| Name | CVE-2026-85498 |
| 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). |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1149960 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| policykit-1 (PTS) | bookworm | 122-3 | fixed |
| trixie | 126-2 | fixed | |
| forky, sid | 128-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| policykit-1 | source | bookworm | (not affected) | |||
| policykit-1 | source | trixie | (not affected) | |||
| policykit-1 | source | (unstable) | 128-1 | 1149960 |
[trixie] - policykit-1 <not-affected> (Fix for CVE-2026-4897 not applied)
[bookworm] - policykit-1 <not-affected> (Fix for CVE-2026-4897 not applied)
https://github.com/polkit-org/polkit/pull/702
Introduced with: https://github.com/polkit-org/polkit/commit/7e122c8a5120c2aae2d9d44a26796dc18f5b677c
The fix for CVE-2026-4897 introduces th new stack buffer underflow issue.
Fixed by: https://github.com/polkit-org/polkit/commit/eea172967848bb4c5a407329f40c0e45de0d187e (128)