net: mana: Cap MSI-X vectors to the device MSI-X table size

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Summary

CVECVE-2026-90082
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:57 UTC
Updated2026-09-17 17:16:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: mana: Cap MSI-X vectors to the device MSI-X table size mana_gd_query_max_resources() sizes gc->num_msix_usable from resp.max_msix and the CPU count, but never from the device MSI-X table. On a 1792 vCPU M-series VM that yields 1793 while the table has 1024 entries, and mana_gd_setup_remaining_irqs() then walks indices 1..1792, running off the end of the region mapped by msix_map_region(): BUG: unable to handle page fault for address: ff8e347f8b99800c RIP: 0010:msix_prepare_msi_desc+0x7a/0x90 RAX: 0000000000004000 RBX: ff4330cb164ea780 RCX: ff8e347f8b998000 Call Trace: <TASK> __msi_domain_alloc_irqs+0x13a/0x440 msi_domain_alloc_irq_at+0x149/0x1b0 mana_gd_setup+0x351/0x890 mana_gd_probe+0x274/0x390 </TASK> RAX is index 1024 * PCI_MSIX_ENTRY_SIZE, one entry past the table. msi_insert_desc() does range check the index, but only against the MSI domain hwsize, which matches the table only for devices on an MSI parent domain. With a global PCI/MSI domain hwsize is MSI_XA_DOMAIN_SIZE, so nothing bounds the request. Cap num_msix_usable with pci_msix_vec_count().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 755391121038c06cb653241aa94dcabd87179f62 4f9827b314ee57cd99f86f8dbadcaf567112e2b2 git Not specified
CNA Linux Linux affected 755391121038c06cb653241aa94dcabd87179f62 2c7493f980140a5c40eb4f98f97c557193a2c330 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2c7493f980140a5c40eb4f98f97c557193a2c330 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f9827b314ee57cd99f86f8dbadcaf567112e2b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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