In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: revisit gc autotuning
as of commit 4608fdfc07e1 ("netfilter: conntrack: collect all entries in one cycle") conntrack gc was changed to run every 2 minutes.
On systems where conntrack hash table is set to large value, most evictions happen from gc worker rather than the packet path due to hash table distribution.
This causes netlink event overflows when events are collected.
This change collects average expiry of scanned entries and reschedules to the average remaining value, within 1 to 60 second interval.
To avoid event overflows, reschedule after each bucket and add a limit for both run time and number of evictions per run.
If more entries have to be evicted, reschedule and restart 1 jiffy into the future.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade bpftoolUpgrade python3-perfUpgrade kernel | Nov 12, 2025 | Oct 23, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-tools-libsUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perf | Oct 24, 2025 | Oct 23, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-oracleUpgrade linux-azure-5.15Upgrade linux-kvmUpgrade linux-gkeUpgrade linux-raspiUpgrade linux-lowlatencyUpgrade linux-intel-iotgUpgrade linux-lowlatency-hwe-5.15Upgrade linux-hwe-5.15Upgrade linux-realtimeUpgrade linux-awsUpgrade linux-gcpUpgrade linux-ibmUpgrade linux-intel-iotg-5.15Upgrade linuxUpgrade linux-azure | Mar 19, 2025 | Feb 26, 2025 |
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