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CVE-2026-98388

exec: do_close_on_exec() before taking exec_update_lock

CVSS score

2.5

EPSS probability

%0.2

Risk score

0.0

Published

4 d ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Official patch verified

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

Linux kernel exec_update_lock deadlock vulnerability

Sources read

3

Source agreement

Tam uyum

Evidence confidence

%71

Short explanation

A vulnerability exists in the Linux kernel where do_close_on_exec() is called while holding the exec_update_lock, which can cause deadlocks while waiting for filesystem responses.

Why does it matter?

This flaw can cause hung filesystems or FUSE filesystems to deadlock when inspecting process state, leading to localized denial of service conditions.

What should be done?

  • Follow vendor advisory guidance
  • Update affected Linux kernel versions
Chain of evidence and sources2 verified claims

do_close_on_exec() fonksiyonu exec_update_lock kilidi tutulurken çağrılmaktadır.

S0 · daybreach-canonicalS1 · cvelistS2 · nvd

Bu durum askıda kalan dosya sistemleri veya FUSE dosya sistemleri ile kilitlenmelere yol açabilir.

S0 · daybreach-canonicalS1 · cvelistS2 · nvd
Show the technical text from the sources

In the Linux kernel, the following vulnerability has been resolved: exec: do_close_on_exec() before taking exec_update_lock do_close_on_exec() currently happens while holding the exec_update_lock, which is used in a lot of places that access process state to synchronize access checks. I recently added another such use of exec_update_lock, causing a regression. do_close_on_exec() can block waiting for a reply from a filesystem. That means a hung filesystem can block codepaths that use exec_update_lock; and it also means that a FUSE filesystem which attempts to inspect the calling process can deadlock. To avoid such problems, move do_close_on_exec() before the exec_update_lock is taken, but after the FD table has been copied if necessary. I have looked through all the calls between the old and new position of the do_close_on_exec() call; there seems to be no file descriptor table access in between.

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-98388 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1linuxLinux View
2linuxLinux View
Total affected vendors: 1|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
2.5CVSS 3.x—CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:LMicrosoft MSRC

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

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reference

Yama veya çözüm referansı

Open source
Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98388 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98388 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsLow
UserGerekmiyor

Official Sources and Advisories

https://git.kernel.org/stable/c/955973fff4a36d39a848b00cac1706863f568fe1vendor-advisoryhttps://git.kernel.org/stable/c/550feab5b01000ab314868b62211fb3ddfd600e8vendor-advisoryhttps://git.kernel.org/stable/c/5aacc19ba2b1faf84c4a2f2cf9a1784e03d1ff38vendor-advisoryhttps://git.kernel.org/stable/c/3feb4020bfb7ccf0d347f27051639d25e19cd65dvendor-advisoryhttps://git.kernel.org/stable/c/0d86cd6b709c39216e6ee5ea8f0fc4242bbb2b53vendor-advisoryhttps://git.kernel.org/stable/c/19ddef61ee0a49782a60f8f497e50597ad5de2davendor-advisoryhttps://git.kernel.org/stable/c/63be3d8511bdafa095cd14a393cbf3c58dbbb928vendor-advisoryhttps://git.kernel.org/stable/c/e780259b54e618ceb4763fbc21314acf3565e813vendor-advisoryhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgradepatch

CVSS Vector Radar Chart

2.5 / 10
Attack VectorLocalComplexityHighPrivilegesLowUser Interact.NoneConfidentialityHighIntegrityNoneAvailabilityLow

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredLow privileges
User InteractionNone required
Confidentiality (Gizlilik)High
Integrity (Bütünlük)None
Availability (Erişilebilirlik)Low

Yama doğrulandı

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