| 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-2024-35882: SUNRPC: Fix a slow server-side memory leak with RPC-over-TCP |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| SUNRPC: Fix a slow server-side memory leak with RPC-over-TCP |
| |
| Jan Schunk reports that his small NFS servers suffer from memory |
| exhaustion after just a few days. A bisect shows that commit |
| e18e157bb5c8 ("SUNRPC: Send RPC message on TCP with a single |
| sock_sendmsg() call") is the first bad commit. |
| |
| That commit assumed that sock_sendmsg() releases all the pages in |
| the underlying bio_vec array, but the reality is that it doesn't. |
| svc_xprt_release() releases the rqst's response pages, but the |
| record marker page fragment isn't one of those, so it is never |
| released. |
| |
| This is a narrow fix that can be applied to stable kernels. A |
| more extensive fix is in the works. |
| |
| The Linux kernel CVE team has assigned CVE-2024-35882 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 and fixed in 6.6.26 with commit 1ba1291172f935e6b6fe703161a948f3347400b8 |
| Issue introduced in 6.6 with commit e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 and fixed in 6.8.5 with commit a2ebedf7bcd17a1194a0a18122c885eb578ee882 |
| Issue introduced in 6.6 with commit e18e157bb5c8c1cd8a9ba25acfdcf4f3035836f4 and fixed in 6.9 with commit 05258a0a69b3c5d2c003f818702c0a52b6fea861 |
| |
| 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-2024-35882 |
| 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/sunrpc/svcsock.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/1ba1291172f935e6b6fe703161a948f3347400b8 |
| https://git.kernel.org/stable/c/a2ebedf7bcd17a1194a0a18122c885eb578ee882 |
| https://git.kernel.org/stable/c/05258a0a69b3c5d2c003f818702c0a52b6fea861 |
