Bug 1226519 (CVE-2024-36974)

Summary: VUL-0: CVE-2024-36974: kernel: net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Davide Benini <davide.benini>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Major    
Priority: P2 - High CC: camila.matos, gabriel.bertazi, meissner
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/411236/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-36974:7.8:(AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---
Bug Depends on:    
Bug Blocks: 1227371    

Description SMASH SMASH 2024-06-19 10:00:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP

If one TCA_TAPRIO_ATTR_PRIOMAP attribute has been provided,
taprio_parse_mqprio_opt() must validate it, or userspace
can inject arbitrary data to the kernel, the second time
taprio_change() is called.

First call (with valid attributes) sets dev->num_tc
to a non zero value.

Second call (with arbitrary mqprio attributes)
returns early from taprio_parse_mqprio_opt()
and bad things can happen.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36974
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-36974.mbox
https://git.kernel.org/stable/c/f921a58ae20852d188f70842431ce6519c4fdc36
https://www.cve.org/CVERecord?id=CVE-2024-36974
https://bugzilla.redhat.com/show_bug.cgi?id=2293003