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NVD / CVE Program· CNA Linux

CVE-2022-49418: NFSv4: Fix free of uninitialized nfs4_label on referral lookup.

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: 0.53% (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 6015292653d95ba9f72906e2b65e536aa5807d64, c3ed222745d9ad7b69299b349a64ba533c64a34f.
  • Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 6015292653d95ba9f72906e2b65e536aa5807d64, c3ed222745d9ad7b69299b349a64ba533c64a34f 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: NFSv4: Fix free of uninitialized nfs4_label on referral lookup. Send along the already-allocated fattr along with nfs4_fs_locations, and drop the memcpy of fattr. We end up growing two more allocations, but this fixes up a crash as: PID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: "ls" #0 [ffffc90000857920] panic at ffffffff81b9bfde #1 [ffffc900008579c0] do_trap at ffffffff81023a9b #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78 #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45 #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs] #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f #7 [ffffc90000857c60] walk_component at ffffffff813a86c4 #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553 #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Aug 5, 2026
EPSS
0.5% · 44th percentile

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 · 0.5%

CNA vs NVD score

NVD
5.5
CNA · Linux
9.8
4.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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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 kernel5.16 and later · before 5.18.3

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

    • 5.16affected
    • 9558a007dbc383d48e7f5a123d0b5ff656c71068 and later · before 6015292653d95ba9f72906e2b65e536aa5807d64affected · git
    • 9558a007dbc383d48e7f5a123d0b5ff656c71068 and later · before c3ed222745d9ad7b69299b349a64ba533c64a34faffected · git
    • before 5.16not affected · semver
    • 5.18.3 and later · up to and including 5.18.*not affected · semver
    • 5.19 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 5.18.5-15.18.5-1
Red Hat:enterprise_linux:9::appstreambpftool-debuginfobefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debug-debuginfobefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debug-develbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfobefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-develbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-devel-matchedbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-docbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-tools-debuginfobefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-develbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-devel-matchedbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamperfbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreamperf-debuginfobefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::appstreampython3-perf-debuginfobefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::baseosbpftoolbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::baseoskernelbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::baseoskernel-abi-stablelistsbefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.el9_0
Red Hat:enterprise_linux:9::baseoskernel-corebefore 0:5.14.0-70.22.1.el9_00:5.14.0-70.22.1.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-2022-49416Feb 26, 2025 · wifi: mac80211: fix use-after-free in chanctx code
    35Monitor
  • ← EarlierCVE-2022-49417Feb 26, 2025 · iwlwifi: mei: fix potential NULL-ptr deref
    22Monitor
  • Later →CVE-2022-49419Feb 26, 2025 · video: fbdev: vesafb: Fix a use-after-free due early fb_info cleanup
    31Monitor

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 Linux6015292653d95ba9f72906e2b65e536aa5807d64Vendor (CNA)
Linux Linuxc3ed222745d9ad7b69299b349a64ba533c64a34fVendor (CNA)
debian:linux5.18.5-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-s390x0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-x86_640:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-devel0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-devel-matched0:5.14.0-70.22.1.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-doc0:5.14.0-70.22.1.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.

No history yet (it accumulates with the daily EPSS job).

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.

  • CVE-2024-5030299 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2026-52989483 days apartnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
    39Monitor
  • CVE-2024-47685128 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()
    36Monitor
  • CVE-2026-53225484 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
    36Monitor
  • CVE-2026-53170484 days apartaccel/ethosu: reject DMA commands with uninitialized length
    35Monitor
  • CVE-2026-43139434 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()
    34Monitor

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)

CWE-908 · Use of Uninitialized Resource

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 (1 more)

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

All records