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CVE-2006-5173

Status: ModifiedLow (2.1)—

Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Canonical — Ubuntu LinuxLinux — Linux Kernel

CWEs

References

Raw JSON (NVD)

Show
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  "id": "CVE-2006-5173",
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          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
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        "obtainUserPrivilege": false,
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  "published": "2006-10-17T22:07:00.000",
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      "lang": "en",
      "value": "Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access."
    },
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    }
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  "lastModified": "2026-06-16T22:30:38.563",
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    {
      "comment": "Not Vulnerable.  This flaw only affects kernel versions 2.6.14 to 2.6.18.  Red Hat Enterprise Linux 2.1, 3, and 4 does not ship with a vulnerable kernel version.",
      "lastModified": "2006-11-03T00:00:00",
      "organization": "Red Hat"
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}