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Vulnerability · Published Sep 25, 2026 · Assigned by Linux

CVE-2026-100070netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.1%top 98.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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?

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.190-1DEBIAN-CVE-2026-100070
Debian:13linux6.12.111-1DEBIAN-CVE-2026-100070
Debian:14linux7.2.6-1DEBIAN-CVE-2026-100070
Debian:12linux-6.126.12.111-1~deb12u1DEBIAN-CVE-2026-100070
Ubuntu:22.04:LTSlinux5.15.0-202.212UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux7.0.0-42.42USN-8959-1
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-aws5.15.0-1119.126UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17USN-8959-1
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure5.15.0-1125.134UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1124.133UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-gcp5.15.0-1120.130UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18USN-8959-1
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-gke5.15.0-1115.121UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1102.110UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1USN-8959-1
Ubuntu:22.04:LTSlinux-ibm5.15.0-1113.117UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17USN-8959-1
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1114.120UBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-kvm5.15.0-1111.116UBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-197.207UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1114.115UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1070.72UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1059.59UBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17USN-8960-1
Ubuntu:22.04:LTSlinux-oracle5.15.0-1116.122UBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16USN-8959-1
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-100070
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-100070
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-100070
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-100070

Affected products (as reported)

VendorProductVersions
Linux Linux c978cd3a937141deaf7995b849824af6dacdeae7 – before 6828aca3d82717c2fda92af81c0dda642bc2b465c978cd3a937141deaf7995b849824af6dacdeae7 – before 2703f5ea8d85bc729f433ac09ee902084c947122c978cd3a937141deaf7995b849824af6dacdeae7 – before 0f4d30e2e49f343fc28ba1e259fd22969b940c46c978cd3a937141deaf7995b849824af6dacdeae7 – before 810da5a63549531da78348b0a4545042d84e01e2c978cd3a937141deaf7995b849824af6dacdeae7 – before 668cc1c30caedc63070b10d17d5514748988a140c978cd3a937141deaf7995b849824af6dacdeae7 – before e70d48fcf8382581162608a4a322919bfd22aef3c978cd3a937141deaf7995b849824af6dacdeae7 – before c408d416618ebb8a95e3097a13f3b793ea9272eec978cd3a937141deaf7995b849824af6dacdeae7 – before 16aecbe3036f6097c26b51b12e4c1cf207769690
Linux Linux 2.6.26

References