popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• debian debian linux8.0
• gnu bashbefore 4.4
• gnu bash4.4
• redhat enterprise linux desktop6.0
• redhat enterprise linux desktop7.0
• redhat enterprise linux server6.0
• redhat enterprise linux server7.0
• redhat enterprise linux server aus7.4
• redhat enterprise linux server aus7.6
• redhat enterprise linux server aus7.7
• redhat enterprise linux server eus7.4
• redhat enterprise linux server eus7.5
• redhat enterprise linux server eus7.6
• redhat enterprise linux server eus7.7
• redhat enterprise linux server tus7.6
• redhat enterprise linux server tus7.7
• redhat enterprise linux workstation6.0
• redhat enterprise linux workstation7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2014-7169GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed function definitions in the values of environment variablKEV
  99Now
• CVE-2014-6271GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attacKEV
  99Now
• CVE-2014-6278GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attKEV
  95Now
• CVE-2014-7186The redirection implementation in parse.y in GNU Bash through 4.3 bash43-026 allows remote attackers to cause a denial of service (out-of-bo
  61This week
• CVE-2014-6277GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote att
  61This week
• CVE-2014-7187Off-by-one error in the read_token_word function in parse.y in GNU Bash through 4.3 bash43-026 allows remote attackers to cause a denial of
  59Plan

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.