erofs: ensure valid f_path for page cache sharing

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Summary

CVECVE-2026-80697
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:55 UTC
Updated2026-08-28 16:18:28 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.049950000 (date 2026-08-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5ef3208e3be50aa08b4e7a2832f34e16d42c08b3 3879657c4ffd81b9a42cf575fc6cb60201032587 git Not specified
CNA Linux Linux affected 5ef3208e3be50aa08b4e7a2832f34e16d42c08b3 96b2dbbe58a1ea5df8d29c2fe24b5f04715f4443 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3879657c4ffd81b9a42cf575fc6cb60201032587 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/96b2dbbe58a1ea5df8d29c2fe24b5f04715f4443 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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