| 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-2024-27050: libbpf: Use OPTS_SET() macro in bpf_xdp_query() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| libbpf: Use OPTS_SET() macro in bpf_xdp_query() |
| |
| When the feature_flags and xdp_zc_max_segs fields were added to the libbpf |
| bpf_xdp_query_opts, the code writing them did not use the OPTS_SET() macro. |
| This causes libbpf to write to those fields unconditionally, which means |
| that programs compiled against an older version of libbpf (with a smaller |
| size of the bpf_xdp_query_opts struct) will have its stack corrupted by |
| libbpf writing out of bounds. |
| |
| The patch adding the feature_flags field has an early bail out if the |
| feature_flags field is not part of the opts struct (via the OPTS_HAS) |
| macro, but the patch adding xdp_zc_max_segs does not. For consistency, this |
| fix just changes the assignments to both fields to use the OPTS_SET() |
| macro. |
| |
| The Linux kernel CVE team has assigned CVE-2024-27050 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit 13ce2daa259a3bfbc9a5aeeee8b9a87058703731 and fixed in 6.6.23 with commit fa5bef5e80c6a3321b2b1a7070436f3bc5daf07c |
| Issue introduced in 6.6 with commit 13ce2daa259a3bfbc9a5aeeee8b9a87058703731 and fixed in 6.7.11 with commit 682ddd62abd4bdcee7584246903e7a2df005fe0d |
| Issue introduced in 6.6 with commit 13ce2daa259a3bfbc9a5aeeee8b9a87058703731 and fixed in 6.8.2 with commit cd3be9843247edb8fc6fcd8d8237cbce2bc19f5e |
| Issue introduced in 6.6 with commit 13ce2daa259a3bfbc9a5aeeee8b9a87058703731 and fixed in 6.9 with commit 92a871ab9fa59a74d013bc04f321026a057618e7 |
| |
| 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-2024-27050 |
| 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/netlink.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/fa5bef5e80c6a3321b2b1a7070436f3bc5daf07c |
| https://git.kernel.org/stable/c/682ddd62abd4bdcee7584246903e7a2df005fe0d |
| https://git.kernel.org/stable/c/cd3be9843247edb8fc6fcd8d8237cbce2bc19f5e |
| https://git.kernel.org/stable/c/92a871ab9fa59a74d013bc04f321026a057618e7 |
