CVE-2022-49655

high

Published 2023-05-09 · Modified 2023-05-09

CVSS v3

—

CVSS v2

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VIR risk

8.0

Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2022-49655

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2022-49655.html

vendor Authored 2026-05-27

Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2023:2458

Mitigation details

Source: Red Hat Errata — Red Hat Inc. · View original ↗ · Open-Errata-API

Description kernel: fscache: Fix invalidation/lookup race CVSS v3: 5.3 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L) Errata / fixed releases ProductPackageAdvisoryReleased Red Hat Enterprise Linux 9kernel-0:5.14.0-284.11.1.el9_2RHSA-2023:24582023-05-09T00:00:00Z Red Hat Enterprise Linux 9kernel-0:5.14.0-284.11.1.el9_2RHSA-2023:24582023-05-09T00:00:00Z Package state ProductPackageState Red Hat…

Description

kernel: fscache: Fix invalidation/lookup race

CVSS v3: 5.3 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L)

Errata / fixed releases

Product	Package	Advisory	Released
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-284.11.1.el9_2`	RHSA-2023:2458	2023-05-09T00:00:00Z
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-284.11.1.el9_2`	RHSA-2023:2458	2023-05-09T00:00:00Z

Package state

Product	Package	State
Red Hat Enterprise Linux 10	`kernel`	Not affected
Red Hat Enterprise Linux 6	`kernel`	Out of support scope
Red Hat Enterprise Linux 7	`kernel`	Out of support scope
Red Hat Enterprise Linux 7	`kernel-rt`	Out of support scope
Red Hat Enterprise Linux 8	`kernel`	Not affected
Red Hat Enterprise Linux 8	`kernel-rt`	Not affected
Red Hat Enterprise Linux 9	`kernel-rt`	Affected

Apply commands

bash fix

Apply RHSA-2023:2458 for Red Hat Enterprise Linux 9

yum update -y kernel
# or:
dnf upgrade -y kernel

Affected

Vendor	Product	Version
redhat	Red Hat Enterprise Linux 10	`Not affected`
redhat	Red Hat Enterprise Linux 8	`Not affected`
redhat	Red Hat Enterprise Linux 8	`Not affected`
redhat	Red Hat Enterprise Linux 9	`Affected`

OS impact

OS	Version	Status	Fixed in
rhel	9	fixed
sles		affected
debian	bookworm	fixed	`5.18.14-1`
debian	bullseye	fixed	`0`
debian	forky	fixed	`5.18.14-1`
debian	sid	fixed	`5.18.14-1`
debian	trixie	fixed	`5.18.14-1`

References

Verify integrity in audit chain (admin only). AS-IS.