# CVE-2023-1583: linux: A NULL pointer dereference was found in io_file_bitmap_get in io_uring/filetable.c in the io_uring sub-component in t...

CVE-2023-1583 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2023-1583, released March 24, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-1583
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 24, 2023

## Description

A NULL pointer dereference was found in io_file_bitmap_get in io_uring/filetable.c in the io_uring sub-component in the Linux Kernel. When fixed files are unregistered, some context information (file_alloc_{start,end} and alloc_hint) is not cleared. A subsequent request that has auto index selection enabled via IORING_FILE_INDEX_ALLOC can cause a NULL pointer dereference. An unprivileged user can use the flaw to cause a system crash.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | bpftool-debuginfo amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-debuginfo amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-devel amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-headers amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-libbpf amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-libbpf-devel amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-libbpf-static amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-livepatch-6.1.23-36.46 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-tools amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-tools-debuginfo amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | kernel-tools-devel amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.25-1 | [DEBIAN-CVE-2023-1583](https://patchblox.com/security/data/fix/linux/debian-cve-2023-1583.md) | Mar 24, 2023 |
| Linux | linux Debian 13.5 (trixie) | 6.1.25-1 | [DEBIAN-CVE-2023-1583](https://patchblox.com/security/data/fix/linux/debian-cve-2023-1583.md) | Mar 24, 2023 |
| Linux | linux Debian 14 | 6.1.25-1 | [DEBIAN-CVE-2023-1583](https://patchblox.com/security/data/fix/linux/debian-cve-2023-1583.md) | Mar 24, 2023 |
| Linux | perf amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | perf-debuginfo amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | python3-perf amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |
| Linux | python3-perf-debuginfo amzn 2023 | 6.1.23-36.46.amzn2023 | [ALAS2023-2025-1054](https://patchblox.com/security/data/fix/linux/alas2023-2025-1054.md) | Jul 1, 2025 |

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