| 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-2021-47538: rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() |
| |
| Need to call rxrpc_put_local() for peer candidate before kfree() as it |
| holds a ref to rxrpc_local. |
| |
| [DH: v2: Changed to abstract the peer freeing code out into a function] |
| |
| The Linux kernel CVE team has assigned CVE-2021-47538 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19.82 with commit e8e51ce79c157188e209e5ea0afaf6b42dd76104 and fixed in 4.19.220 with commit 913c24af2d13a3fd304462916ee98e298d56bdce |
| Issue introduced in 5.4 with commit 9ebeddef58c41bd700419cdcece24cf64ce32276 and fixed in 5.4.164 with commit 3e70e3a72d80b16094faccbe438cd53761c3503a |
| Issue introduced in 5.4 with commit 9ebeddef58c41bd700419cdcece24cf64ce32276 and fixed in 5.10.84 with commit 60f0b9c42cb80833a03ca57c1c8b078d716e71d1 |
| Issue introduced in 5.4 with commit 9ebeddef58c41bd700419cdcece24cf64ce32276 and fixed in 5.15.7 with commit 9469273e616ca8f1b6e3773c5019f21b4c8d828c |
| Issue introduced in 5.4 with commit 9ebeddef58c41bd700419cdcece24cf64ce32276 and fixed in 5.16 with commit beacff50edbd6c9659a6f15fc7f6126909fade29 |
| Issue introduced in 5.3.9 with commit 9b7fc03b4cdbfb668b6891967105258691c6d3b5 |
| |
| 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-2021-47538 |
| 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/rxrpc/peer_object.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/913c24af2d13a3fd304462916ee98e298d56bdce |
| https://git.kernel.org/stable/c/3e70e3a72d80b16094faccbe438cd53761c3503a |
| https://git.kernel.org/stable/c/60f0b9c42cb80833a03ca57c1c8b078d716e71d1 |
| https://git.kernel.org/stable/c/9469273e616ca8f1b6e3773c5019f21b4c8d828c |
| https://git.kernel.org/stable/c/beacff50edbd6c9659a6f15fc7f6126909fade29 |
