CVE-2026-90049

Local memory corruption via premature zerocopy completion

Published Sep 16, 2026 · Updated Sep 16, 2026

Memory corruption in Linux skb_zerocopy allows attackers to overwrite packet fragments during Open vSwitch forwarding. On skb_orphan_frags failure, skb_zerocopy calls skb_tx_error on a source buffer it does not own, prematurely completes its zerocopy argument, and clears the shared-fragment ownership marker. Reachability requires an Open vSwitch userspace action whose failed upcall is followed by continued forwarding and local ESP delivery, which then decrypts in place over non-private fragments.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Memory corruption in Linux skb_zerocopy allows attackers to overwrite packet fragments during Open vSwitch forwarding. On skb_orphan_frags failure, skb_zerocopy calls skb_tx_error on a source buffer it does not own, prematurely completes its zerocopy argument, and clears the shared-fragment ownership marker. Reachability requires an Open vSwitch userspace action whose failed upcall is followed by continued forwarding and local ESP delivery, which then decrypts in place over non-private fragments.

The record

CVE
CVE-2026-90049
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record 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=1674b4bf3eea3cac51b70778e89f8025f7cfe695
  2. Affected versionversion=3.10.51 <3.11
  3. Affected versionversion=3.12.40 <3.13
  4. Affected versionversion=3.14
  5. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <04dd250a78e268af3e7124beb1dc10ec1dd88d60
  6. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <767ec2a65cc022d303b0c9c12811e7db22057341
  7. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <8069643ae64dfdf634b6c78c7f622e5323031436
  8. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <849bdb83123760a865bcb2970127f4c0b9423ba3
  9. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <8ece906150128d5ec2462aabcc978c568433eca4
  10. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <a13b1e80e5015cd732440b475c0ef443dc4a2157
  11. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <bab5a851e44a3601d31f2aa8043f385bb50ac5d9
  12. Affected versionversion=36d5fe6a000790f56039afe26834265db0a3ad4c <fb10e0e9b220a2eed08931a60dbaad9a2370c908
  13. Affected versionversion=c5f0c0e7525443add533495e93ba8de6feab2396

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1674b4bf3eea3cac51b70778e89f8025f7cfe695; version=3.10.51 <3.11; version=3.12.40 <3.13; version=3.14; version=36d5fe6a000790f56039afe26834265db0a3ad4c <04dd250a78e268af3e7124beb1dc10ec1dd88d60; version=36d5fe6a000790f56039afe26834265db0a3ad4c <767ec2a65cc022d303b0c9c12811e7db22057341; version=36d5fe6a000790f56039afe26834265db0a3ad4c <8069643ae64dfdf634b6c78c7f622e5323031436; version=36d5fe6a000790f56039afe26834265db0a3ad4c <849bdb83123760a865bcb2970127f4c0b9423ba3; version=36d5fe6a000790f56039afe26834265db0a3ad4c <8ece906150128d5ec2462aabcc978c568433eca4; version=36d5fe6a000790f56039afe26834265db0a3ad4c <a13b1e80e5015cd732440b475c0ef443dc4a2157; version=36d5fe6a000790f56039afe26834265db0a3ad4c <bab5a851e44a3601d31f2aa8043f385bb50ac5d9; version=36d5fe6a000790f56039afe26834265db0a3ad4c <fb10e0e9b220a2eed08931a60dbaad9a2370c908; version=c5f0c0e7525443add533495e93ba8de6feab2396

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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