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CVE-2026-43349

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid uninit-value access in f2fs_sanity_check_node_footer syzbot reported a f2fs bug as below: BUG: KMSAN: unini…

Published May 8, 2026CWE-908EPSS 0.16%

Overview

CVE-2026-43349 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to avoid uninit-value access in f2fs_sanity_check_node_footer

syzbot reported a f2fs bug as below:

BUG: KMSAN: uninit-value in f2fs_sanity_check_node_footer+0x374/0xa20 fs/f2fs/node.c:1520

f2fs_sanity_check_node_footer+0x374/0xa20 fs/f2fs/node.c:1520

f2fs_finish_read_bio+0xe1e/0x1d60 fs/f2fs/data.c:177

f2fs_read_end_io+0x6ab/0x2220 fs/f2fs/data.c:-1

bio_endio+0x1006/0x1160 block/bio.c:1792

submit_bio_noacct+0x533/0x2960 block/blk-core.c:891

submit_bio+0x57a/0x620 block/blk-core.c:926

blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline]

f2fs_submit_read_bio+0x12c/0x360 fs/f2fs/data.c:557

f2fs_submit_page_bio+0xee2/0x1450 fs/f2fs/data.c:775

read_node_folio+0x384/0x4b0 fs/f2fs/node.c:1481

__get_node_folio+0x5db/0x15d0 fs/f2fs/node.c:1576

f2fs_get_inode_folio+0x40/0x50 fs/f2fs/node.c:1623

do_read_inode fs/f2fs/inode.c:425 [inline]

f2fs_iget+0x1209/0x9380 fs/f2fs/inode.c:596

f2fs_fill_su

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/59970b2586fef4b13e96527b9d232bed30b640cdRefgit.kernel.org/stable/c/7b9161a605e91d0987e2596a245dc1f21621b23fRefgit.kernel.org/stable/c/a10b89343d41ceee1af0ec38d3a74e526c77fa09

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43349?

CVE-2026-43349 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43349?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43349?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43349?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43349 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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