CVE-2022-49304

Local service hang via serial-driver lock inversion

Published Feb 26, 2025 · Updated May 11, 2026

Improper locking in the Linux kernel's SA1100 serial driver allows local users to hang the system by changing serial-port settings. The sa1100_set_termios() path holds sport->port.lock while calling del_timer_sync(), whose sa1100_timeout() timer handler waits for the same lock, creating a circular wait. Access to an SA1100 serial port is required; the resulting deadlock blocks the termios operation indefinitely and interrupts system availability.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel's SA1100 serial driver allows local users to hang the system by changing serial-port settings. The sa1100_set_termios() path holds sport->port.lock while calling del_timer_sync(), whose sa1100_timeout() timer handler waits for the same lock, creating a circular wait. Access to an SA1100 serial port is required; the resulting deadlock blocks the termios operation indefinitely and interrupts system availability.

The record

CVE
CVE-2022-49304
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0976808d0d171ec837d4bd3e9f4ad4a00ab703b8
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <09a5958a2452ad22d0cb638711ef34ea1863a829
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2cbfc38df580bff5b2fe19f21c1a7520efcc4b3b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34d91e555e5582cffdbcbb75517bc9217866823e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <553213432ef0c295becdc08c0207d2094468f673
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62b2caef400c1738b6d22f636c628d9f85cd4c4c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e2273eefab54a521d9c59efb6e1114e742bdf41
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <85e20f8bd31a46d8c60103d0274a8ebe8f47f2b2
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <920f0ae7a129ffee98a106e3bbdfd61a2a59e939
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0976808d0d171ec837d4bd3e9f4ad4a00ab703b8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <09a5958a2452ad22d0cb638711ef34ea1863a829; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2cbfc38df580bff5b2fe19f21c1a7520efcc4b3b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34d91e555e5582cffdbcbb75517bc9217866823e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <553213432ef0c295becdc08c0207d2094468f673; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62b2caef400c1738b6d22f636c628d9f85cd4c4c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e2273eefab54a521d9c59efb6e1114e742bdf41; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <85e20f8bd31a46d8c60103d0274a8ebe8f47f2b2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <920f0ae7a129ffee98a106e3bbdfd61a2a59e939; version=2.6.12

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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-667Improper Locking
T1499Endpoint Denial of Service

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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