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NVD / CVE Program· CNA Linux

CVE-2024-53217: NFSD: Prevent NULL dereference in nfsd4_process_cb_update()

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.73% (FIRST EPSS); higher than 54.7% of all records.
  • 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 03178cd8f67227015debb700123987fe96275cd1, 0c3b0e326f838787d229314d4de83af9c53347e8, 1e02c641c3a43c88cecc08402000418e15578d38; cbl2 kernel 5.15.173.1-2 on CBL Mariner 2.0 5.15.176.3-1; cbl2 kernel 5.15.173.1-2 on CBL-Mariner 2.0 5.15.176.3-1.
  • Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 03178cd8f67227015debb700123987fe96275cd1, 0c3b0e326f838787d229314d4de83af9c53347e8, 1e02c641c3a43c88cecc08402000418e15578d38; cbl2 kernel 5.15.173.1-2 on CBL Mariner 2.0 5.15.176.3-1; cbl2 kernel 5.15.173.1-2 on CBL-Mariner 2.0 5.15.176.3-1 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: NFSD: Prevent NULL dereference in nfsd4_process_cb_update() @ses is initialized to NULL. If __nfsd4_find_backchannel() finds no available backchannel session, setup_callback_client() will try to dereference @ses and segfault.

Published
Dec 27, 2024
Updated
Oct 15, 2026
EPSS
0.7% · 54th 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 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.5
2.0 point gap

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

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

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-53217

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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

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

    • 2.6.38affected
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before d9a0d1f6e15859ea7a86a327f28491e23deaaa62affected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before cac1405e3ff6685a438e910ad719e0cf06af90eeaffected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before 752a75811f27300fe8131b0a1efc91960f6f88e7affected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before c5d90f9302742985a5078e42ac38de42c364c44aaffected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before 0c3b0e326f838787d229314d4de83af9c53347e8affected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before eb51733ae5fc73d95bd857d5da26f9f65b202a79affected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before 03178cd8f67227015debb700123987fe96275cd1affected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before 4a4ffc1aa9d618e41ad9151f40966e402e58a5a2affected · git
    • dcbeaa68dbbdacbbb330a86c7fc95a28473fc209 and later · before 1e02c641c3a43c88cecc08402000418e15578d38affected · git
Affected versions · NVD (8)

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

  • linux linux kernel2.6.38 and later · before 4.19.325
  • linux linux kernel4.20 and later · before 5.4.287
  • linux linux kernel5.5 and later · before 5.10.231
  • linux linux kernel5.11 and later · before 5.15.174
  • linux linux kernel5.16 and later · before 6.1.120
  • linux linux kernel6.2 and later · before 6.6.64
  • linux linux kernel6.7 and later · before 6.11.11
  • linux linux kernel6.12 and later · before 6.12.2

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.123-16.1.123-1
Debian:13linuxbefore 6.12.3-16.12.3-1

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-2024-53209Dec 27, 2024 · bnxt_en: Fix receive ring space parameters when XDP is active
    22Monitor
  • ← EarlierCVE-2024-53216Dec 27, 2024 · nfsd: release svc_expkey/svc_export with rcu_work
    31Monitor
  • Later →CVE-2024-53219Dec 27, 2024 · virtiofs: use pages instead of pointer for kernel direct IO
    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 Linux03178cd8f67227015debb700123987fe96275cd1Vendor (CNA)
Linux Linux0c3b0e326f838787d229314d4de83af9c53347e8Vendor (CNA)
Linux Linux1e02c641c3a43c88cecc08402000418e15578d38Vendor (CNA)
Linux Linux4a4ffc1aa9d618e41ad9151f40966e402e58a5a2Vendor (CNA)
Linux Linux752a75811f27300fe8131b0a1efc91960f6f88e7Vendor (CNA)
Linux Linuxc5d90f9302742985a5078e42ac38de42c364c44aVendor (CNA)
Linux Linuxcac1405e3ff6685a438e910ad719e0cf06af90eeVendor (CNA)
Linux Linuxd9a0d1f6e15859ea7a86a327f28491e23deaaa62Vendor (CNA)
Linux Linuxeb51733ae5fc73d95bd857d5da26f9f65b202a79Vendor (CNA)
cbl2 kernel 5.15.173.1-2 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.173.1-2 on CBL-Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.176.3-1 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.123-1 · Debian:12Package 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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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-476 · NULL Pointer Dereference

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.

References

Show all references (12 more)

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

All records