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Linux kernel <6.6.158.1-1> can cause continuous network polling
published 1 month ago
Summary
Versions of the Linux kernel older than 6.6.158.1-1 have a coding mistake in the Ethernet driver that makes the system think there is still work to do even when the network is idle. This can lead to the CPU repeatedly checking the network, wasting resources and potentially slowing other applications. Updating the kernel to the latest version resolves the issue.
What to do
- Update kernel to version 6.6.158.1-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Azure Linux:3 | – | kernel |
< 6.6.158.1-1 Fix: upgrade to 6.6.158.1-1
|
| Azure Linux:3 | azure | kernel | <= 6.6.157.1-1 |
Original advisory text
CVE-2026-97982 affecting package kernel for versions less than 6.6.158.1-1
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: cortina: Fix budget accounting
The gmac_rx() function returns the remaining NAPI budget, but its
caller treats the return value as the number of packets received. An
idle poll therefore reports a full budget and remains scheduled.
Return the number of received packets instead. Preserve the existing
free queue refill accounting by adding that count directly; continuing
to subtract it from the budget would invert the refill behavior.
net: ethernet: cortina: Fix budget accounting
The gmac_rx() function returns the remaining NAPI budget, but its
caller treats the return value as the number of packets received. An
idle poll therefore reports a full budget and remains scheduled.
Return the number of received packets instead. Preserve the existing
free queue refill accounting by adding that count directly; continuing
to subtract it from the budget would invert the refill behavior.
References
Timeline
Published25 Sep 2026
Updated2 Nov 2026
First seen26 Sep 2026
Sources
AZL-104879 · OSV
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