EUVD-2026-39268
GHSA-fgqh-527q-6hx4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AC:H over NVD's AC:L because two independent conditions (NIC closed and PCIe error concurrent) must align; all other metrics match the description and NVD vector.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
bnxt_en: Fix NULL pointer dereference
PCIe errors detected by a Root Port or Downstream Port cause error recovery services to run on all subordinate devices regardless of administrative state.
The .error_detected() callback, bnxt_io_error_detected(), disables and synchronizes IRQs via bnxt_disable_int_sync(), which calls bnxt_cp_num_to_irq_num() to map completion rings to IRQs using bp->bnapi.
Since bp->bnapi is allocated on NIC open and freed on NIC close, PCIe error recovery on a closed NIC can dereference a NULL pointer.
Check if bp->bnapi is NULL before disabling and synchronizing IRQs.
AnalysisAI
NULL pointer dereference in the Linux kernel bnxt_en Broadcom NetXtreme Ethernet driver crashes the kernel when PCIe error recovery fires against a closed NIC, causing a denial of service. Affected kernel versions span from 4.17 through multiple LTS and mainline branches up to 7.1-rc4, with patches released across all active stable series. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two conditions must hold simultaneously: (1) the bnxt_en driver is loaded and the Broadcom NetXtreme NIC is in a closed/down state so that bp->bnapi has been freed and is NULL - this occurs after ip link set down, ifconfig down, or during driver shutdown; and (2) a PCIe error is detected by the upstream Root Port or Downstream Port connected to that adapter, causing the AER recovery subsystem to invoke the .error_detected() callback. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 5.5 Medium with AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H reflects a local, low-privilege denial-of-service path. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An administrator brings a Broadcom NetXtreme NIC down for maintenance (ip link set eth0 down), leaving bp->bnapi freed. A concurrent PCIe link error - from hardware instability, a bad cable, or an error injection test - causes the kernel AER subsystem to invoke bnxt_io_error_detected() on the closed device, dereferencing the NULL bp->bnapi pointer inside bnxt_cp_num_to_irq_num() and triggering a kernel panic that crashes the host. … |
| Remediation | Upgrade to a patched kernel version appropriate to the deployed stable branch: 5.15.210+ for 5.15.x LTS, 6.1.176+ for 6.1.x LTS, 6.6.143+ for 6.6.x LTS, 6.12.94+ for 6.12.x LTS, 6.18.36+ for 6.18.x, 7.0.13+ for 7.0.x, or 7.1 stable for mainline. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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