Linux Kernel up to 7.2.5 nf_nat_sip ct_sip_parse_header_uri out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.00+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been rated as very critical. This vulnerability affects the function ct_sip_parse_header_uri of the component nf_nat_sip. Performing a manipulation results in out-of-bounds. This vulnerability was named CVE-2026-100070. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.5. This affects the function ct_sip_parse_header_uri of the component nf_nat_sip. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet sashiko says: If map_addr() changes the packet length, such as when the public NAT IP string is shorter or longer than the internal IP, coff will still point to the offset relative to the pre-mangled packet. If the packet shrinks, coff could overshoot the correct position, potentially causing the next ct_sip_parse_header_uri() call to silently skip bytes and miss subsequent Contact headers. Could this lead to a failure to NAT those subsequent headers and leak internal network details?

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-100070 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/25/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 6828aca3d82717c2fda92af81c0dda642bc2b465/2703f5ea8d85bc729f433ac09ee902084c947122/0f4d30e2e49f343fc28ba1e259fd22969b940c46/810da5a63549531da78348b0a4545042d84e01e2/668cc1c30caedc63070b10d17d5514748988a140/e70d48fcf8382581162608a4a322919bfd22aef3/c408d416618ebb8a95e3097a13f3b793ea9272ee/16aecbe3036f6097c26b51b12e4c1cf207769690 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 6828aca3d82717c2fda92af81c0dda642bc2b465/2703f5ea8d85bc729f433ac09ee902084c947122/0f4d30e2e49f343fc28ba1e259fd22969b940c46/810da5a63549531da78348b0a4545042d84e01e2/668cc1c30caedc63070b10d17d5514748988a140/e70d48fcf8382581162608a4a322919bfd22aef3/c408d416618ebb8a95e3097a13f3b793ea9272ee/16aecbe3036f6097c26b51b12e4c1cf207769690

Timelineinfo

09/25/2026 Advisory disclosed
09/25/2026 +0 days CVE reserved
09/25/2026 +0 days VulDB entry created
09/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-100070 (🔒)
GCVE (CVE): GCVE-0-2026-100070
GCVE (VulDB): GCVE-100-410193

Entryinfo

Created: 09/25/2026 15:32
Changes: 09/25/2026 15:32 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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