CVE-2024-41096: PCI/MSI: Fix UAF in msi_capability_init
First published: Mon Jul 29 2024(Updated: )
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 ]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.6.37 | 6.6.37 |
| redhat/kernel | <6.9.8 | 6.9.8 |
| redhat/kernel | <6.10 | 6.10 |
| Linux Kernel | >=5.17<6.6.37 | |
| Linux Kernel | >=6.7<6.9.8 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| debian/linux-6.1 | 6.1.128-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/0ae40b2d0a5de6b045504098e365d4fdff5bbeba
- https://git.kernel.org/stable/c/45fc8d20e0768ab0a0ad054081d0f68aa3c83976
- https://git.kernel.org/stable/c/9eee5330656bf92f51cb1f09b2dc9f8cf975b3d1
- https://git.kernel.org/stable/c/ff1121d2214b794dc1772081f27bdd90721a84bc
- https://lore.kernel.org/linux-cve-announce/2024072954-CVE-2024-41096-4ed0@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2301686
- https://access.redhat.com/errata/RHSA-2024:6567
- https://bugzilla.redhat.com/show_bug.cgi?id=2300491
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-41096
- https://nvd.nist.gov/vuln/detail/CVE-2024-41096
- https://launchpad.net/bugs/cve/CVE-2024-41096
- https://security-tracker.debian.org/tracker/CVE-2024-41096
- https://ubuntu.com/security/CVE-2024-41096
- https://git.kernel.org/linus/9eee5330656bf92f51cb1f09b2dc9f8cf975b3d1
Frequently Asked Questions
What is the severity of CVE-2024-41096?
CVE-2024-41096 is classified as a high severity vulnerability due to the potential for use-after-free exploitation in the Linux kernel.
What systems are affected by CVE-2024-41096?
CVE-2024-41096 affects multiple versions of the Linux kernel including versions prior to 6.6.37, 6.9.8, and 6.10.
How do I fix CVE-2024-41096?
To remediate CVE-2024-41096, update your Linux kernel to the latest versions: 6.6.37, 6.9.8, 6.10 or applicable patched versions.
What are the symptoms of CVE-2024-41096 exploitation?
Exploitation of CVE-2024-41096 may lead to system crashes or unexpected behavior due to use-after-free vulnerabilities.
Can CVE-2024-41096 be exploited remotely?
Yes, CVE-2024-41096 may allow remote code execution through crafted PCI/MSI requests, increasing the risk of exploitation.
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