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Review reviewHigh

CVE-2026-64002

Linux

In the Linux kernel, the following vulnerability has been resolved: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() ipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports too soon. Only after unregister_net_sysctl_table() we can be sure no threads can possibly use the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports.

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() ipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports too soon. Only after unregister_net_sysctl_table() we can be sure no threads can possibly use the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports.

Affected product and versions

Product
Linux
Affected versions
>= 122ff243f5f104194750ecbc76d5946dd1eec934 < ecf45080a4d3f4526cacb8b14060fe3b49a6913b, >= 122ff243f5f104194750ecbc76d5946dd1eec934 < a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c, >= 122ff243f5f104194750ecbc76d5946dd1eec934 < 5b23a2ff379e70b6b9ff744a972b63e1f8f4d996, >= 122ff243f5f104194750ecbc76d5946dd1eec934 < 8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57, >= 122ff243f5f104194750ecbc76d5946dd1eec934 < 6512c57c4638ddec113bf42439361ba85a12048d, >= 122ff243f5f104194750ecbc76d5946dd1eec934 < a7f4eefb6e1458431eef9fa20fb363320d185f76, >= 122ff243f5f104194750ecbc76d5946dd1eec934 < 155f90be5ee8be5b110ebc0b7da33c54c83b0208, >= 122ff243f5f104194750ecbc76d5946dd1eec934 < 87a1e0fe7776da7ab411be332b4be58ac8840d10, >= 3.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available