CVE-2021-47066: async_xor: increase src_offs when dropping destination page
First published: Thu Feb 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: async_xor: increase src_offs when dropping destination page Now we support sharing one page if PAGE_SIZE is not equal stripe size. To support this, it needs to support calculating xor value with different offsets for each r5dev. One offset array is used to record those offsets. In RMW mode, parity page is used as a source page. It sets ASYNC_TX_XOR_DROP_DST before calculating xor value in ops_run_prexor5. So it needs to add src_list and src_offs at the same time. Now it only needs src_list. So the xor value which is calculated is wrong. It can cause data corruption problem. I can reproduce this problem 100% on a POWER8 machine. The steps are: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: mount(2) system call failed: Structure needs cleaning.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.10<5.10.37 | |
| Linux Kernel | >=5.11<5.11.21 | |
| Linux Kernel | >=5.12<5.12.4 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-47066?
CVE-2021-47066 is classified as a moderate severity vulnerability affecting the Linux kernel.
How do I fix CVE-2021-47066?
To mitigate CVE-2021-47066, users should upgrade to a patched version of the Linux kernel that is beyond the specified vulnerable versions.
Which versions of the Linux kernel are affected by CVE-2021-47066?
CVE-2021-47066 affects Linux kernel versions 5.10.0 to 5.10.37, 5.11.0 to 5.11.21, and 5.12.0 to 5.12.4.
What type of vulnerability is CVE-2021-47066?
CVE-2021-47066 involves an issue in the async_xor functionality within the Linux kernel.
Is CVE-2021-47066 actively exploited?
There are currently no reports indicating that CVE-2021-47066 is being actively exploited in the wild.
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