CVE-2026-98489
Received
Received - Intake
Soft lockup in Linux kernel atl1c driver
Vulnerability report for CVE-2026-98489, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
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:
<TASK>
__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
</TASK>
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 43250ddd75a35d1f7926d989a10fefd30c37eaa7 |
| Linux | Linux | 2.6.29 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
