Bug 2309860 (CVE-2024-44997)

Summary: CVE-2024-44997 kernel: net: ethernet: mtk_wed: fix use-after-free panic in mtk_wed_setup_tc_block_cb()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the mtk_wed_ops module in the Linux kernel. When there are multiple ap interfaces on one band and with WED on, turning the interface down will cause a kernel panic on MT798X due to a use-after-free, resulting in a denial of service.
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Bug Depends On: 2309915    
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Description OSIDB Bzimport 2024-09-04 20:22:27 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: mtk_wed: fix use-after-free panic in mtk_wed_setup_tc_block_cb()

When there are multiple ap interfaces on one band and with WED on,
turning the interface down will cause a kernel panic on MT798X.

Previously, cb_priv was freed in mtk_wed_setup_tc_block() without
marking NULL,and mtk_wed_setup_tc_block_cb() didn't check the value, too.

Assign NULL after free cb_priv in mtk_wed_setup_tc_block() and check NULL
in mtk_wed_setup_tc_block_cb().

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Unable to handle kernel paging request at virtual address 0072460bca32b4f5
Call trace:
 mtk_wed_setup_tc_block_cb+0x4/0x38
 0xffffffc0794084bc
 tcf_block_playback_offloads+0x70/0x1e8
 tcf_block_unbind+0x6c/0xc8
...
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Comment 1 Robb Gatica 2024-09-04 21:39:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024090449-CVE-2024-44997-2480@gregkh/T