CVE-2024-56539: wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_config_scan()
In the Linux kernel, the following vulnerability has been resolved:
wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiexconfigscan()
Replace one-element array with a flexible-array member in struct mwifiexietypeswildcardssidparams to fix the following warning on a MT8173 Chromebook (mt8173-elm-hana):
[ 356.775250] ------------[ cut here ]------------ [ 356.784543] memcpy: detected field-spanning write (size 6) of single field "wildcardssidtlv->ssid" at drivers/net/wireless/marvell/mwifiex/scan.c:904 (size 1) [ 356.813403] WARNING: CPU: 3 PID: 742 at drivers/net/wireless/marvell/mwifiex/scan.c:904 mwifiexscannetworks+0x4fc/0xf28 [mwifiex]
The "(size 6)" above is exactly the length of the SSID of the network this device was connected to. The source of the warning looks like:
ssidlen = userscanin->ssidlist[i].ssidlen; [...] memcpy(wildcardssidtlv->ssid, userscanin->ssidlist[i].ssid, ssidlen);
There is a #define WILDCARDSSIDTLVMAXSIZE that uses sizeof() on this struct, but it already didn't account for the size of the one-element array, so it doesn't need to be changed.
Other sources
This CVE was automatically created from a reference found in an email or other text. If you are reading this, then this CVE entry is probably erroneous, since this text should be replaced by the official CVE description automatically.
— Launchpad
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-56539?
CVE-2024-56539 has a medium severity rating due to potential risks associated with memory corruption.
How do I fix CVE-2024-56539?
To fix CVE-2024-56539, update to the latest version of the Linux kernel that includes the patch addressing this vulnerability.
What are the potential impacts of CVE-2024-56539?
The potential impacts of CVE-2024-56539 include system instability and possible exploitation leading to unauthorized access.
Which versions of the Linux kernel are affected by CVE-2024-56539?
CVE-2024-56539 affects multiple versions of the Linux kernel prior to the patch being applied.
Who is responsible for resolving CVE-2024-56539?
The Linux kernel development community is responsible for resolving CVE-2024-56539 through updates and patches.