CVE-2022-49809

Local service interruption via leaked frame copies

Published May 1, 2025 · Updated May 23, 2026

Memory leak in the X.25 LAPB receive path in Linux allows local users to exhaust kernel memory via undersized or fragmented frames. The x25_lapb_receive_frame() function copies each socket buffer with skb_copy() but fails to free the private copy when validation rejects an undersized or fragmented buffer. Reaching the flaw requires low-privileged local access to feed the X.25 receive path; repeated failures consume kernel memory and can interrupt service without disclosing or modifying data.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the X.25 LAPB receive path in Linux allows local users to exhaust kernel memory via undersized or fragmented frames. The x25_lapb_receive_frame() function copies each socket buffer with skb_copy() but fails to free the private copy when validation rejects an undersized or fragmented buffer. Reaching the flaw requires low-privileged local access to feed the X.25 receive path; repeated failures consume kernel memory and can interrupt service without disclosing or modifying data.

The record

CVE
CVE-2022-49809
Published
May 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=3.0.72 <3.1
  2. Affected versionversion=3.1
  3. Affected versionversion=7f3ea0c12493c9ff38a13a89bcf08846b50c1f1c
  4. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <0ef17d966445358a55c5f4ccf2c73cca3e39192b
  5. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <2929cceb2fcf0ded7182562e4888afafece82cce
  6. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <2d675be16a461310d738d93f9f1a00da62055c5a
  7. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <9f00da9c866d506998bf0a3f699ec900730472da
  8. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <c8baf1fc248b2e88642f094fea9509a9bf98c5bb
  9. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <dfcfbe4f2e4b2c81cff4e79b48502d97fda73118
  10. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <e109b41870db995cae25dfaf0cc3922f9028b1a1
  11. Affected versionversion=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <fda0ba7c84b46d10947c687320804b9de149a921

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.0.72 <3.1; version=3.1; version=7f3ea0c12493c9ff38a13a89bcf08846b50c1f1c; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <0ef17d966445358a55c5f4ccf2c73cca3e39192b; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <2929cceb2fcf0ded7182562e4888afafece82cce; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <2d675be16a461310d738d93f9f1a00da62055c5a; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <9f00da9c866d506998bf0a3f699ec900730472da; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <c8baf1fc248b2e88642f094fea9509a9bf98c5bb; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <dfcfbe4f2e4b2c81cff4e79b48502d97fda73118; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <e109b41870db995cae25dfaf0cc3922f9028b1a1; version=cb101ed2c3c7c0224d16953fe77bfb9d6c2cb9df <fda0ba7c84b46d10947c687320804b9de149a921

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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)
Vectorlocal
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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