| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-36918: bpf: Check bloom filter map value size |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bpf: Check bloom filter map value size |
| |
| This patch adds a missing check to bloom filter creating, rejecting |
| values above KMALLOC_MAX_SIZE. This brings the bloom map in line with |
| many other map types. |
| |
| The lack of this protection can cause kernel crashes for value sizes |
| that overflow int's. Such a crash was caught by syzkaller. The next |
| patch adds more guard-rails at a lower level. |
| |
| The Linux kernel CVE team has assigned CVE-2024-36918 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.16 with commit 9330986c03006ab1d33d243b7cfe598a7a3c1baa and fixed in 6.1.91 with commit fa6995eeb62e74b5a1480c73fb7b420c270784d3 |
| Issue introduced in 5.16 with commit 9330986c03006ab1d33d243b7cfe598a7a3c1baa and fixed in 6.6.31 with commit 608e13706c8b6c658a0646f09ebced74ec367f7c |
| Issue introduced in 5.16 with commit 9330986c03006ab1d33d243b7cfe598a7a3c1baa and fixed in 6.8.10 with commit c418afb9bf23e2f2b76cb819601e4a5d9dbab42d |
| Issue introduced in 5.16 with commit 9330986c03006ab1d33d243b7cfe598a7a3c1baa and fixed in 6.9 with commit a8d89feba7e54e691ca7c4efc2a6264fa83f3687 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-36918 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| kernel/bpf/bloom_filter.c |
| tools/testing/selftests/bpf/prog_tests/bloom_filter_map.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/fa6995eeb62e74b5a1480c73fb7b420c270784d3 |
| https://git.kernel.org/stable/c/608e13706c8b6c658a0646f09ebced74ec367f7c |
| https://git.kernel.org/stable/c/c418afb9bf23e2f2b76cb819601e4a5d9dbab42d |
| https://git.kernel.org/stable/c/a8d89feba7e54e691ca7c4efc2a6264fa83f3687 |
