| 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-2023-52746: xfrm/compat: prevent potential spectre v1 gadget in xfrm_xlate32_attr() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| xfrm/compat: prevent potential spectre v1 gadget in xfrm_xlate32_attr() |
| |
| int type = nla_type(nla); |
| |
| if (type > XFRMA_MAX) { |
| return -EOPNOTSUPP; |
| } |
| |
| @type is then used as an array index and can be used |
| as a Spectre v1 gadget. |
| |
| if (nla_len(nla) < compat_policy[type].len) { |
| |
| array_index_nospec() can be used to prevent leaking |
| content of kernel memory to malicious users. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52746 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10 with commit 5106f4a8acff480e244300bc5097c0ad7048c3a2 and fixed in 5.10.168 with commit a893cc644812728e86e9aff517fd5698812ecef0 |
| Issue introduced in 5.10 with commit 5106f4a8acff480e244300bc5097c0ad7048c3a2 and fixed in 5.15.94 with commit 5dc688fae6b7be9dbbf5304a3d2520d038e06db5 |
| Issue introduced in 5.10 with commit 5106f4a8acff480e244300bc5097c0ad7048c3a2 and fixed in 6.1.12 with commit 419674224390fca298020fc0751a20812f84b12d |
| Issue introduced in 5.10 with commit 5106f4a8acff480e244300bc5097c0ad7048c3a2 and fixed in 6.2 with commit b6ee896385380aa621102e8ea402ba12db1cabff |
| |
| 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-2023-52746 |
| 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: |
| net/xfrm/xfrm_compat.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/a893cc644812728e86e9aff517fd5698812ecef0 |
| https://git.kernel.org/stable/c/5dc688fae6b7be9dbbf5304a3d2520d038e06db5 |
| https://git.kernel.org/stable/c/419674224390fca298020fc0751a20812f84b12d |
| https://git.kernel.org/stable/c/b6ee896385380aa621102e8ea402ba12db1cabff |
