| 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-2024-38574: libbpf: Prevent null-pointer dereference when prog to load has no BTF |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| libbpf: Prevent null-pointer dereference when prog to load has no BTF |
| |
| In bpf_objec_load_prog(), there's no guarantee that obj->btf is non-NULL |
| when passing it to btf__fd(), and this function does not perform any |
| check before dereferencing its argument (as bpf_object__btf_fd() used to |
| do). As a consequence, we get segmentation fault errors in bpftool (for |
| example) when trying to load programs that come without BTF information. |
| |
| v2: Keep btf__fd() in the fix instead of reverting to bpf_object__btf_fd(). |
| |
| The Linux kernel CVE team has assigned CVE-2024-38574 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit df7c3f7d3a3ddab31ca8cfa9b86a8729ec43fd2e and fixed in 6.8.12 with commit ef80b59acfa4dee4b5eaccb15572b69248831104 |
| Issue introduced in 6.8 with commit df7c3f7d3a3ddab31ca8cfa9b86a8729ec43fd2e and fixed in 6.9.3 with commit 1fd91360a75833b7110af9834ae26c977e1273e0 |
| Issue introduced in 6.8 with commit df7c3f7d3a3ddab31ca8cfa9b86a8729ec43fd2e and fixed in 6.10 with commit 9bf48fa19a4b1d186e08b20bf7e5de26a15644fb |
| |
| 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-2024-38574 |
| 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: |
| tools/lib/bpf/libbpf.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/ef80b59acfa4dee4b5eaccb15572b69248831104 |
| https://git.kernel.org/stable/c/1fd91360a75833b7110af9834ae26c977e1273e0 |
| https://git.kernel.org/stable/c/9bf48fa19a4b1d186e08b20bf7e5de26a15644fb |
