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Review reviewCritical

CVE-2026-52986

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...

CVSS
9.8
EPSS
0.55%
42.9% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.55%
Technical severityCVSS 9.8

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 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
Fixed versions
5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-476