Timing Attack Affecting linux-pam/linux-pam package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-LINUXPAMLINUXPAM-17660938
- published28 Jun 2026
- disclosed14 Jun 2026
- creditUnknown
Introduced: 14 Jun 2026
CVE-2026-54411 (opens in a new tab)How to fix?
There is no fixed version for linux-pam/linux-pam.
Overview
Affected versions of this package are vulnerable to Timing Attack via the pam_userdb process when credentials are stored and compared in plaintext. An attacker can recover plaintext passwords by repeatedly attempting authentication and measuring response-timing differences. This is only exploitable if the module is explicitly configured to store and compare credentials in plaintext, such as by setting crypt=none, using an unrecognized crypt method, or omitting the crypt= argument.
Workaround
This vulnerability can be mitigated by configuring the module to use a strong cryptographic hashing method or disabling it if not required. Avoid using crypt=none or omitting the crypt= argument in the configuration.