Vulnary
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Critical· 9.4official fix available

CVE-2026-63830

A critical Linux kernel vulnerability (CVE-2026-63830) allows BPF programs to modify protected page cache data due to improper synchronization of scatterlist entry ownership flags during data transformations.

publishedJul 19, 2026
last modifiedJul 27, 2026
sourcesNVD
severity · cvss
9.4
critical · how bad it is
exploitation · epss
<1%
28th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 19, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux kernel users (specific affected products not listed)

02

Real-world impact

High risk of data corruption or unauthorized modification via BPF stores

03

Why this severity

CVSS 9.4 (critical) - Network-based attack with low complexity

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade the Linux kernel to a version that includes the fix for sk_msg sg.copy synchronization

NVD description of kernel vulnerability resolution

05

Timeline

  1. Jul 19, 2026 · 14d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 20, 2026 · 13d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
  3. Jul 27, 2026 · 6d ago
    Advisory updated
    The NVD record was last revised.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactLow
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →