CVE-2022-49928: SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed
There is a null-ptr-deref when xps sysfs alloc failed: BUG: KASAN: null-ptr-deref in sysfsdocreatelinksd+0x40/0xd0 Read of size 8 at addr 0000000000000030 by task gssproxy/457
CPU: 5 PID: 457 Comm: gssproxy Not tainted 6.0.0-09040-g02357b27ee03 #9 Call Trace: <TASK> dumpstacklvl+0x34/0x44 kasanreport+0xa3/0x120 sysfsdocreatelinksd+0x40/0xd0 rpcsysfsclientsetup+0x161/0x1b0 rpcnewclient+0x3fc/0x6e0 rpccreatexprt+0x71/0x220 rpccreate+0x1d4/0x350 gssprpccreate+0xc3/0x160 setgsspclnt+0xbc/0x140 writegssp+0x116/0x1a0 procregwrite+0xd6/0x130 vfswrite+0x177/0x690 ksyswrite+0xb9/0x150 dosyscall64+0x35/0x80 entrySYSCALL64afterhwframe+0x46/0xb0
When the xprtswitch sysfs alloc failed, should not add xprt and switch sysfs to it, otherwise, maybe null-ptr-deref; also initialize the 'xpssysfs' to NULL to avoid oops when destroy it.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2022-49928?
CVE-2022-49928 is classified as a medium-severity vulnerability affecting the Linux kernel.
How do I fix CVE-2022-49928?
To fix CVE-2022-49928, update to the latest version of the Linux kernel where the vulnerability has been patched.
What type of vulnerability is CVE-2022-49928?
CVE-2022-49928 is a null pointer dereference vulnerability in the Linux kernel.
What versions of Linux are affected by CVE-2022-49928?
CVE-2022-49928 affects multiple versions of the Linux kernel, particularly those prior to the patch release.
Can CVE-2022-49928 be exploited remotely?
CVE-2022-49928 may allow local attackers to exploit the vulnerability, but it is not characterized as a remote exploitation vulnerability.