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NVD / CVE Program· CNA Linux

CVE-2022-49281: cifs: fix handlecache and multiuser

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2fafbc198613823943c106d1ec9b516da692059f, 47178c7722ac528ea08aa82c3ef9ffa178962d7a, e71f6a3a1d5c826a30384fec587ca7503ef6bde5.

Low priority for now. Upgrade to Linux Linux 2fafbc198613823943c106d1ec9b516da692059f, 47178c7722ac528ea08aa82c3ef9ffa178962d7a, e71f6a3a1d5c826a30384fec587ca7503ef6bde5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: cifs: fix handlecache and multiuser In multiuser each individual user has their own tcon structure for the share and thus their own handle for a cached directory. When we umount such a share we much make sure to release the pinned down dentry for each such tcon and not just the master tcon. Otherwise we will get nasty warnings on umount that dentries are still in use: [ 3459.590047] BUG: Dentry 00000000115c6f41{i=12000000019d95,n=/} still in use\ (2) [unmount of cifs cifs] ... [ 3459.590492] Call Trace: [ 3459.590500] d_walk+0x61/0x2a0 [ 3459.590518] ? shrink_lock_dentry.part.0+0xe0/0xe0 [ 3459.590526] shrink_dcache_for_umount+0x49/0x110 [ 3459.590535] generic_shutdown_super+0x1a/0x110 [ 3459.590542] kill_anon_super+0x14/0x30 [ 3459.590549] cifs_kill_sb+0xf5/0x104 [cifs] [ 3459.590773] deactivate_locked_super+0x36/0xa0 [ 3459.590782] cleanup_mnt+0x131/0x190 [ 3459.590789] task_work_run+0x5c/0x90 [ 3459.590798] exit_to_user_mode_loop+0x151/0x160 [ 3459.590809] exit_to_user_mode_prepare+0x83/0xd0 [ 3459.590818] syscall_exit_to_user_mode+0x12/0x30 [ 3459.590828] do_syscall_64+0x48/0x90 [ 3459.590833] entry_SYSCALL_64_after_hwframe+0x44/0xae

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 18th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 5.15.33
  • linux linux kernel5.16 and later · before 5.16.19
  • linux linux kernel5.17 and later · before 5.17.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.13affected
    • 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 and later · before 2fafbc198613823943c106d1ec9b516da692059faffected · git
    • 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 and later · before ffa631c4bff59dde59b598011f570e27dfba3515affected · git
    • 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 and later · before e71f6a3a1d5c826a30384fec587ca7503ef6bde5affected · git
    • 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 and later · before 47178c7722ac528ea08aa82c3ef9ffa178962d7aaffected · git
    • before 5.13not affected · semver
    • 5.15.33 and later · up to and including 5.15.*not affected · semver
    • 5.16.19 and later · up to and including 5.16.*not affected · semver
    • 5.17.2 and later · up to and including 5.17.*not affected · semver
    • 5.18 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.17.3-15.17.3-1
Red Hat:enterprise_linux:9::appstreambpftool-debuginfobefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debug-debuginfobefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debug-develbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfobefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-develbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-devel-matchedbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-docbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-tools-debuginfobefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-develbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-devel-matchedbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamperfbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreamperf-debuginfobefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::appstreampython3-perf-debuginfobefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::baseosbpftoolbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::baseoskernelbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::baseoskernel-abi-stablelistsbefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0
Red Hat:enterprise_linux:9::baseoskernel-corebefore 0:5.14.0-70.30.1.el9_00:5.14.0-70.30.1.el9_0

+14

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-49279Feb 26, 2025 · NFSD: prevent integer overflow on 32 bit systems
    22Monitor
  • ← EarlierCVE-2022-49280Feb 26, 2025 · NFSD: prevent underflow in nfssvc_decode_writeargs()
    22Monitor
  • Later →CVE-2022-49282Feb 26, 2025 · f2fs: quota: fix loop condition at f2fs_quota_sync()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2fafbc198613823943c106d1ec9b516da692059fVendor (CNA)
Linux Linux47178c7722ac528ea08aa82c3ef9ffa178962d7aVendor (CNA)
Linux Linuxe71f6a3a1d5c826a30384fec587ca7503ef6bde5Vendor (CNA)
Linux Linuxffa631c4bff59dde59b598011f570e27dfba3515Vendor (CNA)
debian:linux5.17.3-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-s390x0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-x86_640:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-devel0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-devel-matched0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-doc0:5.14.0-70.30.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records