| 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-2024-38566: bpf: Fix verifier assumptions about socket->sk |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bpf: Fix verifier assumptions about socket->sk |
| |
| The verifier assumes that 'sk' field in 'struct socket' is valid |
| and non-NULL when 'socket' pointer itself is trusted and non-NULL. |
| That may not be the case when socket was just created and |
| passed to LSM socket_accept hook. |
| Fix this verifier assumption and adjust tests. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38566 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.4 with commit 6fcd486b3a0a628c41f12b3a7329a18a2c74b351 and fixed in 6.6.33 with commit 39f8a29330f433000e716eefc4b9abda05b71a82 |
| Issue introduced in 6.4 with commit 6fcd486b3a0a628c41f12b3a7329a18a2c74b351 and fixed in 6.8.12 with commit 6f5ae91172a93abac9720ba94edf3ec8f4d7f24f |
| Issue introduced in 6.4 with commit 6fcd486b3a0a628c41f12b3a7329a18a2c74b351 and fixed in 6.9.3 with commit c58ccdd2483a1d990748cdaf94206b5d5986a001 |
| Issue introduced in 6.4 with commit 6fcd486b3a0a628c41f12b3a7329a18a2c74b351 and fixed in 6.10 with commit 0db63c0b86e981a1e97d2596d64ceceba1a5470e |
| |
| 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-2024-38566 |
| 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/verifier.c |
| tools/testing/selftests/bpf/progs/bench_local_storage_create.c |
| tools/testing/selftests/bpf/progs/local_storage.c |
| tools/testing/selftests/bpf/progs/lsm_cgroup.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/39f8a29330f433000e716eefc4b9abda05b71a82 |
| https://git.kernel.org/stable/c/6f5ae91172a93abac9720ba94edf3ec8f4d7f24f |
| https://git.kernel.org/stable/c/c58ccdd2483a1d990748cdaf94206b5d5986a001 |
| https://git.kernel.org/stable/c/0db63c0b86e981a1e97d2596d64ceceba1a5470e |
