| 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-2024-38385: genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after() |
| |
| irq_find_at_or_after() dereferences the interrupt descriptor which is |
| returned by mt_find() while neither holding sparse_irq_lock nor RCU read |
| lock, which means the descriptor can be freed between mt_find() and the |
| dereference: |
| |
| CPU0 CPU1 |
| desc = mt_find() |
| delayed_free_desc(desc) |
| irq_desc_get_irq(desc) |
| |
| The use-after-free is reported by KASAN: |
| |
| Call trace: |
| irq_get_next_irq+0x58/0x84 |
| show_stat+0x638/0x824 |
| seq_read_iter+0x158/0x4ec |
| proc_reg_read_iter+0x94/0x12c |
| vfs_read+0x1e0/0x2c8 |
| |
| Freed by task 4471: |
| slab_free_freelist_hook+0x174/0x1e0 |
| __kmem_cache_free+0xa4/0x1dc |
| kfree+0x64/0x128 |
| irq_kobj_release+0x28/0x3c |
| kobject_put+0xcc/0x1e0 |
| delayed_free_desc+0x14/0x2c |
| rcu_do_batch+0x214/0x720 |
| |
| Guard the access with a RCU read lock section. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38385 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.5 with commit 721255b9826bd11c7a38b585905fc2dd0fb94e52 and fixed in 6.6.34 with commit 1c7891812d85500ae2ca4051fa5683fcf29930d8 |
| Issue introduced in 6.5 with commit 721255b9826bd11c7a38b585905fc2dd0fb94e52 and fixed in 6.9.5 with commit d084aa022f84319f8079e30882cbcbc026af9f21 |
| Issue introduced in 6.5 with commit 721255b9826bd11c7a38b585905fc2dd0fb94e52 and fixed in 6.10 with commit b84a8aba806261d2f759ccedf4a2a6a80a5e55ba |
| |
| 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-2024-38385 |
| 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: |
| kernel/irq/irqdesc.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/1c7891812d85500ae2ca4051fa5683fcf29930d8 |
| https://git.kernel.org/stable/c/d084aa022f84319f8079e30882cbcbc026af9f21 |
| https://git.kernel.org/stable/c/b84a8aba806261d2f759ccedf4a2a6a80a5e55ba |
