CVE-2022-49655

published 2025-02-26

CVE-2022-49655: In the Linux kernel, the following vulnerability has been resolved: fscache: Fix invalidation/lookup race If an NFS file is opened for writing and closed…

Priority P4 16 medium 4.7 CVSS 3.1

AV L AC H PR L UI N S U C N I N A H

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

fscache: Fix invalidation/lookup race

If an NFS file is opened for writing and closed, fscache_invalidate() will
be asked to invalidate the file - however, if the cookie is in the
LOOKING_UP state (or the CREATING state), then request to invalidate
doesn't get recorded for fscache_cookie_state_machine() to do something
with.

Fix this by making __fscache_invalidate() set a flag if it sees the cookie
is in the LOOKING_UP state to indicate that we need to go to invalidation.
Note that this requires a count on the n_accesses counter for the state
machine, which that will release when it's done.

fscache_cookie_state_machine() then shifts to the INVALIDATING state if it
sees the flag.

Without this, an nfs file can get corrupted if it gets modified locally and
then read locally as the cache contents may not get updated.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.14-1 (bookworm)	linux 5.18.14-1 (bookworm)
linux	linux	—	—
linux	linux	>= d24af13e2e2358a602740c7817ea90da43d3e740 < b1ae9f617f8a5c848d9205b8e228c6f0d1af754b	b1ae9f617f8a5c848d9205b8e228c6f0d1af754b
linux	linux	>= d24af13e2e2358a602740c7817ea90da43d3e740 < 85e4ea1049c70fb99de5c6057e835d151fb647da	85e4ea1049c70fb99de5c6057e835d151fb647da
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.18.14-1	5.18.14-1
linux	linux_kernel	>= 0 < 5.18.14-1	5.18.14-1
linux	linux_kernel	>= 0 < 5.18.14-1	5.18.14-1
linux	linux_kernel	>= 5.17 < 5.18.11	5.18.11

CVSS provenance

nvd v3.1 4.7 MEDIUM CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 4.7 MEDIUM

vendor_debian 4.7 MEDIUM

vendor_redhat 4.7 MEDIUM

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