GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write.
When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout.
This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade coreutilsUpgrade coreutils-singleUpgrade coreutils-common | Oct 11, 2026 | Sep 10, 2026 |
| Redhat_linux | — | Upgrade coreutils-commonUpgrade coreutils-debugsourceNo solution existsUpgrade coreutils-debuginfoUpgrade coreutilsUpgrade coreutils-singleUpgrade coreutils-single-debuginfo | Jul 27, 2026 | Jul 24, 2026 |
| Rocky_linux | — | Upgrade coreutilsUpgrade coreutils-debugsourceUpgrade coreutils-single-debuginfoUpgrade coreutils-singleUpgrade coreutils-debuginfoUpgrade coreutils-common | Sep 15, 2026 | Sep 11, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 13, 2026 | Jul 24, 2026 |
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