CVE-2024-26844 Affecting kernel-syms package, versions <6.4.0-150600.23.7.1
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Test your applications- Snyk ID SNYK-SLES156-KERNELSYMS-7712690
- published 20 Aug 2024
- disclosed 25 Jun 2024
Introduced: 25 Jun 2024
CVE-2024-26844 Open this link in a new tabHow to fix?
Upgrade SLES:15.6 kernel-syms to version 6.4.0-150600.23.7.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-syms package and not the kernel-syms package as distributed by SLES.
See How to fix? for SLES:15.6 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://www.suse.com/security/cve/CVE-2024-26844.html
- https://bugzilla.suse.com/1223015
- 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