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Vulnerability · Published Jan 19, 2025 · Assigned by Linux

CVE-2025-21636sctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy

Medium 5.5

In plain English

A medium-severity null pointer dereference 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 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 87.7% 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: plpmtud_probe_interval: 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, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.probe_interval' is used.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.128-1DSA-5860-1
Debian:12linux6.1.128-1DEBIAN-CVE-2025-21636
Debian:13linux6.12.10-1DEBIAN-CVE-2025-21636
Debian:14linux6.12.10-1DEBIAN-CVE-2025-21636
Ubuntu:22.04:LTSlinux5.15.0-135.146UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux6.8.0-60.63UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-aws5.15.0-1080.87UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-aws6.8.0-1029.31UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1029.31~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure5.15.0-1084.93UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-azure6.8.0-1029.34UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1012.12~24.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1029.34~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1084.93.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1016.17UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-gcp5.15.0-1079.88UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-gcp6.8.0-1030.32UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1011.11~24.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1030.32~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-gke5.15.0-1077.83UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-gke6.8.0-1025.29UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1062.70UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1012.14UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-21.21~24.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-60.63~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-ibm5.15.0-1072.75UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-ibm6.8.0-1026.26UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1026.26~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-intel-iot-realtime5.15.0-1073.75UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1075.81UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-kvm5.15.0-1076.81UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-135.146UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-60.63.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-60.63.1~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1074.75UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1028.31UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1007.7UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1028.31~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1028.31.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1033.33UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1008.8UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1021.21UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1017.17UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1028.28UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-oracle5.15.0-1077.83UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-oracle6.8.0-1026.27UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1026.27~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-raspi5.15.0-1074.77UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-raspi6.8.0-1028.32UBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-riscv6.8.0-60.63.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-62.65~22.04.1UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-21636
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1017.18UBUNTU-CVE-2025-21636
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1044.48UBUNTU-CVE-2025-21636

Affected products (as reported)

VendorProductVersions
Linux Linux d1e462a7a5f359cbb9a0e8fbfafcfb6657034105 – before 1dc5da6c4178f3e4b95c631418f72de9f86c0449d1e462a7a5f359cbb9a0e8fbfafcfb6657034105 – before 44ee8635922b6eb940faddb961a8347c6857d722d1e462a7a5f359cbb9a0e8fbfafcfb6657034105 – before 284a221f8fa503628432c7bb5108277c688c6ffad1e462a7a5f359cbb9a0e8fbfafcfb6657034105 – before bcf8c60074e81ed2ac2d35130917175a3949c917d1e462a7a5f359cbb9a0e8fbfafcfb6657034105 – before 6259d2484d0ceff42245d1f09cc8cb6ee72d847a
Linux Linux 5.14

Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References