| 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-2022-48933: netfilter: nf_tables: fix memory leak during stateful obj update |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netfilter: nf_tables: fix memory leak during stateful obj update |
| |
| stateful objects can be updated from the control plane. |
| The transaction logic allocates a temporary object for this purpose. |
| |
| The ->init function was called for this object, so plain kfree() leaks |
| resources. We must call ->destroy function of the object. |
| |
| nft_obj_destroy does this, but it also decrements the module refcount, |
| but the update path doesn't increment it. |
| |
| To avoid special-casing the update object release, do module_get for |
| the update case too and release it via nft_obj_destroy(). |
| |
| The Linux kernel CVE team has assigned CVE-2022-48933 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4 with commit d62d0ba97b5803183e70cfded7f7b9da76893bf5 and fixed in 5.4.182 with commit 53026346a94c43f35c32b18804041bc483271d87 |
| Issue introduced in 5.4 with commit d62d0ba97b5803183e70cfded7f7b9da76893bf5 and fixed in 5.10.103 with commit 7e9880e81d3fd6a43c202f205717485290432826 |
| Issue introduced in 5.4 with commit d62d0ba97b5803183e70cfded7f7b9da76893bf5 and fixed in 5.15.26 with commit e96e204ee6fa46702f6c94c3c69a09e69e0eac52 |
| Issue introduced in 5.4 with commit d62d0ba97b5803183e70cfded7f7b9da76893bf5 and fixed in 5.16.12 with commit 34bb90e407e3288f610558beaae54ecaa32b11c4 |
| Issue introduced in 5.4 with commit d62d0ba97b5803183e70cfded7f7b9da76893bf5 and fixed in 5.17 with commit dad3bdeef45f81a6e90204bcc85360bb76eccec7 |
| |
| 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-2022-48933 |
| 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/netfilter/nf_tables_api.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/53026346a94c43f35c32b18804041bc483271d87 |
| https://git.kernel.org/stable/c/7e9880e81d3fd6a43c202f205717485290432826 |
| https://git.kernel.org/stable/c/e96e204ee6fa46702f6c94c3c69a09e69e0eac52 |
| https://git.kernel.org/stable/c/34bb90e407e3288f610558beaae54ecaa32b11c4 |
| https://git.kernel.org/stable/c/dad3bdeef45f81a6e90204bcc85360bb76eccec7 |
