In the Linux kernel, the following vulnerability has been resolved:
net/sched: cls_flow: Dont expose folded kernel pointers
The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct().
Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-debuginfoUpgrade kernelUpgrade perfUpgrade python3-perfUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-modules-extra-commonUpgrade kernel-tools-debuginfoUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-livepatch-6.1.180-225.360Upgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-modules-extraUpgrade kernel-headersUpgrade bpftoolUpgrade kernel-debuginfo-common-x86_64 | Sep 1, 2026 | Aug 15, 2026 |
| Debian | — | Upgrade linux | Aug 16, 2026 | Aug 16, 2026 |
| Redhat_linux | — | No solution exists | Aug 24, 2026 | Aug 15, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 21, 2026 | Aug 15, 2026 |
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