| 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-2023-53000: netlink: prevent potential spectre v1 gadgets |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netlink: prevent potential spectre v1 gadgets |
| |
| Most netlink attributes are parsed and validated from |
| __nla_validate_parse() or validate_nla() |
| |
| u16 type = nla_type(nla); |
| |
| if (type == 0 || type > maxtype) { |
| /* error or continue */ |
| } |
| |
| @type is then used as an array index and can be used |
| as a Spectre v1 gadget. |
| |
| array_index_nospec() can be used to prevent leaking |
| content of kernel memory to malicious users. |
| |
| This should take care of vast majority of netlink uses, |
| but an audit is needed to take care of others where |
| validation is not yet centralized in core netlink functions. |
| |
| The Linux kernel CVE team has assigned CVE-2023-53000 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.15 with commit bfa83a9e03cf8d501c6272999843470afecb32ed and fixed in 5.4.231 with commit 3e5082b1c66c7783fbcd79b5b178573230e528ff |
| Issue introduced in 2.6.15 with commit bfa83a9e03cf8d501c6272999843470afecb32ed and fixed in 5.10.166 with commit 539ca5dcbc91134bbe2c45677811c31d8b030d2d |
| Issue introduced in 2.6.15 with commit bfa83a9e03cf8d501c6272999843470afecb32ed and fixed in 5.15.91 with commit 41b74e95f297ac360ca7ed6bf200100717cb6c45 |
| Issue introduced in 2.6.15 with commit bfa83a9e03cf8d501c6272999843470afecb32ed and fixed in 6.1.9 with commit 992e4ff7116a77968039277b5d6aaa535c2f2184 |
| Issue introduced in 2.6.15 with commit bfa83a9e03cf8d501c6272999843470afecb32ed and fixed in 6.2 with commit f0950402e8c76e7dcb08563f1b4e8000fbc62455 |
| |
| 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-2023-53000 |
| 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: |
| lib/nlattr.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/3e5082b1c66c7783fbcd79b5b178573230e528ff |
| https://git.kernel.org/stable/c/539ca5dcbc91134bbe2c45677811c31d8b030d2d |
| https://git.kernel.org/stable/c/41b74e95f297ac360ca7ed6bf200100717cb6c45 |
| https://git.kernel.org/stable/c/992e4ff7116a77968039277b5d6aaa535c2f2184 |
| https://git.kernel.org/stable/c/f0950402e8c76e7dcb08563f1b4e8000fbc62455 |
