In the Linux kernel, the following vulnerability has been resolved:
net: ipv6: unexport __init-annotated seg6_hmac_init()
EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic.
modpost used to detect it, but it has been broken for a decade.
Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds.
There are two ways to fix it:
- Remove __init - Remove EXPORT_SYMBOL
I chose the latter for this case because the caller (net/ipv6/seg6.c) and the callee (net/ipv6/seg6_hmac.c) belong to the same module. It seems an internal function call in ipv6.ko.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade bpftoolUpgrade perfUpgrade kernel-livepatch-5.10.126-117.518Upgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-4.14.285-215.501Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade bpftool-debuginfoUpgrade python-perf-debuginfoUpgrade python-perfUpgrade kernelUpgrade kernel-toolsUpgrade kernel-livepatch-5.15.50-23.125 | May 21, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-iotUpgrade linux-awsUpgrade linux-gkeopUpgrade linux-raspi-5.4Upgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-azure-5.15Upgrade linux-gcpUpgrade linux-intel-iotg-5.15Upgrade linux-oracleUpgrade linux-azure-5.4Upgrade linux-ibmUpgrade linux-hwe-5.4Upgrade linux-kvmUpgrade linux-azure-4.15Upgrade linux-gcp-5.15Upgrade linux-hweUpgrade linux-gcp-5.4Upgrade linux-azureUpgrade linux-gcp-4.15Upgrade linux-bluefieldUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azure-fipsUpgrade linux-oracle-5.4Upgrade linux-oracle-5.15Upgrade linuxUpgrade linux-realtimeUpgrade linux-aws-hweUpgrade linux-gkeUpgrade linux-fipsUpgrade linux-raspiUpgrade linux-aws-5.4Upgrade linux-nvidiaUpgrade linux-riscv-5.15Upgrade linux-intel-iotgUpgrade linux-hwe-5.15Upgrade linux-aws-5.15Upgrade linux-lowlatencyUpgrade linux-ibm-5.4 | Mar 3, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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