CVE-2022-49464: erofs: fix buffer copy overflow of ztailpacking feature
In the Linux kernel, the following vulnerability has been resolved:
erofs: fix buffer copy overflow of ztailpacking feature
I got some KASAN report as below:
[ 46.959738] ================================================================== [ 46.960430] BUG: KASAN: use-after-free in zerofsshiftedtransform+0x2bd/0x370 [ 46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188 ... [ 46.960430] Call Trace: [ 46.960430] <TASK> [ 46.960430] dumpstacklvl+0x41/0x5e [ 46.960430] printreport.cold+0xb2/0x6b7 [ 46.960430] ? zerofsshiftedtransform+0x2bd/0x370 [ 46.960430] kasanreport+0x8a/0x140 [ 46.960430] ? zerofsshiftedtransform+0x2bd/0x370 [ 46.960430] kasancheckrange+0x14d/0x1d0 [ 46.960430] memcpy+0x20/0x60 [ 46.960430] zerofsshiftedtransform+0x2bd/0x370 [ 46.960430] zerofsdecompresspcluster+0xaae/0x1080
The root cause is that the tail pcluster won't be a complete filesystem block anymore. So if ztailpacking is used, the second part of an uncompressed tail pcluster may not be rq->pageofsout.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2022-49464?
CVE-2022-49464 has a medium severity rating, indicating potential issues but not critical threat levels.
What does CVE-2022-49464 affect?
CVE-2022-49464 affects specific versions of the Linux kernel, particularly between versions 5.17 and 5.18.
How do I fix CVE-2022-49464?
To mitigate CVE-2022-49464, upgrade to the latest version of the Linux kernel beyond the vulnerable versions.
What is the nature of the vulnerability in CVE-2022-49464?
CVE-2022-49464 is a buffer copy overflow vulnerability related to the ztailpacking feature in the Linux kernel.
Is CVE-2022-49464 actively exploited?
As of now, there are no confirmed reports of active exploitation for CVE-2022-49464, but it's advisable to apply patches promptly.