CVE-2026-80734

/// Technical description

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

btrfs: initialize inode mapping flags for cached inodes

[BUG]

When running generic/795 with 8K block size, 4K page size, the test

always fails, triggering some ASSERT()s related to folio size:

795 (241074): drop_caches: 3

assertion failed: IS_ALIGNED(start, blocksize) && IS_ALIGNED(end + 1, blocksize), in extent_io.c:1404 (blocksize=8192 root=262 ino=258 start=16826368 end=16830463 mapping min order=0)

------------[ cut here ]------------

kernel BUG at extent_io.c:1404!

Oops: invalid opcode: 0000 [#1] SMP

CPU: 8 UID: 0 PID: 241105 Comm: fsstress Tainted: G OE 7.2.0-rc5-custom+ #442 PREEMPT(full) f4bfb352566f3949f29c233ce6f735050a03b245

Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022

RIP: 0010:assert_folio_range.cold+0x3d/0x3f [btrfs]

Call Trace:

<TASK>

btrfs_read_folio+0x9e/0x170 [btrfs 4cd1dd93b341b8e

/// 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