Bug 1220741 (CVE-2021-47064)

Summary: VUL-0: CVE-2021-47064: kernel: mt76: potential DMA mapping leak due to uninitialized stack variable
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Kernel Bugs <kernel-bugs>
Status: RESOLVED FIXED QA Contact: Security Team bot <security-team>
Severity: Minor    
Priority: P5 - None CC: carlos.lopez
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/395875/
Whiteboard: CVSSv3.1:SUSE:CVE-2021-47064:3.6:(AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-03-01 09:39:26 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mt76: fix potential DMA mapping leak

With buf uninitialized in mt76_dma_tx_queue_skb_raw, its field skip_unmap
could potentially inherit a non-zero value from stack garbage.
If this happens, it will cause DMA mappings for MCU command frames to not be
unmapped after completion

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47064
https://www.cve.org/CVERecord?id=CVE-2021-47064
https://git.kernel.org/stable/c/91b9548d413fda488ea853cd1b9f59b572db3a0c
https://git.kernel.org/stable/c/9b68ce2856dadc0e1cb6fd21fbeb850da49efd08
https://git.kernel.org/stable/c/9fa26701cd1fc4d932d431971efc5746325bdfce
https://git.kernel.org/stable/c/b4403cee6400c5f679e9c4a82b91d61aa961eccf
https://bugzilla.redhat.com/show_bug.cgi?id=2267167
Comment 1 Carlos López 2024-03-01 09:40:14 UTC 
Already fixed in cve/linux-5.14 and newer, older branches not affected. Closing.