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CVE-2026-63819

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on f2fs_get_node_folio_ra() kernel BUG at fs/f2fs/file.c:845!

Published Jul 19, 2026EPSS 0.13%

Overview

CVE-2026-63819 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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 do sanity check on f2fs_get_node_folio_ra()

kernel BUG at fs/f2fs/file.c:845!

Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI

CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014

RIP: 0010:f2fs_do_truncate_blocks+0x1115/0x1140 fs/f2fs/file.c:845

Code: fc fc 90 0f 0b e8 8b 9d 9a fd 90 0f 0b e8 83 9d 9a fd 48 89 df 48 c7 c6 60 d1 1a 8c e8 54 f1 fc fc 90 0f 0b e8 6c 9d 9a fd 90 <0f> 0b e8 64 9d 9a fd 90 0f 0b 90 e9 93 fd ff ff e8 56 9d 9a fd 90

RSP: 0018:ffffc9000e4474c0 EFLAGS: 00010283

RAX: ffffffff842b1d34 RBX: 0000000000000003 RCX: 0000000000100000

RDX: ffffc9000f03a000 RSI: 0000000000035503 RDI: 0000000000035504

RBP: ffffc9000e447608 R08: ffff8880123b0000 R09: 0000000000000002

R10: 00000000fffffffe R11: 0000000000000002 R12: 0000000000000001

R13: 0000000000000000 R14: 1ffff92001c88ea0 R15:

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/0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73Refgit.kernel.org/stable/c/406c28af75123432d38cf9bbaa6f1476f7b14770Refgit.kernel.org/stable/c/8712353ed80f87271d732297567dcdbe4b84e8c7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63819?

CVE-2026-63819 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-63819?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-63819?

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-2026-63819?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63819 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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