Polkit: regression in cve-2026-4897 fix (polkit read_cookie()) - stack buffer underflow
Historical advisory recorded 6 Nov 2026 21:03:03 UTC. Read the latest advisory.
cve-program · CVE-2026-85498
PublishedA 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).
Read the publisher's advisoryAffected versions, risk and source history
cve-program · CVE-2026-85498
PublishedPolkit: regression in cve-2026-4897 fix (polkit read_cookie()) - stack buffer underflow
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).
- Source published
- 29 Oct 2026 09:02:35 UTC
- Source modified
- 6 Nov 2026 19:46:43 UTC
- Saved here
- 6 Nov 2026 21:03:03 UTC
- Source terms
- CVE Program Terms of Use
Original source record · Cite this exact observation · Complete original publisher JSON
Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS 3.1 · 3.5 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L