| 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-2024-36890: mm/slab: make __free(kfree) accept error pointers |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm/slab: make __free(kfree) accept error pointers |
| |
| Currently, if an automatically freed allocation is an error pointer that |
| will lead to a crash. An example of this is in wm831x_gpio_dbg_show(). |
| |
| 171 char *label __free(kfree) = gpiochip_dup_line_label(chip, i); |
| 172 if (IS_ERR(label)) { |
| 173 dev_err(wm831x->dev, "Failed to duplicate label\n"); |
| 174 continue; |
| 175 } |
| |
| The auto clean up function should check for error pointers as well, |
| otherwise we're going to keep hitting issues like this. |
| |
| The Linux kernel CVE team has assigned CVE-2024-36890 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1.79 with commit 3c6cc62ce1265aa5623e2e1b29c0fe258bf6e232 and fixed in 6.1.91 with commit 9f6eb0ab4f95240589ee85fd9886a944cd3645b2 |
| Issue introduced in 6.5 with commit 54da6a0924311c7cf5015533991e44fb8eb12773 and fixed in 6.6.31 with commit ac6cf3ce9b7d12acb7b528248df5f87caa25fcdc |
| Issue introduced in 6.5 with commit 54da6a0924311c7cf5015533991e44fb8eb12773 and fixed in 6.8.10 with commit 79cbe0be6c0317b215ddd8bd3e32f0afdac48543 |
| Issue introduced in 6.5 with commit 54da6a0924311c7cf5015533991e44fb8eb12773 and fixed in 6.9 with commit cd7eb8f83fcf258f71e293f7fc52a70be8ed0128 |
| |
| 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-2024-36890 |
| 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: |
| include/linux/slab.h |
| |
| |
| 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/9f6eb0ab4f95240589ee85fd9886a944cd3645b2 |
| https://git.kernel.org/stable/c/ac6cf3ce9b7d12acb7b528248df5f87caa25fcdc |
| https://git.kernel.org/stable/c/79cbe0be6c0317b215ddd8bd3e32f0afdac48543 |
| https://git.kernel.org/stable/c/cd7eb8f83fcf258f71e293f7fc52a70be8ed0128 |
