| 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-2024-41096: PCI/MSI: Fix UAF in msi_capability_init |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| PCI/MSI: Fix UAF in msi_capability_init |
| |
| KFENCE reports the following UAF: |
| |
| BUG: KFENCE: use-after-free read in __pci_enable_msi_range+0x2c0/0x488 |
| |
| Use-after-free read at 0x0000000024629571 (in kfence-#12): |
| __pci_enable_msi_range+0x2c0/0x488 |
| pci_alloc_irq_vectors_affinity+0xec/0x14c |
| pci_alloc_irq_vectors+0x18/0x28 |
| |
| kfence-#12: 0x0000000008614900-0x00000000e06c228d, size=104, cache=kmalloc-128 |
| |
| allocated by task 81 on cpu 7 at 10.808142s: |
| __kmem_cache_alloc_node+0x1f0/0x2bc |
| kmalloc_trace+0x44/0x138 |
| msi_alloc_desc+0x3c/0x9c |
| msi_domain_insert_msi_desc+0x30/0x78 |
| msi_setup_msi_desc+0x13c/0x184 |
| __pci_enable_msi_range+0x258/0x488 |
| pci_alloc_irq_vectors_affinity+0xec/0x14c |
| pci_alloc_irq_vectors+0x18/0x28 |
| |
| freed by task 81 on cpu 7 at 10.811436s: |
| msi_domain_free_descs+0xd4/0x10c |
| msi_domain_free_locked.part.0+0xc0/0x1d8 |
| msi_domain_alloc_irqs_all_locked+0xb4/0xbc |
| pci_msi_setup_msi_irqs+0x30/0x4c |
| __pci_enable_msi_range+0x2a8/0x488 |
| pci_alloc_irq_vectors_affinity+0xec/0x14c |
| pci_alloc_irq_vectors+0x18/0x28 |
| |
| Descriptor allocation done in: |
| __pci_enable_msi_range |
| msi_capability_init |
| msi_setup_msi_desc |
| msi_insert_msi_desc |
| msi_domain_insert_msi_desc |
| msi_alloc_desc |
| ... |
| |
| Freed in case of failure in __msi_domain_alloc_locked() |
| __pci_enable_msi_range |
| msi_capability_init |
| pci_msi_setup_msi_irqs |
| msi_domain_alloc_irqs_all_locked |
| msi_domain_alloc_locked |
| __msi_domain_alloc_locked => fails |
| msi_domain_free_locked |
| ... |
| |
| That failure propagates back to pci_msi_setup_msi_irqs() in |
| msi_capability_init() which accesses the descriptor for unmasking in the |
| error exit path. |
| |
| Cure it by copying the descriptor and using the copy for the error exit path |
| unmask operation. |
| |
| [ tglx: Massaged change log ] |
| |
| The Linux kernel CVE team has assigned CVE-2024-41096 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.17 with commit bf6e054e0e3fbc9614355b760e18c8a14f952a4e and fixed in 6.1.109 with commit 0ae40b2d0a5de6b045504098e365d4fdff5bbeba |
| Issue introduced in 5.17 with commit bf6e054e0e3fbc9614355b760e18c8a14f952a4e and fixed in 6.6.37 with commit ff1121d2214b794dc1772081f27bdd90721a84bc |
| Issue introduced in 5.17 with commit bf6e054e0e3fbc9614355b760e18c8a14f952a4e and fixed in 6.9.8 with commit 45fc8d20e0768ab0a0ad054081d0f68aa3c83976 |
| Issue introduced in 5.17 with commit bf6e054e0e3fbc9614355b760e18c8a14f952a4e and fixed in 6.10 with commit 9eee5330656bf92f51cb1f09b2dc9f8cf975b3d1 |
| |
| 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-2024-41096 |
| 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: |
| drivers/pci/msi/msi.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/0ae40b2d0a5de6b045504098e365d4fdff5bbeba |
| https://git.kernel.org/stable/c/ff1121d2214b794dc1772081f27bdd90721a84bc |
| https://git.kernel.org/stable/c/45fc8d20e0768ab0a0ad054081d0f68aa3c83976 |
| https://git.kernel.org/stable/c/9eee5330656bf92f51cb1f09b2dc9f8cf975b3d1 |
