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NVD / CVE Program· CNA Linux

CVE-2023-52574: team: fix null-ptr-deref when team device type is changed

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: 0.25% (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 1779eb51b9cc628cee551f252701a85a2a50a457, 2f0acb0736ecc3eb85dc80ad2790d634dcb10b58, 492032760127251e5540a5716a70996bacf2a3fd.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1779eb51b9cc628cee551f252701a85a2a50a457, 2f0acb0736ecc3eb85dc80ad2790d634dcb10b58, 492032760127251e5540a5716a70996bacf2a3fd 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: team: fix null-ptr-deref when team device type is changed Get a null-ptr-deref bug as follows with reproducer [1]. BUG: kernel NULL pointer dereference, address: 0000000000000228 ... RIP: 0010:vlan_dev_hard_header+0x35/0x140 [8021q] ... Call Trace: <TASK> ? __die+0x24/0x70 ? page_fault_oops+0x82/0x150 ? exc_page_fault+0x69/0x150 ? asm_exc_page_fault+0x26/0x30 ? vlan_dev_hard_header+0x35/0x140 [8021q] ? vlan_dev_hard_header+0x8e/0x140 [8021q] neigh_connected_output+0xb2/0x100 ip6_finish_output2+0x1cb/0x520 ? nf_hook_slow+0x43/0xc0 ? ip6_mtu+0x46/0x80 ip6_finish_output+0x2a/0xb0 mld_sendpack+0x18f/0x250 mld_ifc_work+0x39/0x160 process_one_work+0x1e6/0x3f0 worker_thread+0x4d/0x2f0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe5/0x120 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 [1] $ teamd -t team0 -d -c '{"runner": {"name": "loadbalance"}}' $ ip link add name t-dummy type dummy $ ip link add link t-dummy name t-dummy.100 type vlan id 100 $ ip link add name t-nlmon type nlmon $ ip link set t-nlmon master team0 $ ip link set t-nlmon nomaster $ ip link set t-dummy up $ ip link set team0 up $ ip link set t-dummy.100 down $ ip link set t-dummy.100 master team0 When enslave a vlan device to team device and team device type is changed from non-ether to ether, header_ops of team device is changed to vlan_header_ops. That is incorrect and will trigger null-ptr-deref for vlan->real_dev in vlan_dev_hard_header() because team device is not a vlan device. Cache eth_header_ops in team_setup(), then assign cached header_ops to header_ops of team net device when its type is changed from non-ether to ether to fix the bug.

Published
Mar 2, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 16th 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 · 0.2%

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
7.8
2.3 point gap

CVSS:3.1/AV:L/AC:L/PR:L/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.

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

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When you'll hear from us

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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

    • 3.7affected
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 1779eb51b9cc628cee551f252701a85a2a50a457affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before a7fb47b9711101d2405b0eb1276fb1f9b9b270c7affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before c5f6478686bb45f453031594ae19b6c9723a780daffected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before b44dd92e2afd89eb6e9d27616858e72a67bdc1a7affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before cd05eec2ee0cc396813a32ef675634e403748255affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 2f0acb0736ecc3eb85dc80ad2790d634dcb10b58affected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before cac50d9f5d876be32cb9aa21c74018468900284daffected · git
    • 1d76efe1577b4323609b1bcbfafa8b731eda071a and later · before 492032760127251e5540a5716a70996bacf2a3fdaffected · git
    • before 3.7not affected · semver
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 kernel3.7 and later · before 4.14.327
  • linux linux kernel4.15 and later · before 4.19.296
  • linux linux kernel4.20 and later · before 5.4.258
  • linux linux kernel5.5 and later · before 5.10.198
  • linux linux kernel5.11 and later · before 5.15.134
  • linux linux kernel5.16 and later · before 6.1.56
  • linux linux kernel6.2 and later · before 6.5.6
  • linux linux kernel6.6

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.64-16.1.64-1
Debian:13linuxbefore 6.5.6-16.5.6-1

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-2023-52572Mar 2, 2024 · cifs: Fix UAF in cifs_demultiplex_thread()
    31Monitor
  • ← EarlierCVE-2023-52573Mar 2, 2024 · net: rds: Fix possible NULL-pointer dereference
    22Monitor
  • Later →CVE-2023-52576Mar 2, 2024 · x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer()
    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 Linux1779eb51b9cc628cee551f252701a85a2a50a457Vendor (CNA)
Linux Linux2f0acb0736ecc3eb85dc80ad2790d634dcb10b58Vendor (CNA)
Linux Linux492032760127251e5540a5716a70996bacf2a3fdVendor (CNA)
Linux Linuxa7fb47b9711101d2405b0eb1276fb1f9b9b270c7Vendor (CNA)
Linux Linuxb44dd92e2afd89eb6e9d27616858e72a67bdc1a7Vendor (CNA)
Linux Linuxc5f6478686bb45f453031594ae19b6c9723a780dVendor (CNA)
Linux Linuxcac50d9f5d876be32cb9aa21c74018468900284dVendor (CNA)
Linux Linuxcd05eec2ee0cc396813a32ef675634e403748255Vendor (CNA)
debian:linux6.1.64-1 · 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.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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 (7 more)

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

All records