Polkit: regression in cve-2026-4897 fix (polkit read_cookie()) - stack buffer underflow
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
Polkit, a system authorization framework commonly used on Linux and other Unix-like systems, is affected by this flaw in its authentication agent helper. An attacker who can supply specially crafted input can trigger an out-of-bounds memory read that may crash the application, causing a denial of service.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A flaw was found in polkit. When processing input that begins with a null byte, an arithmetic error in the authentication agent helper causes an integer underflow during buffer length calculation, resulting in an out-of-bounds memory read. An attacker capable of supplying crafted input can trigger this flaw, potentially causing an application crash and resulting in a Denial of Service (DoS).
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- polkit-main
Version range not reported
- polkit
Version range not reported
- polkit-pkla-compat
Version range not reported
- polkit
Version range not reported
- polkit-gnome
Version range not reported
- polkit
Version range not reported
- polkit-kde
Version range not reported
- polkit-pkla-compat
Version range not reported
- polkit-qt
Version range not reported
- polkit
Version range not reported
- polkit-pkla-compat
Version range not reported
- polkit
Version range not reported
- polkit-pkla-compat
Version range not reported
- openshift/ose-rhel-coreos-8
Version range not reported
- openshift/ose-rhel-coreos-9
Version range not reported
- openshift/ose-rhel-coreos-9
Version range not reported