Bug 2084458 (CVE-2022-1652)

Summary: CVE-2022-1652 kernel: A concurrency use-after-free in floppy disk device driver.
Product: [Other] Security Response Reporter: TEJ RATHI <trathi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX 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, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, 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-rc6 Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux kernel’s floppy driver implementation. This flaw allows a local attacker to possibly corrupt memory.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2022-09-02 22:55:52 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:    
Bug Blocks: 2084462, 2090714    

Description TEJ RATHI 2022-05-12 07:59:41 UTC 
A concurrency use-after-free issue was discovered between reset_interrupt and floppy_end_request.

The root cause is that after deallocating current_req in floppy_end_request, reset_interrupt still holds the freed current_req->error_count and accesses it concurrently.  An attacker with a local account in a system that has a floppy disk in use, mounted and has errors may be able to write to memory after having been freed.  By specially curating memory requests, the attacker could place a target memory structure in this location to be modified for abuse.

References:
https://www.openwall.com/lists/oss-security/2022/05/10/1
Comment 7 Product Security DevOps Team 2022-09-02 22:55:47 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-1652