In the Linux kernel, the following vulnerability has been resolved:
net: shaper: protect late read accesses to the hierarchy
We look up a netdev during prep of Netlink ops (pre- callbacks) and take a ref to it. Then later in the body of the callback we take its lock or RCU which are the actual protections.
This is not proper, a conversion from a ref to a locked netdev must include a liveness check (a check if the netdev hasn't been unregistered already). Fix the read cases (those under RCU). Writes needs a separate change to protect from creating the hierarchy after flush has already run.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-livepatch-6.18.20-20.229Upgrade kernel6.18-modules-extraUpgrade kernel6.18-develUpgrade kernel6.18-headersUpgrade kernel6.18-libbpfUpgrade kernel6.18-toolsUpgrade kernel6.18Upgrade kernel6.18-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.18-modules-extra-commonUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-libbpf-develUpgrade kernel6.18-tools-develUpgrade kernel6.18-debuginfo-common-x86_64Upgrade python3-perf6.18Upgrade perf6.18Upgrade kernel6.18-tools-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-libbpf-staticUpgrade bpftool6.18Upgrade kernel6.18-libbpf-debuginfo | May 4, 2026 | Apr 3, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Apr 3, 2026 |
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