========================================================================== Ubuntu Security Notice USN-8168-2 April 14, 2026
rustc, rustc-1.76, rustc-1.77, rustc-1.78, rustc-1.79, rustc-1.80
vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
rustc could be made to modify permissions on arbitrary directories.
Software Description:
- rustc: Rust systems programming language
- rustc-1.76: Rust systems programming language
- rustc-1.77: Rust systems programming language
- rustc-1.78: Rust systems programming language
- rustc-1.79: Rust systems programming language
- rustc-1.80: Rust systems programming language
Details:
USN-8168-1 fixed a vulnerability in Rust. This update provides the
corresponding update to Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04
LTS and Ubuntu 20.04 LTS.
Original advisory details:
It was discovered that tar-rs embedded in rustc incorrectly handled
symlinks when unpacking a tar archive. If a user or automated system were
tricked into processing a specially crafted tar archive, a remote attacker
could use this issue to modify permissions of arbitrary directories
outside the extraction root, and possibly escalate privileges.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
rustc 1.75.0+dfsg0ubuntu1~bpo0-0ubuntu0.20.04.1
Available with Ubuntu Pro
rustc-1.76 1.76.0+dfsg0ubuntu1~bpo0-0ubuntu0.20.04.1
Available with Ubuntu Pro
rustc-1.77 1.77.2+dfsg1ubuntu1~bpo0-0ubuntu0.20.04.1
Available with Ubuntu Pro
rustc-1.78 1.78.0+dfsg1ubuntu1~bpo0-0ubuntu0.20.04.1
Available with Ubuntu Pro
rustc-1.79 1.79.0+dfsg1ubuntu1~bpo0-0ubuntu0.20.04.3
Available with Ubuntu Pro
rustc-1.80 1.80.1+dfsg0ubuntu1~bpo0-0ubuntu0.20.04.1
Available with Ubuntu Pro
Ubuntu 18.04 LTS
rustc 1.65.0+dfsg0ubuntu1~llvm2-0ubuntu0.18.04.1
Available with Ubuntu Pro
Ubuntu 16.04 LTS
rustc 1.47.0+dfsg1+llvm-1ubuntu1~16.04.1ubuntu2
Available with Ubuntu Pro
Ubuntu 14.04 LTS
rustc 1.31.0+dfsg1+llvm-2ubuntu1~14.04.1ubuntu1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8168-2
https://ubuntu.com/security/notices/USN-8168-1
CVE-2026-33056
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