CVE-2026-80697 is a vulnerability in Linux Kernel
Published on August 28, 2026
erofs: ensure valid f_path for page cache sharing
In the Linux kernel, the following vulnerability has been resolved:
erofs: ensure valid f_path for page cache sharing
Previously, backing files for page cache sharing were set up with
f_path left as NULL (only f_inode was valid). It worked, but a recent
mincore fix relies on f_path.mnt and crashes (found by "erofs/028" on
7.2-rc4):
BUG: kernel NULL pointer dereference, address: 0000000000000018
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: Oops: 0000 [#1] SMP PTI
CPU: 3 UID: 0 PID: 675528 Comm: fincore Not tainted 7.2.0-rc4-00002-g[]-dirty #1 PREEMPT(lazy)
Hardware name: Red Hat KVM, BIOS 1.16.0-4.al8 04/01/2014
RIP: 0010:__do_sys_mincore+0xc0/0x2c0
...
Specify valid paths using valid disconnected dentries together with
erofs_ishare_mnt instead of leaving f_path empty, so they are more
like real backing files in a pseudo filesystem and standard
backing_file_open() can be used directly.
Products Associated with CVE-2026-80697
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Affected Versions
Linux:- Version 04ba248d02d9eaa3d9077b00a6134caa75fa3e90 and below 3879657c4ffd81b9a42cf575fc6cb60201032587 is affected.
- Version e187bc02f8fa4226d62814592cf064ee4557c470 and below 96b2dbbe58a1ea5df8d29c2fe24b5f04715f4443 is affected.
- Version 7368bec565bac3e536cd43579dbde1e715e6ba61 is affected.
- Version b2f3d94ea310bea9d36d53e9d9b3f45e86c1d893 is affected.
- Version 744b23aa430d52f5c8e4dbff7d71496d6643bed2 is affected.
- Version 8344bdf0629457e532797b42d9d2bbf2a2900bbf is affected.
- Version 5c942ad7df75925ee166e7f0fb36892d8dde376b is affected.
- Version 5.15.217 and below 5.16 is affected.
- Version 6.1.184 and below 6.2 is affected.
- Version 6.6.145 and below 6.7 is affected.
- Version 6.12.96 and below 6.13 is affected.
- Version 6.18.39 and below 6.19 is affected.
- Version 7.1.4 and below 7.1.8 is affected.