# CVE-2021-47040: linux: In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffer... CVE-2021-47040 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47040, released February 28, 2024. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2021-47040 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0026 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Feb 28, 2024 ## Description In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffers Colin reported before possible overflow and sign extension problems in io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing useful, see d81269fecb8ce ("io_uring: fix provide_buffers sign extension"). Do that with help of check__overflow helpers. And fix struct io_provide_buf::len type, as it doesn't make much sense to keep it signed. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47040](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47040.md) | Feb 28, 2024 | | Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47040](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47040.md) | Feb 28, 2024 | | Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47040](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47040.md) | Feb 28, 2024 | --- Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.