CVE-2026-43089: Linux vulnerability

CVE-2026-43089: xfrm_user: fix info leak in build_mapping()

In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

UnknownCVSS not scoredNot KEV-listedUpdatedOct 15, 2026, 01:19 UTC (UTC+00:00)

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2026-43089 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 6, 2026, 07:40 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

3Timeline events

1ADP providers

12Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
May 1, 2026, 14:12 UTC (UTC+00:00)
CVE publishedCVE Program
The CVE record was published.
May 6, 2026, 07:40 UTC (UTC+00:00)
CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Oct 15, 2026, 01:19 UTC (UTC+00:00)

ADP provider summaries

Source materials

CVE List V5 sourceCVE List V5
https://git.kernel.org/stable/c/521385cbd50ca9474396d88462fcdfa6489685d9CVE reference, Linux
https://git.kernel.org/stable/c/c2779ae9a3e5a044e5ccd564681511bbbcc5fc0fCVE reference, Linux
https://git.kernel.org/stable/c/72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32CVE reference, Linux
https://git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24dCVE reference, Linux
https://git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2CVE reference, Linux
https://git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0cCVE reference, Linux
https://git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10CVE reference, Linux
https://git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02CVE reference, Linux
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlCVE reference, siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlCVE reference, siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-784472.htmlCVE reference, siemens-SADP

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

LinuxLinux3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4unaffected

LinuxLinux2.6.29, 0, 5.10.258, 5.15.209, 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0affected

Weakness

CWE details

No CWE listed

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