Description
An issue was discovered in klibc before 2.0.9. An integer overflow in the cpio command may result in a NULL pointer dereference on 64-bit systems.
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 14 | klibc | 2.0.8-6 | — |
| Debian 13 | klibc | 2.0.8-6 | — |
| Debian 12 | klibc | 2.0.8-6 | — |
| Debian 9 | klibc | 2.0.4-9+deb9u1 | DLA-2695-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | klibc | 2.0.7-1ubuntu5.1 | USN-5379-1 |
| Ubuntu 18.04 LTS | klibc | 2.0.4-9ubuntu2.1 | USN-5379-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | klibc | 2.0.4-8ubuntu1.16.04.4+esm1 | USN-5379-1 |
| Ubuntu Pro 14.04 LTS | klibc | 2.0.3-0ubuntu1.14.04.3+esm2 | USN-5379-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | klibc | 2.0.9-r0 | — |
| Alpine v3.23 | klibc | 2.0.9-r0 | — |
| Alpine v3.22 | klibc | 2.0.9-r0 | — |
| Alpine v3.21 | klibc | 2.0.9-r0 | — |
| Alpine v3.20 | klibc | 2.0.9-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | klibc | 2.0.9-r0 | — |
Advisories 2
- USN-5379-1 klibc vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- DLA-2695-1 klibc - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://kernel.org/pub/linux/libs/klibc/2.0/
- https://lists.zytor.com/archives/klibc/2021-April/004593.html
- https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=2e48a12ab1e30d43498c2d53e878a11a1b5102d5
- [oss-security] 20210430 [ANNOUNCE] klibc 2.0.9 mailing-list
- [debian-lts-announce] 20210628 [SECURITY] [DLA 2695-1] klibc security update mailing-list