Description
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix mismatched free of HalData in rtw_sdio_if1_init() padapter->HalData is allocated via vzalloc(), but incorrectly freed using kfree() in the rtw_sdio_if1_init() error path. Using kfree() to release this vmalloc-backed buffer can lead to memory corruption. Use rtw_hal_data_deinit() to pair the free correctly and free HalData with vfree(). The bug was first flagged by an experimental static analysis tool we are developing for kernel memory-management bugs. Manual inspection confirms that the issue is still present in current mainline. An x86_64 allyesconfig build showed no new warnings. As we do not have suitable RTL8723BS SDIO hardware to test with, no runtime testing was able to be performed.
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/264676418b726baca7be49171e306b6aa05cceb0 Patch
- git.kernel.org/stable/c/423574feaed192063ef0cd0813fb85425f39e539 Patch
- git.kernel.org/stable/c/4520d673d49dabfd42c008a33889251025f7d6d5 Patch
- git.kernel.org/stable/c/6c017ab2b0e1b60b5be94636c94720347213d78b Patch
- git.kernel.org/stable/c/737c928ff5092d7e55128a232c231248fc993777 Patch
- git.kernel.org/stable/c/911190f0b9511c3c81f2f2484414c1ae26f636b3 Patch
- git.kernel.org/stable/c/d6158333d630a1b21d8914feaf77a6f5deb185d9 Patch
- git.kernel.org/stable/c/ff6d1ba247b5c62bdb678f1069abc86ad88a1402 Patch
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 1 · as of 9 November 2026
- CWE
- CWE-763
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