| 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-2024-42235: s390/mm: Add NULL pointer check to crst_table_free() base_crst_free() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| s390/mm: Add NULL pointer check to crst_table_free() base_crst_free() |
| |
| crst_table_free() used to work with NULL pointers before the conversion |
| to ptdescs. Since crst_table_free() can be called with a NULL pointer |
| (error handling in crst_table_upgrade() add an explicit check. |
| |
| Also add the same check to base_crst_free() for consistency reasons. |
| |
| In real life this should not happen, since order two GFP_KERNEL |
| allocations will not fail, unless FAIL_PAGE_ALLOC is enabled and used. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42235 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit 6326c26c1514757242829b292b26eac589013200 and fixed in 6.6.41 with commit 794fa52b94637d6b2e8c9474fbe3983af5c9f046 |
| Issue introduced in 6.6 with commit 6326c26c1514757242829b292b26eac589013200 and fixed in 6.9.10 with commit f80bd8bb6f380bc265834c46058d38b34174813e |
| Issue introduced in 6.6 with commit 6326c26c1514757242829b292b26eac589013200 and fixed in 6.10 with commit b5efb63acf7bddaf20eacfcac654c25c446eabe8 |
| |
| 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-2024-42235 |
| 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: |
| arch/s390/mm/pgalloc.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/794fa52b94637d6b2e8c9474fbe3983af5c9f046 |
| https://git.kernel.org/stable/c/f80bd8bb6f380bc265834c46058d38b34174813e |
| https://git.kernel.org/stable/c/b5efb63acf7bddaf20eacfcac654c25c446eabe8 |
