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CVE-2026-74723

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: btrfs: lzo: reject inline extents without valid headers [BUG] For a crafted btrfs image, the following KASAN can be triggered w…

Published Aug 22, 2026EPSS 0.65%

Overview

CVE-2026-74723 is a critical-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

btrfs: lzo: reject inline extents without valid headers

[BUG]

For a crafted btrfs image, the following KASAN can be triggered when

reading an inline lzo compressed file extent:

BUG: KASAN: slab-out-of-bounds in lzo_decompress+0x57d/0x700

Read of size 4 at addr ffff888006f2e644 by task btrfs_lzo_inlin/77

Call Trace:

<TASK>

dump_stack_lvl+0x5b/0x70

print_report+0xd1/0x610

kasan_report+0xe0/0x110

__asan_report_load_n_noabort+0x13/0x20

lzo_decompress+0x57d/0x700

btrfs_decompress+0x140/0x1c0

uncompress_inline+0x147/0x1b0

btrfs_get_extent+0xb23/0x10a0

btrfs_do_readpage.constprop.0+0x538/0x1ac0

btrfs_readahead+0x32f/0x5f0

read_pages+0x16f/0x850

page_cache_ra_unbounded+0x296/0x490

do_page_cache_ra+0xd9/0x130

page_cache_sync_ra+0x3ee/0x6f0

filemap_get_pages+0x306/0x15c0

filemap_read+0x329/0xd00

btrfs_file_read_iter+0x1f8/0x2b0

vfs_read+0x4ef/0x720

ksys_read+0

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/0fa78ef637deb5dbe341582f88553a4bce496de0Refgit.kernel.org/stable/c/fc50b475ad27f50b4dcc98fc4c44e8802bc1b248

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74723?

CVE-2026-74723 is a critical-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-74723?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-74723?

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-2026-74723?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74723 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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