Description
scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.
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 | x11vnc | 0.9.16-5 | — |
| Debian 13 | x11vnc | 0.9.16-5 | — |
| Debian 12 | x11vnc | 0.9.16-5 | — |
| Debian 10 | x11vnc | 0.9.13-6+deb10u1 | DSA-4799-1 |
| Debian 9 | x11vnc | 0.9.13-2+deb9u2 | DLA-2490-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | x11vnc | 0.9.16-3ubuntu0.1~esm2 | USN-9089-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | veyon | 4.6.0-1.1 | openSUSE-SU-2024:11496-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.23 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.22 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.21 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.20 | x11vnc | 0.9.16-r2 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.18 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.17 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.16 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.15 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.14 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.13 | x11vnc | 0.9.16-r2 | — |
| Alpine v3.12 | x11vnc | 0.9.16-r1 | — |
Advisories 4
- USN-9089-1 x11vnc vulnerability Ubuntu Security Notices (USN) · Nov 13, 2026
- DSA-4799-1 x11vnc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2490-1 x11vnc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11496-1 veyon-4.6.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- https://github.com/LibVNC/x11vnc/commit/69eeb9f7baa14ca03b16c9de821f9876def7a36a
- DSA-4799 vendor-advisory
- [debian-lts-announce] 20201210 [SECURITY] [DLA 2490-1] x11vnc security update mailing-list
- FEDORA-2021-c5b679877e vendor-advisory
- FEDORA-2021-93911302d6 vendor-advisory
- FEDORA-2021-069c0c3950 vendor-advisory