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Vulnerability · Published Jan 19, 2025 · Assigned by Linux

CVE-2025-21638sctp: sysctl: auth_enable: avoid using current->nsproxy

High 7.1

In plain English

A high-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 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.2%top 85.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: auth_enable: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.128-1DEBIAN-CVE-2025-21638
Debian:12linux6.1.128-1DSA-5860-1
Debian:13linux6.12.10-1DEBIAN-CVE-2025-21638
Debian:14linux6.12.10-1DEBIAN-CVE-2025-21638
Ubuntu:22.04:LTSlinux5.15.0-135.146UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux6.8.0-60.63UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-aws5.15.0-1080.87UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-aws6.8.0-1029.31UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1029.31~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure5.15.0-1084.93UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-azure6.8.0-1029.34UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1012.12~24.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1029.34~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1084.93.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1016.17UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-gcp5.15.0-1079.88UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-gcp6.8.0-1030.32UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1011.11~24.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1030.32~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-gke5.15.0-1077.83UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-gke6.8.0-1025.29UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1062.70UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1012.14UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-21.21~24.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-60.63~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-ibm5.15.0-1072.75UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-ibm6.8.0-1026.26UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1026.26~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-intel-iot-realtime5.15.0-1073.75UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1075.81UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-kvm5.15.0-1076.81UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-135.146UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-60.63.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-60.63.1~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1074.75UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1028.31UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1007.7UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1028.31~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1028.31.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1033.33UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1008.8UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1021.21UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1017.17UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1028.28UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-oracle5.15.0-1077.83UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-oracle6.8.0-1026.27UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1026.27~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-raspi5.15.0-1074.77UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-raspi6.8.0-1028.32UBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-riscv6.8.0-60.63.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-62.65~22.04.1UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-21638
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1017.18UBUNTU-CVE-2025-21638
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1044.48UBUNTU-CVE-2025-21638

Affected products (as reported)

VendorProductVersions
Linux Linux b14878ccb7fac0242db82720b784ab62c467c0dc – before cf387cdebfaebae228dfba162f94c567a67610c3b14878ccb7fac0242db82720b784ab62c467c0dc – before dc583e7e5f8515ca489c0df28e4362a70eade382b14878ccb7fac0242db82720b784ab62c467c0dc – before bd2a2939423566c654545fa3e96a656662a0af9eb14878ccb7fac0242db82720b784ab62c467c0dc – before 1b67030d39f2b00f94ac1f0af11ba6657589e4d3b14878ccb7fac0242db82720b784ab62c467c0dc – before 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6b14878ccb7fac0242db82720b784ab62c467c0dc – before c184bc621e3cef03ac9ba81a50dda2dae6a21d36b14878ccb7fac0242db82720b784ab62c467c0dc – before 15649fd5415eda664ef35780c2013adeb5d9c695e5eae4a0511241959498b180fa0df0d4f1b11b9c
Linux Linux 3.15

References