EUVD-2026-76417
GHSA-7j5j-83jx-4ffc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Memory-pressure race condition required alongside TPA-active Rx traffic raises AC to H; no auth or interaction needed; DoS-only impact.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
qede: Fix NULL pointer dereference in TPA fragment processing
Under memory pressure, the qede driver encounters NULL pointer dereferences when processing TPA continuation fragments.
Commit 8a8633978b84 ("qede: Add build_skb() support.") accidentally dropped the assignment of tpa_info->buffer.data in qede_tpa_start().
When memory pressure causes an SKB allocation failure in qede_tpa_start(), the driver sets tpa_start_fail = true and attempts to recycle the physical page later in qede_tpa_end() via qede_reuse_page(). However, because buffer.data was left uninitialized (NULL), qede_reuse_page() pushes a "ghost" BD (valid DMA mapping but NULL data pointer) back into the active Rx ring.
The next time the hardware uses this ring slot, it passes a NULL page to qede_fill_frag_skb(), causing a kernel panic.
Example crash from production system: BUG: unable to handle kernel NULL pointer dereference at 0x8 RIP: qede_fill_frag_skb+0x96/0x430 [qede] Call Trace: qede_rx_int+0xb06/0x1de0 qede_poll+0x2f4/0x6c0 __napi_poll+0x2d/0x130
Fix the root cause by restoring the tpa_info->buffer.data assignment in qede_tpa_start(), ensuring valid pages are correctly tracked and recycled. Additionally, update the stale comment for struct qede_agg_info::buffer to reflect its current usage.
AnalysisAI
Kernel panic via NULL pointer dereference in the Linux kernel qede Ethernet driver (used by QLogic/Marvell FastLinQ NICs) can be triggered under memory pressure conditions during TPA (Transparent Packet Aggregation) fragment processing. A regression introduced by commit 8a8633978b84 omitted the assignment of tpa_info->buffer.data in qede_tpa_start(), causing a 'ghost' buffer descriptor with a NULL data pointer to be reinserted into the active Rx ring upon SKB allocation failure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Three conditions must co-occur: (1) the target host must use a QLogic/Marvell FastLinQ NIC with the qede driver loaded; (2) TPA/LRO must be enabled (the default for qede); and (3) the host must be under sufficient memory pressure at the moment a TPA aggregation session starts, causing __napi_alloc_skb() to return NULL in qede_tpa_start(). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The assigned CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) overstates the attack complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released stable-tree patches: upgrade to Linux 6.12.109, 6.18.50, 7.2.4, or 7.3-rc1 (or later). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Linux systems in production using QLogic/Marvell FastLinQ Ethernet adapters (qede driver) by checking lspci output or ethtool interface information and verify their current kernel versions against vulnerable builds. …
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Same technique Denial Of Service
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External POC / Exploit Code
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