Advisory [CVE-2026-98489] Proxmox VE: In the Linux kernel, the following vulnerability has been resolved: net: atl1c: fix soft lockup on out-of-range tpd_cons read The hardware can report an out-of-range tpd_cons (seen as 0xffff) while the PCIe link/MAC is resetting
This security Proxmox advisory covers CVE-2026-98489; related products: Proxmox VE, Proxmox.
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Summary
In the Linux kernel, the following vulnerability has been resolved:
net: atl1c: fix soft lockup on out-of-range tpd_cons read
The hardware can report an out-of-range tpd_cons (seen as 0xffff) while the PCIe link/MAC is resetting.
never be reached and the loop below would spin forever. To avoid
a soft lockup treat it as "nothing new to clean" instead.
Reproduced on two machines, same NIC (Qualcomm Atheros AR8151 v2.0, 4-port), triggered by rebooting a Mikrotik CCR2004 PCIe card that
the ports are directly linked to:
- Ubuntu 26.04.1 LTS, kernel 7.0.0-31-generic. The link-flap
precursor, before the lockup was captured with a full trace elsewhere:
atl1c 0000:05:00.0 enp5s0f0: NETDEV WATCHDOG: CPU: 4: transmit queue 2 timed out 489984 ms atl1c 0000:05:00.0: MAC state machine can't be idle since disabled for 10ms second
atl1c 0000:05:00.0: atl1c: enp5s0f0 NIC Link is Up
65535 (0xffff) here is the same value tpd_cons reads back once the loop below gets stuck.
- Proxmox VE, kernel 7.0.14-11-pve. Same NIC/trigger, this time
caught by the soft lockup watchdog with a full stack trace:
watchdog: BUG: soft lockup - CPU#12 stuck for 354s! [napi/eth%d-0:329] CPU: 12 UID: 0 PID: 329 Comm: napi/eth%d-0 Tainted: P O L 7.0.14-11-pve #1 PREEMPT(lazy)
RIP: 0010:atl1c_clean_tx+0x142/0x2d0 [atl1c] Call Trace:
__napi_poll+0x32/0x1e0 napi_threaded_poll_loop+0x286/0x2e0
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
NVD record · medium-confidence parse· fetched 1 day ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
NVD record · medium-confidence parse· fetched 1 day ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
NVD record · medium-confidence parse· fetched 1 day ago·verify at source
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