net: atl1c: fix soft lockup on out-of-range tpd_cons read

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98489
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:16:59 UTC
Updated2026-10-19 10:19:00 UTC
DescriptionIn 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>

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 e7acd4cdeccbcdfd407adeb72b1eba14d1145b6f git Not specified
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 5ea2576a4f5ec476f33169fdbe9090d2b038ad13 git Not specified
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 4daf80da0c38b8cd92c111ad96cb38322aabf586 git Not specified
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 57b55367b6e3accc55a989afeaf127063e3614dc git Not specified
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 9f2cc71a2e2799d9c993c73f1bd36507eef6ae43 git Not specified
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 586847400b1168a88917287ac02c2c91a620b841 git Not specified
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 d4ab263e40fcf7cfa38a43ec774067d32eb94e16 git Not specified
CNA Linux Linux affected 43250ddd75a35d1f7926d989a10fefd30c37eaa7 36c2009d90f2210ef92e6f4f2850e8b57b09e754 git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9f2cc71a2e2799d9c993c73f1bd36507eef6ae43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57b55367b6e3accc55a989afeaf127063e3614dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/586847400b1168a88917287ac02c2c91a620b841 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/36c2009d90f2210ef92e6f4f2850e8b57b09e754 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e7acd4cdeccbcdfd407adeb72b1eba14d1145b6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d4ab263e40fcf7cfa38a43ec774067d32eb94e16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4daf80da0c38b8cd92c111ad96cb38322aabf586 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ea2576a4f5ec476f33169fdbe9090d2b038ad13 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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