linux: An issue was discovered in the Linux kernel before 6.3.3
CVE-2023-34256 is fixed in 20 products on 1 platform, first by ALAS2023-2023-184, released May 25, 2023. It is not reported as exploited. Patch Radar priority: Routine.
An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an offset. NOTE: this is disputed by third parties because the kernel is not intended to defend against attackers with the stated "When modifying the block device while it is mounted by the filesystem" access.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bpftool · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| bpftool-debuginfo · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-debuginfo · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-debuginfo-common-aarch64 · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-debuginfo-common-x86_64 · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-devel · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-headers · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-libbpf · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-libbpf-devel · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-libbpf-static · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-livepatch-6.1.29-47.49 · amzn 2023 | 1.0-0.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-tools · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-tools-debuginfo · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| kernel-tools-devel · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| linux · Debian 12.15 (bookworm) | 6.1.37-1 | DEBIAN-CVE-2023-34256 | May 31, 2023 |
| linux · Debian 13.5 (trixie) | 6.3.7-1 | DEBIAN-CVE-2023-34256 | May 31, 2023 |
| linux · Debian 14 | 6.3.7-1 | DEBIAN-CVE-2023-34256 | May 31, 2023 |
| perf · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| perf-debuginfo · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| python3-perf · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
| python3-perf-debuginfo · amzn 2023 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 | May 25, 2023 |
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