CVE-2026-46289
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk19th percentile — higher than 19% of all known CVEs
Summary
A vulnerability in the Linux kernel related to incorrect length calculations in the extract_kvec_to_sg function has been fixed. These issues could lead to crossing page boundaries and overlapping pointers in the scatterlist.
Risk Assessment
Organizations may be exposed to data integrity issues and potential memory leaks, which could lead to system instability. If exploited, an attacker could gain access to unauthorized memory areas.
Recommendation
It is recommended to update the Linux kernel to version 6.5 or later to patch this vulnerability. Additionally, testing should be conducted to ensure that the fixes have been applied correctly.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: lib/scatterlist: fix length calculations in extract_kvec_to_sg Patch series "Fix bugs in extract_iter_to_sg()", v3. Fix bugs in the kvec and user variants of extract_iter_to_sg. This series is growing due to useful remarks made by sashiko.dev. The main bugs are: - The length for an sglist entry when extracting from a kvec can exceed the number of bytes in the page. This is obviously not intended. - When extracting a user buffer the sglist is temporarily used as a scratch buffer for extracted page pointers. If the sglist already contains some elements this scratch buffer could overlap with existing entries in the sglist. The series adds test cases to the kunit_iov_iter test that demonstrate all of these bugs. Additionally, there is a memory leak fix for the test itself. The bugs were orignally introduced into kernel v6.3 where the function lived in fs/netfs/iterator.c. It was later moved to lib/scatterlist.c in v6.5. Thus the actual fix is only marked for backports to v6.5+. This patch (of 5): When extracting from a kvec to a scatterlist, do not cross page boundaries. The required length was already calculated but not used as intended. Adjust the copied length if the loop runs out of sglist entries without extracting everything. While there, return immediately from extract_iter_to_sg if there are no sglist entries at all. A subsequent commit will add kunit test cases that demonstrate that the patch is necessary.