Description
Use-after-free vulnerability in VFS in Google gVisor prior to release 20260831.0 on all platforms allows a local attacker with standard container privileges to achieve code execution in the host sentry process by double-freeing the backing MemoryFile from an in-sandbox overlay filesystem. The sentry process remains confined by host-level Linux seccomp and namespace boundaries.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| gVisor | < 20260831.0 | 20260831.0 |
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 | golang-gvisor-gvisor | 0.0~20261026.0-1 | — |
| Debian 13 | golang-gvisor-gvisor | No fix yet | — |
| Debian 12 | golang-gvisor-gvisor | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | golang-gvisor-gvisor | No fix yet | — |
| Ubuntu 26.04 LTS | golang-gvisor-gvisor | No fix yet | — |
| Ubuntu 24.04 LTS | golang-gvisor-gvisor | No fix yet | — |