CVE-2024-50234

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: iwlegacy: Clear stale interrupts before resuming device

iwl4965 fails upon resume from hibernation on my laptop. The reason

seems to be a stale interrupt which isn't being cleared out before

interrupts are enabled. We end up with a race beween the resume

trying to bring things back up, and the restart work (queued form

the interrupt handler) trying to bring things down. Eventually

the whole thing blows up.

Fix the problem by clearing out any stale interrupts before

interrupts get enabled during resume.

Here's a debug log of the indicent:

[ 12.042589] ieee80211 phy0: il_isr ISR inta 0x00000080, enabled 0xaa00008b, fh 0x00000000

[ 12.042625] ieee80211 phy0: il4965_irq_tasklet inta 0x00000080, enabled 0x00000000, fh 0x00000000

[ 12.042651] iwl4965 0000:10:00.0: RF_KILL bit toggled to enable radio.

[ 12.042653] iwl4965 0000:10:00.0: On demand firmware reload

[ 12.042690] ieee80211 phy0: il4965_irq_taskl

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References