PT-2026-128393
Publicado
2026-10-18
·
Atualizado
2026-10-18
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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. An out-of-range value can
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 Mbps Full Duplex>
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 napi threaded poll+0xfd/0x140 kthread+0xf7/0x130 ret from fork+0x2da/0x3a0 ret from fork asm+0x1a/0x30
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