CVE-2026-52986 remediation guide
Linux Linux, linux kernel
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: don't use simple_strtoul Replace unsafe port parsing in epaddr_len(), ct_sip_parse_header_uri(), and ct_sip_parse_request() with a new sip_parse_port() helper that validates each digit against the buffer limit, eliminating the use of simple_strtoul() which assumes NUL-terminated strings. The previous code dereferenced pointers without bounds checks after sip_parse_addr() and relied on simple_strtoul() on non-NUL-terminated skb data. A port that reaches the buffer limit without a trailing charact...
Identify the affected asset
Confirm whether Linux Linux, linux kernel is installed, record the deployed version and installation path, and identify exposed interfaces.
- Record the product name, package or appliance identifier, and installed version.
- Identify internet-facing, administrative, API, and internal access paths.
- Preserve the pre-change configuration and relevant service logs.
Validate the affected-version match
Compare the deployed version with the affected range: >= 05e3ced297fe755093140e7487e292fb7603316e < 8cd0358379570003659186706e077929d6930c40, >= 05e3ced297fe755093140e7487e292fb7603316e < 9c6afcb1c3cbb2c0da65b8515ac14d7273872f84, >= 05e3ced297fe755093140e7487e292fb7603316e < b3264c977e79d8a25778d4fd11520f00fea1329c, >= 05e3ced297fe755093140e7487e292fb7603316e < ea2ecd29b8f4433e52607192ca91084f95787ca0, >= 05e3ced297fe755093140e7487e292fb7603316e < 9f69c323ae0ab517e595c2cc74e0ae0d9d085611, >= 05e3ced297fe755093140e7487e292fb7603316e < 7df9863bf538a626e8a684e59cb2c43eac0ef3c8, >= 05e3ced297fe755093140e7487e292fb7603316e < 523762e3b6933fff81f01dfa3c60c0774044cdab, >= 05e3ced297fe755093140e7487e292fb7603316e < 8cf6809cddcbe301aedfc6b51bcd4944d45795f6, >= 2.6.26, >= 2.6.26 < 5.10.258, >= 5.11 < 5.15.209, >= 5.16 < 6.1.175, >= 6.2 < 6.6.141, >= 6.7 < 6.12.91, >= 6.13 < 6.18.33, >= 6.19 < 7.0.10, 7.1. Treat incomplete inventory results as unresolved.
Prioritize with independent signals
The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.
Apply supported remediation
Follow the vendor advisory or supported update path. Current fixed-version status: 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10. Preserve configuration and rollback material before change.
Verify the result
Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.
- Confirm the expected version and package state.
- Run a functional health check for critical service paths.
- Review authentication, error, application, and security monitoring logs.
- Reassess exposure if the supported fix cannot be applied.
Operational boundary
This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.