Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: ALSA: serial-u16550: Check card index validity at probe serial-u16550 driver blindly trusts that the given devptr->id value is within the proper card index range at probe. It's OK for the devices the driver itself creates at the module probe time, but if the device is bound manually via sysfs interface, this could be -1 as "none", and this leads to OOB access for index[] and other parameters. Add a sanity check for the card index and warn/correct it if it's a value out of the range.

Affected versions

Linux: 9caf6b5908e1e3b10478e9201ca1be809145253f through before fbf3fb097e66fc1874e54ecc46d600d9325480d6 (git); 9caf6b5908e1e3b10478e9201ca1be809145253f through before 7555e83d7738e65dc83921e3c85bbdc081f08f2f (git); 9caf6b5908e1e3b10478e9201ca1be809145253f through before 6d6fdb24fe2eaf6174fc502284c6e1dc5f7242ba (git); 9caf6b5908e1e3b10478e9201ca1be809145253f through before e0fb960b227fcdebe22e4f26c9486d60943c0424 (git); 2.6.16 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.