HighFix available
netfilter: conntrack: revisit gc autotuning
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.15.34, 5.16.20, 5.17.3
- CVEs
- CVE-2022-49110
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 00:17 UTC · Revision 1
Source evidence
netfilter: conntrack: revisit gc autotuning
core-osv · Original sourcePublished 26 Feb 2025, 01:54 UTC
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.
osv:CVE-2022-49110
Kernel
Fixed versions: 5.15.34, 5.16.20, 5.17.3
Complete source record
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"summary": "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.",
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"modified": "2026-10-28T02:30:32.397682833Z",
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