Trending
CVE-2026-31518

CVE detail

CVE-2026-31518

In the Linux kernel, the following vulnerability has been resolved: esp: fix skb leak with espintcp and async crypto When the TX queue for espintcp is full, esp_output_tail_tcp will return an error and not free the skb, because with synchronous crypto, the common xfrm output code will drop the packet for us. With async crypto (esp_output_done), we need to drop the skb when esp_output_tail_tcp returns an error.

CVSS 5.5 · MediumBuzz score 45.6

Buzz score

Why this CVE is surfacing

Buzz score total 45.6

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 25.6 · diversity 20.0 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

25.6

12 evidence mentions in the snapshot

Diversity score

20.0

4 sources across 4 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 1; within the 30d window
Peak daily: 1; highest bucket

Evidence

Source links by recency

Newest mentions first

12 source links · newest first

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFPCISA Alerts
00 CPU 1518(F)-4 PN/DP MFP are affected: SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) vers:intdot/>=3.1.6 (CVE-2021-41617, CVE-2023-28531, CVE-2023-51384, CVE-2023-52927, CVE-2024-26783, CVE-2024-27056, CVE-2024-28956, CVE-2024-36903, CVE-2024-36927, CVE-2024-42079, CVE-2024-46786, CVE-2024-47736, CVE-2024-47809, CVE-2024-49968, CVE-2024-4
governmentwww.cisa.govJul 28, 2026, 12:00 PM
CVE-2026-31518 esp: fix skb leak with espintcp and async cryptoMicrosoft MSRC
Information published.
vendormsrc.microsoft.comApr 30, 2026, 8:09 AM
https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comApr 22, 2026, 2:16 PM
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/df6f995358dc1f3c42484f5cfe241d7bd3e1cd15git.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/aca3ad0c262f54a5b5c95dda80a48365997d1224git.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/88d386243ed374ac969dabd3bbc1409a31d81818git.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/6aa9841d917532d0f2d932d1ff2f3a94305aaf47git.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/6a3ec6efbc4f90e0ccb2e71574f07351f19996f4git.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/4820847e036ff1035b01b69ad68dfc17e7028fe9git.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/41aafca57de4a4c026701622bd4648f112a9edcdgit.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM
https://git.kernel.org/stable/c/0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2git.kernel.org
No excerpt available.
Exploitgit.kernel.orgApr 22, 2026, 2:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

Related records

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External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-31518.

Product-level CPE searches intentionally omit version fields and NVD version-range or configuration certainty. Verify the exact product version and configuration independently.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:o:linux:linux_kernelSearch this product on Shodan

Exact CVE query

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vuln:CVE-2026-31518Search this CVE on Shodan

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Metadata

Canonical fields

NVD status

Modified

Published

Apr 22, 2026

Modified

Jul 14, 2026

Official record

Authoritative NVD record

CVSS vector

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

CWE IDs

Vendor classifications

How this vector reads

CVSS 3.1 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Local. The attacker needs local access to the vulnerable system.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Privileges Required (PR): Low. The attacker needs basic user-level privileges.
User Interaction (UI): None. Exploitation does not require another user to act.
Scope (S): Unchanged. Impacts remain within the vulnerable security authority.
Confidentiality Impact (C): None. There is no direct impact to this security property.
Integrity Impact (I): None. There is no direct impact to this security property.
Availability Impact (A): High. There is a total or serious impact to this security property.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses