CVE-2026-98616
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: reset num_napi when the napi vectors are freed fbn->num_napi is the count of live napi vectors, each of which owns an IRQ. The PM path had freed them without clearing the count. fbnic_pm_suspend() tears the datapath down via ndo_stop() and frees the IRQs, but leaves netif_running() true so resume knows to re-open. Resume rebuilds the datapath in __fbnic_pm_resume() and fbnic_reset_queues() sets num_napi and __fbnic_open() re-allocates the vectors. When the datapath is torn down but never rebuilt, num_napi is left pointing at freed vectors under 2 different scenarios: - a PCIe error recovery that fails (fbnic_err_slot_reset() -> __fbnic_pm_resume() returns an error -> PCI_ERS_RESULT_DISCONNECT), so .resume never runs; or - an __fbnic_open() that fails partway on resume and unwinds, freeing the vectors after fbnic_reset_queues() has already set num_napi. The netdev is then running with num_napi > 0 but napi[] freed, and the eventual remove/unbind close re-enters fbnic_down() -> fbnic_dbg_down() and dereferences the freed vectors: BUG: kernel NULL pointer dereference, address: 0000000000000210 RIP: fbnic_dbg_down+0x28 Clear num_napi when the vectors are freed: in the suspend teardown (a good resume re-establishes it before __fbnic_open()) and on the resume open failure. A redundant ndo_stop() then walks an empty napi[]. The normal ndo_stop() down/up cycle is untouched and keeps num_napi for the next ndo_open().
View original CVE JSON
{
"id": "CVE-2026-98616",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-18T16:17:14.497",
"lastModified": "2026-10-19T10:19:25.627",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: reset num_napi when the napi vectors are freed\n\nfbn->num_napi is the count of live napi vectors, each of which owns an\nIRQ. The PM path had freed them without clearing the count.\nfbnic_pm_suspend() tears the datapath down via ndo_stop() and frees the\nIRQs, but leaves netif_running() true so resume knows to re-open. Resume\nrebuilds the datapath in __fbnic_pm_resume() and fbnic_reset_queues() sets\nnum_napi and __fbnic_open() re-allocates the vectors.\n\nWhen the datapath is torn down but never rebuilt, num_napi is left\npointing at freed vectors under 2 different scenarios:\n - a PCIe error recovery that fails (fbnic_err_slot_reset() ->\n __fbnic_pm_resume() returns an error -> PCI_ERS_RESULT_DISCONNECT), so\n .resume never runs; or\n - an __fbnic_open() that fails partway on resume and unwinds, freeing\n the vectors after fbnic_reset_queues() has already set num_napi.\n\nThe netdev is then running with num_napi > 0 but napi[] freed, and the\neventual remove/unbind close re-enters fbnic_down() -> fbnic_dbg_down()\nand dereferences the freed vectors:\n BUG: kernel NULL pointer dereference, address: 0000000000000210\n RIP: fbnic_dbg_down+0x28\n\nClear num_napi when the vectors are freed: in the suspend teardown (a\ngood resume re-establishes it before __fbnic_open()) and on the resume\nopen failure. A redundant ndo_stop() then walks an empty napi[]. The\nnormal ndo_stop() down/up cycle is untouched and keeps num_napi for the\nnext ndo_open()."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/net/ethernet/meta/fbnic/fbnic_pci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "bc6107771bb4be3009168cfda24d22131c026fe8",
"lessThan": "c5b5aee41b9f5ed0743344be1c7b544555fa3cb9",
"versionType": "git",
"status": "affected"
},
{
"version": "bc6107771bb4be3009168cfda24d22131c026fe8",
"lessThan": "4f4b767ffea7653a00904383908536e754f8ef5b",
"versionType": "git",
"status": "affected"
},
{
"version": "bc6107771bb4be3009168cfda24d22131c026fe8",
"lessThan": "4bcc4a92c603fe7f062cea22e20da2e0ad6b12c3",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/net/ethernet/meta/fbnic/fbnic_pci.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.11",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.11",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.55",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.9",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/4bcc4a92c603fe7f062cea22e20da2e0ad6b12c3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4f4b767ffea7653a00904383908536e754f8ef5b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c5b5aee41b9f5ed0743344be1c7b544555fa3cb9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}