CVE-2024-26844

block: Fix WARNING in _copy_from_iter

Description

In the Linux kernel, the following vulnerability has been resolved: block: Fix WARNING in _copy_from_iter Syzkaller reports a warning in _copy_from_iter because an iov_iter is supposedly used in the wrong direction. The reason is that syzcaller managed to generate a request with a transfer direction of SG_DXFER_TO_FROM_DEV. This instructs the kernel to copy user buffers into the kernel, read into the copied buffers and then copy the data back to user space. Thus the iovec is used in both directions. Detect this situation in the block layer and construct a new iterator with the correct direction for the copy-in.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.05%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/8fc80874103a5c20aebdc2401361aa01c817f75b	patch
https://git.kernel.org/stable/c/0f1bae071de9967602807472921829a54b2e5956	patch
https://git.kernel.org/stable/c/cbaf9be337f7da25742acfce325119e3395b1f1b	patch
https://git.kernel.org/stable/c/13f3956eb5681a4045a8dfdef48df5dc4d9f58a6	patch

Frequently Asked Questions

What is the severity of CVE-2024-26844?: CVE-2024-26844 has been scored as a medium severity vulnerability.
How to fix CVE-2024-26844?: To fix CVE-2024-26844, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-26844 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-26844 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-26844?: CVE-2024-26844 affects Linux Linux, Linux Linux.

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