VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-93174: Linux kernel · bpf: Copy per-CPU map value padding in copy_map_value_long()

Source GCVE Database

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Authoritative record:CVE-2026-93174· Medium

Not known to be exploited · fixed in ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef : update Linux kernel when convenient.

Data as of 30 Oct 2026, 18:18 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef, e0653c8f718109d140e806daac166c43e2b2b8bd, 953e85da53541a8dc3e7ad4e8532f29a34a32eae +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-2m7j-g554-hf69

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 448325199f574d33824dbf9121efb03558412966, < ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef	Fixed in ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef
LinuxLinux	Affected ≥ 448325199f574d33824dbf9121efb03558412966, < e0653c8f718109d140e806daac166c43e2b2b8bd	Fixed in e0653c8f718109d140e806daac166c43e2b2b8bd
LinuxLinux	Affected ≥ 448325199f574d33824dbf9121efb03558412966, < 953e85da53541a8dc3e7ad4e8532f29a34a32eae	Fixed in 953e85da53541a8dc3e7ad4e8532f29a34a32eae
LinuxLinux	Affected ≥ 448325199f574d33824dbf9121efb03558412966, < 7cf9cd98cf6f0df3befc167ca6b54c07014d71de	Fixed in 7cf9cd98cf6f0df3befc167ca6b54c07014d71de
LinuxLinux	Affected ≥ 448325199f574d33824dbf9121efb03558412966, < 5e9f69829835521aa2942d1d14bd0990fbc6991e	Fixed in 5e9f69829835521aa2942d1d14bd0990fbc6991e
LinuxLinux	Affected ≥ 448325199f574d33824dbf9121efb03558412966, < 003bf840ed3326bd01396ce7d5b431cef0d371e7	Fixed in 003bf840ed3326bd01396ce7d5b431cef0d371e7

AI-suggested

A fix has been implemented in the Linux kernel to pass the rounded-up map value size to the copy function, ensuring all padding bytes are copied and stale data is not leaked. Users should apply the official kernel update containing this fix once available. No additional mitigation steps are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's BPF subsystem involves improper copying of per-CPU map value padding in the copy_map_value_long() function. This flaw can cause stale heap data from padding bytes to be returned to user space during certain UAPI lookup operations and BPF iteration on per-CPU maps. The issue arises because the copy operation uses the unrounded map value size, omitting tail padding bytes that may contain leftover heap data. The vulnerability has been resolved by adjusting the copy to include the full rounded size, ensuring all padding bytes are copied properly.

Impact

This vulnerability can lead to information disclosure where stale heap data from kernel memory padding is unintentionally returned to user space during BPF per-CPU map lookups and iterations. Such leakage could expose sensitive kernel memory contents. There is no indication of active exploitation in the wild. The impact is limited to potential information disclosure via specific BPF map operations.

References

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