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NVD / CVE Program· CNA Linux

CVE-2024-26826: mptcp: fix data re-injection from stale subflow

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: 0.65% (FIRST EPSS); higher than 51.6% 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 624902eab7abcb8731b333ec73f206d38d839cd8, 6673d9f1c2cd984390550dbdf7d5ae07b20abbf8, 6f95120f898b40d13fd441225ef511307853c9c2.
  • Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 624902eab7abcb8731b333ec73f206d38d839cd8, 6673d9f1c2cd984390550dbdf7d5ae07b20abbf8, 6f95120f898b40d13fd441225ef511307853c9c2 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 data re-injection from stale subflow When the MPTCP PM detects that a subflow is stale, all the packet scheduler must re-inject all the mptcp-level unacked data. To avoid acquiring unneeded locks, it first try to check if any unacked data is present at all in the RTX queue, but such check is currently broken, as it uses TCP-specific helper on an MPTCP socket. Funnily enough fuzzers and static checkers are happy, as the accessed memory still belongs to the mptcp_sock struct, and even from a functional perspective the recovery completed successfully, as the short-cut test always failed. A recent unrelated TCP change - commit d5fed5addb2b ("tcp: reorganize tcp_sock fast path variables") - exposed the issue, as the tcp field reorganization makes the mptcp code always skip the re-inection. Fix the issue dropping the bogus call: we are on a slow path, the early optimization proved once again to be evil.

Published
Apr 17, 2024
Updated
Aug 5, 2026
EPSS
0.6% · 51th 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 · 0.6%

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

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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

    • 5.15affected
    • 1e1d9d6f119c55c05e8ea78ed3e49046690abffd and later · before 6f95120f898b40d13fd441225ef511307853c9c2affected · git
    • 1e1d9d6f119c55c05e8ea78ed3e49046690abffd and later · before 6673d9f1c2cd984390550dbdf7d5ae07b20abbf8affected · git
    • 1e1d9d6f119c55c05e8ea78ed3e49046690abffd and later · before b609c783c535493aa3fca22c7e40a120370b1ca5affected · git
    • 1e1d9d6f119c55c05e8ea78ed3e49046690abffd and later · before 624902eab7abcb8731b333ec73f206d38d839cd8affected · git
    • 1e1d9d6f119c55c05e8ea78ed3e49046690abffd and later · before b6c620dc43ccb4e802894e54b651cf81495e9598affected · git
    • before 5.15not affected · semver
    • 5.15.149 and later · up to and including 5.15.*not affected · semver
    • 6.1.79 and later · up to and including 6.1.*not affected · semver
    • 6.6.18 and later · up to and including 6.6.*not affected · semver
Affected versions · NVD (5)

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

  • linux linux kernel5.15 and later · before 5.15.149
  • linux linux kernel5.16 and later · before 6.1.79
  • linux linux kernel6.2 and later · before 6.6.18
  • linux linux kernel6.7 and later · before 6.7.6
  • linux linux kernel6.8

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9bpftoolbefore 7.3.0-427.42.1.el9_47.3.0-427.42.1.el9_4
AlmaLinux:9kernelbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64kbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debugbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-develbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-cross-headersbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debugbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-develbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4

+96

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-2024-26824Apr 17, 2024 · crypto: algif_hash - Remove bogus SGL free on zero-length error path
    22Monitor
  • ← EarlierCVE-2024-26825Apr 17, 2024 · nfc: nci: free rx_data_reassembly skb on NCI device cleanup
    22Monitor
  • Later →CVE-2024-26829Apr 17, 2024 · media: ir_toy: fix a memleak in irtoy_tx
    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 Linux624902eab7abcb8731b333ec73f206d38d839cd8Vendor (CNA)
Linux Linux6673d9f1c2cd984390550dbdf7d5ae07b20abbf8Vendor (CNA)
Linux Linux6f95120f898b40d13fd441225ef511307853c9c2Vendor (CNA)
Linux Linuxb609c783c535493aa3fca22c7e40a120370b1ca5Vendor (CNA)
Linux Linuxb6c620dc43ccb4e802894e54b651cf81495e9598Vendor (CNA)
almalinux:bpftool4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:bpftool7.3.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-553.8.1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)

+34

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)

—

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 (4 more)

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

All records