| 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-2021-47179: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return() |
| |
| Commit de144ff4234f changes _pnfs_return_layout() to call |
| pnfs_mark_matching_lsegs_return() passing NULL as the struct |
| pnfs_layout_range argument. Unfortunately, |
| pnfs_mark_matching_lsegs_return() doesn't check if we have a value here |
| before dereferencing it, causing an oops. |
| |
| I'm able to hit this crash consistently when running connectathon basic |
| tests on NFS v4.1/v4.2 against Ontap. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47179 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.9.269 with commit 80e34f4957ec3010c85f9bb0b568a8d46acdf535 and fixed in 4.9.271 with commit 4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42 |
| Issue introduced in 4.14.233 with commit 7b7b9774643220e53eef58c15bb29bd4182fe053 and fixed in 4.14.235 with commit 42637ca25c7d7b5a92804a679af5192e8c1a9f48 |
| Issue introduced in 4.19.191 with commit 9ffa7967f9379a0a1b924e9ffeda709d72237da7 and fixed in 4.19.193 with commit 39785761feadf261bc5101372b0b0bbaf6a94494 |
| Issue introduced in 5.4.118 with commit 6be0e4b59314e4a836495f6ffdc5d2c5b079deeb and fixed in 5.4.124 with commit aba3c7795f51717ae316f3566442dee7cc3eeccb |
| Issue introduced in 5.10.36 with commit 2fafe7d5047f98791afd9a1d90d2afb70debc590 and fixed in 5.10.42 with commit f9890652185b72b8de9ebeb4406037640b6e1b53 |
| Issue introduced in 5.12.3 with commit 7e65ea887d0c0997f3053acd91a027af45e71c5b and fixed in 5.12.9 with commit b090d110e66636bca473fd8b98d5c97b555a965a |
| Issue introduced in 5.11.20 with commit 96260bde1ea8ae31a5402fe506abbb8951d5a42c |
| |
| 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-2021-47179 |
| 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: |
| fs/nfs/pnfs.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/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42 |
| https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48 |
| https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494 |
| https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccb |
| https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53 |
| https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965a |
| https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7eb |
