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NVD / CVE Program· CNA Linux

CVE-2025-23145: mptcp: fix NULL pointer in can_accept_new_subflow

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: 0.58% (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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 443041deb5ef6a1289a99ed95015ec7442f141dc, 4b2649b9717678aeb097893cc49f59311a1ecab0, 7f9ae060ed64aef8f174c5f1ea513825b1be9af1; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1.
  • Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 443041deb5ef6a1289a99ed95015ec7442f141dc, 4b2649b9717678aeb097893cc49f59311a1ecab0, 7f9ae060ed64aef8f174c5f1ea513825b1be9af1; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1 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: mptcp: fix NULL pointer in can_accept_new_subflow When testing valkey benchmark tool with MPTCP, the kernel panics in 'mptcp_can_accept_new_subflow' because subflow_req->msk is NULL. Call trace: mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P) subflow_syn_recv_sock (./net/mptcp/subflow.c:854) tcp_check_req (./net/ipv4/tcp_minisocks.c:863) tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268) ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207) ip_local_deliver_finish (./net/ipv4/ip_input.c:234) ip_local_deliver (./net/ipv4/ip_input.c:254) ip_rcv_finish (./net/ipv4/ip_input.c:449) ... According to the debug log, the same req received two SYN-ACK in a very short time, very likely because the client retransmits the syn ack due to multiple reasons. Even if the packets are transmitted with a relevant time interval, they can be processed by the server on different CPUs concurrently). The 'subflow_req->msk' ownership is transferred to the subflow the first, and there will be a risk of a null pointer dereference here. This patch fixes this issue by moving the 'subflow_req->msk' under the `own_req == true` conditional. Note that the !msk check in subflow_hmac_valid() can be dropped, because the same check already exists under the own_req mpj branch where the code has been moved to.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2025
Updated
Oct 15, 2026
EPSS
0.5% · 48th 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%

CISA SSVC decision

Exploitation
none
Automatable
yes
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

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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
debiandebian linux

Affected versions

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

  • debian debian linux11.0
  • linux linux kernel5.11 and later · before 5.15.181
  • linux linux kernel5.16 and later · before 6.1.135
  • linux linux kernel6.2 and later · before 6.6.88
  • linux linux kernel5.9 and later · before 5.10.237
  • linux linux kernel6.13 and later · before 6.13.12
  • linux linux kernel6.14 and later · before 6.14.3
  • linux linux kernel6.7 and later · before 6.12.24

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

    • 5.9affected
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before 8cf7fef1bb2ffea7792bcbf71ca00216cecc725daffected · git
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before b3088bd2a6790c8efff139d86d7a9d0b1305977baffected · git
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before 855bf0aacd51fced11ea9aa0d5101ee0febaeadbaffected · git
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before 7f9ae060ed64aef8f174c5f1ea513825b1be9af1affected · git
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before dc81e41a307df523072186b241fa8244fecd7803affected · git
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before efd58a8dd9e7a709a90ee486a4247c923d27296faffected · git
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before 4b2649b9717678aeb097893cc49f59311a1ecab0affected · git
    • 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 and later · before 443041deb5ef6a1289a99ed95015ec7442f141dcaffected · git
    • before 5.9not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.135-16.1.135-1
Debian:13linuxbefore 6.12.25-16.12.25-1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_33before 18-150400.2.118-150400.2.1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_34before 17-150400.2.117-150400.2.1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_36before 11-150400.2.111-150400.2.1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_37before 11-150400.2.111-150400.2.1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_39before 10-150400.2.110-150400.2.1
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_21before 15-150500.2.115-150500.2.1
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_23before 11-150500.2.111-150500.2.1
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_25before 10-150500.2.110-150500.2.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_10before 10-150600.2.110-150600.2.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_6before 16-150600.2.116-150600.2.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_7before 16-150600.2.116-150600.2.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_10before 10-150600.2.110-150600.2.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_5before 19-150600.2.119-150600.2.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_7before 16-150600.2.116-150600.2.1
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_9before 11-150600.2.111-150600.2.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_0before 8-150700.3.21.28-150700.3.21.2
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7-RT_Update_0before 8-150700.3.18-150700.3.1
SUSE:Linux Micro 6.0kernel-livepatch-MICRO-6-0_Update_3before 16-1.216-1.2
SUSE:Linux Micro 6.0kernel-livepatch-MICRO-6-0_Update_4before 14-1.214-1.2
SUSE:Linux Micro 6.0kernel-livepatch-MICRO-6-0_Update_5before 12-1.212-1.2
SUSE:Linux Micro 6.0kernel-livepatch-MICRO-6-0_Update_6before 10-3.110-3.1
SUSE:Linux Micro 6.0kernel-livepatch-MICRO-6-0-RT_Update_3before 16-1.216-1.2

+4

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-2025-23143May 1, 2025 · net: Fix null-ptr-deref by sock_lock_init_class_and_name() and rmmod.
    22Monitor
  • ← EarlierCVE-2025-23144May 1, 2025 · backlight: led_bl: Hold led_access lock when calling led_sysfs_disable()
    22Monitor
  • Later →CVE-2025-23147May 1, 2025 · i3c: Add NULL pointer check in i3c_master_queue_ibi()
    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 Linux443041deb5ef6a1289a99ed95015ec7442f141dcVendor (CNA)
Linux Linux4b2649b9717678aeb097893cc49f59311a1ecab0Vendor (CNA)
Linux Linux7f9ae060ed64aef8f174c5f1ea513825b1be9af1Vendor (CNA)
Linux Linux855bf0aacd51fced11ea9aa0d5101ee0febaeadbVendor (CNA)
Linux Linux8cf7fef1bb2ffea7792bcbf71ca00216cecc725dVendor (CNA)
Linux Linuxb3088bd2a6790c8efff139d86d7a9d0b1305977bVendor (CNA)
Linux Linuxdc81e41a307df523072186b241fa8244fecd7803Vendor (CNA)
Linux Linuxefd58a8dd9e7a709a90ee486a4247c923d27296fVendor (CNA)
azl3 kernel 6.6.85.1-4 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.92.2-1 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.135-1 · Debian:12Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_316-1.2 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_414-1.2 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_512-1.2 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0_Update_610-3.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0-RT_Update_316-1.2 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0-RT_Update_413-1.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0-RT_Update_512-1.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0-RT_Update_610-3.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-MICRO-6-0-RT_Update_710-1.3 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6-RT_Update_519-150600.2.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6-RT_Update_716-150600.2.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6-RT_Update_911-150600.2.1 · SUSE:Linux Enterprise Live Patching 15 SP6Package 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.

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)

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.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (9 more)

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

All records