erofs: ensure valid f_path for page cache sharing (CVE-2026-80697) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80697

erofs: ensure valid f_path for page cache sharing

Answer in brief

CVE-2026-80697 records a Unknown severity vulnerability in erofs: ensure valid f_path for page cache sharing. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=04ba248d02d9eaa3d9077b00a6134caa75fa3e90 <3879657c4ffd81b9a42cf575fc6cb60201032587 \|\| >=e187bc02f8fa4226d62814592cf064ee4557c470 <96b2dbbe58a1ea5df8d29c2fe24b5f04715f4443 \|\| 7368bec565bac3e536cd43579dbde1e715e6ba61 \|\| b2f3d94ea310bea9d36d53e9d9b3f45e86c1d893 \|\| 744b23aa430d52f5c8e4dbff7d71496d6643bed2 \|\| 8344bdf0629457e532797b42d9d2bbf2a2900bbf \|\| 5c942ad7df75925ee166e7f0fb36892d8dde376b \|\| >=5.15.217 <5.16 \|\| >=6.1.184 <6.2 \|\| >=6.6.145 <6.7 \|\| >=6.12.96 <6.13 \|\| >=6.18.39 <6.19	3879657c4ffd81b9a42cf575fc6cb60201032587, 96b2dbbe58a1ea5df8d29c2fe24b5f04715f4443, 5.16, 6.2, 6.7, 6.13, 6.19
Linux/Linuxgeneric	>=7.1.4 <7.1.8	7.1.8

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3879657c4ffd81b9a42cf575fc6cb60201032587; Linux/Linux to 7.1.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.