Critical 9.8Published Jun 8, 2026

CVE-2026-46289lib/scatterlist: fix length calculations in extract_kvec_to_sg

Updated under an hour ago (Oct 27, 2026, 10:23 AM ET)

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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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	0185846975339a5c348373aa450a977f5242366b builds before 3f17500e86d730c76db638bb3ae52f9b5e496c76; from 0185846975339a5c348373aa450a977f5242366b before e5e22fc9963469e678c4f4bb38d26adcec107f1e; 0185846975339a5c348373aa450a977f5242366b builds before 8fbba6829057979149d1b37d65690c037f3ddf4d; 0185846975339a5c348373aa450a977f5242366b builds before 9d38756d0a93b66163554219fa9c3365f40c4035; 0185846975339a5c348373aa450a977f5242366b builds before 07b7d66e65d9cfe6b9c2c34aa22cfcaac37a5c45	CNA record
linux linux_kernel linux:linux_kernel	from 6.3 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7	NVD

References

References

https://git.kernel.org/stable/c/3f17500e86d730c76db638bb3ae52f9b5e496c76	patch
https://git.kernel.org/stable/c/e5e22fc9963469e678c4f4bb38d26adcec107f1e	patch
https://git.kernel.org/stable/c/8fbba6829057979149d1b37d65690c037f3ddf4d	patch
https://git.kernel.org/stable/c/9d38756d0a93b66163554219fa9c3365f40c4035	patch
https://git.kernel.org/stable/c/07b7d66e65d9cfe6b9c2c34aa22cfcaac37a5c45	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.