The brcm80211 component in the Linux kernel through 6.5.10 has a brcmf_cfg80211_detach use-after-free in the device unplugging (disconnect the USB by hotplug) code. For physically proximate attackers with local access, this "could be exploited in a real world scenario." This is related to brcmf_cfg80211_escan_timeout_worker in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://bugzilla.suse.com/show_bug.cgi?id=1216702 | third party advisory issue tracking |
| https://marc.info/?l=linux-kernel&m=169907678011243&w=2 | patch mailing list |
| https://lore.kernel.org/all/20231104054709.716585-1-zyytlz.wz%40163.com/ | patch mailing list |
| https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0f7352557a35ab7888bc7831411ec8a3cbe20d78 | |
| https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html | mailing list |
| https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html | mailing list |