CVE-2026-64210
Estado: ModificadaAlta (7.5)—
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: xsk: Fix unlocked writing to ICOSQ
During napi poll, when the affinity changes and there's still XSK work to be done, we trigger an ICOSQ interrupt on the new CPU. However, this triggering on the ICOSQ is done unprotected.
There are 2 such races:
A) mlx5e_trigger_irq() is called while mlx5e_xsk_alloc_rx_mpwqe() is running from a different CPU due to affinity change. This can happen because IRQ triggering is done after napi_complete_done(). At this point the NAPI can be scheduled on a different CPU. Like this:
B) mlx5e_trigger_irq() is called on the ICOSQ when mlx5e_trigger_napi_icosq() is running.
Leer descripción completaMostrar menos
The obvious fix would be to lock the ICOSQ. But ICOSQ has an optimized locking scheme that doesn't work for this scenario. Kick the async ICOSQ instead which is always locked.
This issue was noticed in the wild with the following splat:
Detalles técnicos trazas, registros y código del informe original
CPU A (old affinity, NAPI tail) CPU B (new affinity, fresh NAPI)
------------------------------- --------------------------------
napi_complete_done() clears SCHED
mlx5e_cq_arm(...)
napi_schedule_prep() sets SCHED
mlx5e_napi_poll()
mlx5e_xsk_alloc_rx_mpwqe()
mlx5e_icosq_sync_lock() // noop
memcpy 640 B UMR body
advance sq->pc by 10
mlx5e_trigger_irq(&c->icosq)
wqe_info[pi] = {NOP, 1}
mlx5e_post_nop() advances sq->pc
netdevice: ge-0-0-1: Bad OP in ICOSQ CQE: 0xd
WARNING: drivers/net/ethernet/mellanox/mlx5/core/en_rx.c:826 [...]
[...]
Call Trace:
<IRQ>
mlx5e_napi_poll+0x11d/0x7f0 [mlx5_core]
__napi_poll+0x30/0x200
? skb_defer_free_flush+0x9c/0xc0
net_rx_action+0x2fe/0x3f0
handle_softirqs+0xd8/0x340
__irq_exit_rcu+0xbc/0xe0
common_interrupt+0x85/0xa0
</IRQ>
<TASK>
asm_common_interrupt+0x26/0x40
[...]
---[ end trace 0000000000000000 ]---
mlx5_core 0000:08:00.0 ge-0-0-1: Error cqe on cqn 0x548, ci 0x2022, qn 0x8f4,
opcode 0xd, syndrome 0x2, vendor syndrome 0x68
00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000030: 00 00 00 00 01 00 68 02 01 00 08 f4 de 14 59 d2
WQE DUMP: WQ size 16384 WQ cur size 0, WQE index 0x1e14, len: 64
00000000: 00 00 00 01 d9 ed 80 02 00 00 00 01 d9 ed 90 02
00000010: 00 00 00 01 d9 ed a0 02 00 00 00 01 d9 ed b0 02
00000020: 00 00 00 01 d9 ed c0 02 00 00 00 01 d9 ed d0 02
00000030: 00 00 00 01 d9 ed e0 02 00 00 00 01 d9 ed f0 02
mlx5_core 0000:08:00.0 ge-0-0-1: Error cqe on cqn 0x548, ci 0x2023, qn 0x8f4,
opcode 0xd, syndrome 0x5, vendor syndrome 0xf9
00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000030: 00 00 00 00 01 00 f9 05 01 00 08 f4 de 15 cf d2CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.48%
- Percentil entre todas las CVEs puntuadas: 39
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access60 % - Impacto principal
T1499Endpoint Denial of Serviceimpact55 %
Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/0c8f331485656d5937d56a488016b944a038fe2f
- https://git.kernel.org/stable/c/54a97ef1025236cc1bc54d79c7ae2eb8027ce4b8
- https://git.kernel.org/stable/c/8d3b91e7d81000d295cd914d4d9d6f860252e2bf
- https://git.kernel.org/stable/c/c326f9c68921e2f14dfcecb2f6b4216313d50248
- https://git.kernel.org/stable/c/f37adef34eb7ebe29a534d20ccadd72bd7ff664e
- https://git.kernel.org/stable/c/f3d8c2fd591bb603b069e151881a317e26a3f478
JSON original (NVD)
Mostrar
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"id": "CVE-2026-64210",
"cveTags": [],
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
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"published": "2026-07-24T16:16:48.623",
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"source": "nvd@nist.gov",
"description": [
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"value": "NVD-CWE-noinfo"
}
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: xsk: Fix unlocked writing to ICOSQ\n\nDuring napi poll, when the affinity changes and there's still XSK work\nto be done, we trigger an ICOSQ interrupt on the new CPU. However, this\ntriggering on the ICOSQ is done unprotected.\n\nThere are 2 such races:\n\nA) mlx5e_trigger_irq() is called while mlx5e_xsk_alloc_rx_mpwqe() is\nrunning from a different CPU due to affinity change. This can happen\nbecause IRQ triggering is done after napi_complete_done(). At this point\nthe NAPI can be scheduled on a different CPU. Like this:\n\n CPU A (old affinity, NAPI tail) CPU B (new affinity, fresh NAPI)\n ------------------------------- --------------------------------\n napi_complete_done() clears SCHED\n mlx5e_cq_arm(...)\n napi_schedule_prep() sets SCHED\n mlx5e_napi_poll()\n mlx5e_xsk_alloc_rx_mpwqe()\n mlx5e_icosq_sync_lock() // noop\n memcpy 640 B UMR body\n advance sq->pc by 10\n mlx5e_trigger_irq(&c->icosq)\n wqe_info[pi] = {NOP, 1}\n mlx5e_post_nop() advances sq->pc\n\nB) mlx5e_trigger_irq() is called on the ICOSQ when\nmlx5e_trigger_napi_icosq() is running.\n\nThe obvious fix would be to lock the ICOSQ. But ICOSQ has an optimized\nlocking scheme that doesn't work for this scenario. Kick the async ICOSQ\ninstead which is always locked.\n\nThis issue was noticed in the wild with the following splat:\n\n netdevice: ge-0-0-1: Bad OP in ICOSQ CQE: 0xd\n WARNING: drivers/net/ethernet/mellanox/mlx5/core/en_rx.c:826 [...]\n [...]\n Call Trace:\n <IRQ>\n mlx5e_napi_poll+0x11d/0x7f0 [mlx5_core]\n __napi_poll+0x30/0x200\n ? skb_defer_free_flush+0x9c/0xc0\n net_rx_action+0x2fe/0x3f0\n handle_softirqs+0xd8/0x340\n __irq_exit_rcu+0xbc/0xe0\n common_interrupt+0x85/0xa0\n </IRQ>\n <TASK>\n asm_common_interrupt+0x26/0x40\n [...]\n ---[ end trace 0000000000000000 ]---\n mlx5_core 0000:08:00.0 ge-0-0-1: Error cqe on cqn 0x548, ci 0x2022, qn 0x8f4,\n opcode 0xd, syndrome 0x2, vendor syndrome 0x68\n 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n 00000030: 00 00 00 00 01 00 68 02 01 00 08 f4 de 14 59 d2\n WQE DUMP: WQ size 16384 WQ cur size 0, WQE index 0x1e14, len: 64\n 00000000: 00 00 00 01 d9 ed 80 02 00 00 00 01 d9 ed 90 02\n 00000010: 00 00 00 01 d9 ed a0 02 00 00 00 01 d9 ed b0 02\n 00000020: 00 00 00 01 d9 ed c0 02 00 00 00 01 d9 ed d0 02\n 00000030: 00 00 00 01 d9 ed e0 02 00 00 00 01 d9 ed f0 02\n mlx5_core 0000:08:00.0 ge-0-0-1: Error cqe on cqn 0x548, ci 0x2023, qn 0x8f4,\n opcode 0xd, syndrome 0x5, vendor syndrome 0xf9\n 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n 00000030: 00 00 00 00 01 00 f9 05 01 00 08 f4 de 15 cf d2"
}
],
"lastModified": "2026-09-14T12:17:44.213",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
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