Data Element containing Pointer Item without Proper Copy Control Element Affecting kernel package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNEL-6638235
- published 18 Apr 2024
- disclosed 17 Apr 2024
Introduced: 17 Apr 2024
CVE-2024-26844 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:7 kernel.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2024-26844
- https://git.kernel.org/stable/c/0f1bae071de9967602807472921829a54b2e5956
- https://git.kernel.org/stable/c/13f3956eb5681a4045a8dfdef48df5dc4d9f58a6
- https://git.kernel.org/stable/c/8fc80874103a5c20aebdc2401361aa01c817f75b
- https://git.kernel.org/stable/c/cbaf9be337f7da25742acfce325119e3395b1f1b