Bug 2083992 (CVE-2022-1671)

Summary: CVE-2022-1671 kernel: null-ptr-deref bugs in net/rxrpc/server_key.c in rxrpc_preparse_s
Product: [Other] Security Response Reporter: Rohit Keshri <rkeshri>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, adscvr, airlied, alciregi, bdettelb, bhu, bskeggs, chwhite, crwood, ddepaula, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, hpa, jarod, jarodwilson, jburrell, jfaracco, jferlan, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jpazdziora, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, pmatouse, ptalbert, qzhao, rvrbovsk, scweaver, steved, vkumar, walters, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 5.18 rc1 Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference flaw was found in rxrpc_preparse_s in net/rxrpc/server_key.c in the Linux kernel. This flaw allows a local attacker to crash the system or leak internal kernel information.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2022-08-29 10:02:36 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2084037, 2084038    
Bug Blocks: 2083989, 2084035    

Description Rohit Keshri 2022-05-11 07:42:33 UTC 
There are some null-ptr-deref bugs in server_key.c in net/rxrpc/server_key.c in the latest kernel, unprivileged users can easily trigger it via ioctl.

#Root Cause
Some function calls are not implemented in rxrpc_no_security, there are preparse_server_key, free_preparse_server_key and destroy_server_key.

When rxrpc security type is rxrpc_no_security, unprivileged users can easily trigger a null-ptr-deref bug via ioctl. So judgment should be added to prevent it