Description
OpenAFS 1.x before 1.6.22 does not properly validate Rx ack packets, which allows remote attackers to cause a denial of service (system crash or application crash) via crafted fields, as demonstrated by an integer underflow and assertion failure for a small MTU value.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | openafs | 1.6.22-1 | — |
| Debian 12 | openafs | 1.6.22-1 | — |
| Debian 9 | openafs | 1.6.20-2+deb9u1 | DSA-4067-1 |
| Debian 8 | openafs | 1.6.9-2+deb8u6 | DSA-4067-1 |
| Debian 7 | openafs | 1.6.1-3+deb7u8 | DLA-1213-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | openafs | No fix yet | — |
Advisories 2
- DSA-4067-1 openafs - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1213-1 openafs - security update Debian Security (DSA / DLA) · Mar 9, 2026