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Ubuntu 20.04 Rustc Important Permissions Elevation Vulnerability USN-8168-2

ubuntu
Calendar Grey April 14, 2026
Dist Ubuntu Esm H88
A critical update for rustc addresses permissions issue in Ubuntu versions, affecting security and system integrity.
rustc could be made to modify permissions on arbitrary directories.

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.

Topics%20covered

Topics Covered

security advisory update Ubuntu important permissions rustc

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8168-2

Topics%20covered

Topics Covered

security advisory update Ubuntu important permissions rustc

Package Information

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