CVE-2025-39948Network attack vector

Service interruption via receive-page leak

Published Oct 4, 2025 · Updated Oct 4, 2025

A receive-buffer memory leak in affected Linux kernels allows remote attackers to exhaust kernel memory with multi-buffer network frames. ice_put_rx_mbuf() counts recorded fragments rather than every descriptor, so it skips zero-length descriptors and never releases their receive pages. Only systems using the ice driver with multi-buffer frames are exposed; 9K MTU jumbo traffic makes the condition recur and can interrupt service.

CVSS severity6.4
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A receive-buffer memory leak in affected Linux kernels allows remote attackers to exhaust kernel memory with multi-buffer network frames. ice_put_rx_mbuf() counts recorded fragments rather than every descriptor, so it skips zero-length descriptors and never releases their receive pages. Only systems using the ice driver with multi-buffer frames are exposed; 9K MTU jumbo traffic makes the condition recur and can interrupt service.

The record

CVE
CVE-2025-39948
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=311813ed013c016d4b0b0985a9ee41f778489077 <80555adb5c892f0e21d243ae96ed997ee520aea9
  2. Affected versionversion=6.14
  3. Affected versionversion=743bbd93cf29f653fae0e1416a31f03231689911 <84bf1ac85af84d354c7a2fdbdc0d4efc8aaec34b
  4. Affected versionversion=743bbd93cf29f653fae0e1416a31f03231689911 <fcb5718ebfe7fd64144e3399280440cce361a3ae
  5. Affected versionversion=ac1728cf370bec2e74fe6a2adf05b4629980d2b3
  6. Affected versionversion=d445b59d30415bb56f4803f622d566bca06e0abc

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=311813ed013c016d4b0b0985a9ee41f778489077 <80555adb5c892f0e21d243ae96ed997ee520aea9; version=6.14; version=743bbd93cf29f653fae0e1416a31f03231689911 <84bf1ac85af84d354c7a2fdbdc0d4efc8aaec34b; version=743bbd93cf29f653fae0e1416a31f03231689911 <fcb5718ebfe7fd64144e3399280440cce361a3ae; version=ac1728cf370bec2e74fe6a2adf05b4629980d2b3; version=d445b59d30415bb56f4803f622d566bca06e0abc

Published CVSS scores

6.4OracleCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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