| 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-2024-46688: erofs: fix out-of-bound access when z_erofs_gbuf_growsize() partially fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| erofs: fix out-of-bound access when z_erofs_gbuf_growsize() partially fails |
| |
| If z_erofs_gbuf_growsize() partially fails on a global buffer due to |
| memory allocation failure or fault injection (as reported by syzbot [1]), |
| new pages need to be freed by comparing to the existing pages to avoid |
| memory leaks. |
| |
| However, the old gbuf->pages[] array may not be large enough, which can |
| lead to null-ptr-deref or out-of-bound access. |
| |
| Fix this by checking against gbuf->nrpages in advance. |
| |
| [1] https://lore.kernel.org/r/000000000000f7b96e062018c6e3@google.com |
| |
| The Linux kernel CVE team has assigned CVE-2024-46688 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.10 with commit d6db47e571dcaecaeaafa8840d00ae849ae3907b and fixed in 6.10.8 with commit 49c0e081998008cde0c872c0ff9affa1ece4b878 |
| Issue introduced in 6.10 with commit d6db47e571dcaecaeaafa8840d00ae849ae3907b and fixed in 6.11 with commit 0005e01e1e875c5e27130c5e2ed0189749d1e08a |
| |
| 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-2024-46688 |
| 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/erofs/zutil.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/49c0e081998008cde0c872c0ff9affa1ece4b878 |
| https://git.kernel.org/stable/c/0005e01e1e875c5e27130c5e2ed0189749d1e08a |
