| 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-2024-42265: protect the fetch of ->fd[fd] in do_dup2() from mispredictions |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| protect the fetch of ->fd[fd] in do_dup2() from mispredictions |
| |
| both callers have verified that fd is not greater than ->max_fds; |
| however, misprediction might end up with |
| tofree = fdt->fd[fd]; |
| being speculatively executed. That's wrong for the same reasons |
| why it's wrong in close_fd()/file_close_fd_locked(); the same |
| solution applies - array_index_nospec(fd, fdt->max_fds) could differ |
| from fd only in case of speculative execution on mispredicted path. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42265 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.19.320 with commit ed42e8ff509d2a61c6642d1825032072dab79f26 |
| Fixed in 5.4.282 with commit 41a6c31df77bd8e050136b0a200b537da9e1084a |
| Fixed in 5.10.224 with commit 08775b3d6ed117cf4518754ec7300ee42b6a5368 |
| Fixed in 5.15.165 with commit 3f480493550b6a23d3a65d095d6569d4a7f56a0f |
| Fixed in 6.1.104 with commit 5db999fff545b924b24c9afd368ef5c17279b176 |
| Fixed in 6.6.45 with commit da72e783afd27d9f487836b2e6738146c0edd149 |
| Fixed in 6.10.4 with commit 1171ceccabfd596ca370c5d2cbb47d110c3f2fe1 |
| Fixed in 6.11 with commit 8aa37bde1a7b645816cda8b80df4753ecf172bf1 |
| |
| 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-2024-42265 |
| 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/file.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/ed42e8ff509d2a61c6642d1825032072dab79f26 |
| https://git.kernel.org/stable/c/41a6c31df77bd8e050136b0a200b537da9e1084a |
| https://git.kernel.org/stable/c/08775b3d6ed117cf4518754ec7300ee42b6a5368 |
| https://git.kernel.org/stable/c/3f480493550b6a23d3a65d095d6569d4a7f56a0f |
| https://git.kernel.org/stable/c/5db999fff545b924b24c9afd368ef5c17279b176 |
| https://git.kernel.org/stable/c/da72e783afd27d9f487836b2e6738146c0edd149 |
| https://git.kernel.org/stable/c/1171ceccabfd596ca370c5d2cbb47d110c3f2fe1 |
| https://git.kernel.org/stable/c/8aa37bde1a7b645816cda8b80df4753ecf172bf1 |
