Linux5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2Vendor (CNA)
Linux Linux6.1.191Vendor (CNA)
Linux Linux6.10Vendor (CNA)
Linux Linux6.6.161Vendor (CNA)
Linux Linux70178691c467c8f9f722765299fd8524c3121a35Vendor (CNA)
Linux Linux9ab0324f4868eeb20c63f063a1e5bc01d5539212Vendor (CNA)
Linux Linuxf46cd8241d9b83f2279cc0db3e9d3e181b548a59Vendor (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 7, 2026+4 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 (6 more)

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

All records