CVE-2022-48956

Local privilege escalation via IPv6 destination use-after-free

Published Oct 21, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux IPv6 transmit path allows local users to execute kernel code through crafted UDP socket writes. ip6_fragment dereferences a freed rt6_info destination object because UDP callers do not always hold the assumed RCU read lock while fragmentation proceeds. An unprivileged local user can trigger the fraglist path with UDP corking or MSG_MORE, gaining kernel-memory disclosure or writes or causing a kernel panic.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux IPv6 transmit path allows local users to execute kernel code through crafted UDP socket writes. ip6_fragment dereferences a freed rt6_info destination object because UDP callers do not always hold the assumed RCU read lock while fragmentation proceeds. An unprivileged local user can trigger the fraglist path with UDP corking or MSG_MORE, gaining kernel-memory disclosure or writes or causing a kernel panic.

The record

CVE
CVE-2022-48956
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=1758fd4688eb92c796e75bdb1d256dc558ef9581 <6b6d3be3661bff2746cab26147bd629aa034e094
  2. Affected versionversion=1758fd4688eb92c796e75bdb1d256dc558ef9581 <7390c70bd431cbfa6951477e2c80a301643e284b
  3. Affected versionversion=1758fd4688eb92c796e75bdb1d256dc558ef9581 <7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9
  4. Affected versionversion=1758fd4688eb92c796e75bdb1d256dc558ef9581 <803e84867de59a1e5d126666d25eb4860cfd2ebe
  5. Affected versionversion=1758fd4688eb92c796e75bdb1d256dc558ef9581 <8208d7e56b1e579320b9ff3712739ad2e63e1f86
  6. Affected versionversion=1758fd4688eb92c796e75bdb1d256dc558ef9581 <9b1a468a455d8319041528778d0e684a4c062792
  7. Affected versionversion=1758fd4688eb92c796e75bdb1d256dc558ef9581 <b3d7ff8c04a83279fb7641fc4d5aa82a602df7c0
  8. Affected versionversion=4.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1758fd4688eb92c796e75bdb1d256dc558ef9581 <6b6d3be3661bff2746cab26147bd629aa034e094; version=1758fd4688eb92c796e75bdb1d256dc558ef9581 <7390c70bd431cbfa6951477e2c80a301643e284b; version=1758fd4688eb92c796e75bdb1d256dc558ef9581 <7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9; version=1758fd4688eb92c796e75bdb1d256dc558ef9581 <803e84867de59a1e5d126666d25eb4860cfd2ebe; version=1758fd4688eb92c796e75bdb1d256dc558ef9581 <8208d7e56b1e579320b9ff3712739ad2e63e1f86; version=1758fd4688eb92c796e75bdb1d256dc558ef9581 <9b1a468a455d8319041528778d0e684a4c062792; version=1758fd4688eb92c796e75bdb1d256dc558ef9581 <b3d7ff8c04a83279fb7641fc4d5aa82a602df7c0; version=4.13

Published CVSS scores

7.8Linux Kernel Security TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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