CVE-2025-71087
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: iavf: fix off-by-one issues in iavf_config_rss_reg() There are off-by-one bugs when configuring RSS hash key and lookup table, causing out-of-bounds reads to memory [1] and out-of-bounds writes to device registers. Before commit 43a3d9ba34c9 ("i40evf: Allow PF driver to configure RSS"), the loop upper bounds were: i <= I40E_VFQF_{HKEY,HLUT}_MAX_INDEX which is safe since the value is the last valid index. That commit changed the bounds to: i <= adapter->rss_{key,lut}_size / 4 where `rss_{key,lut}_size / 4` is the number of dwords, so the last valid index is `(rss_{key,lut}_size / 4) - 1`. Therefore, using `<=` accesses one element past the end. Fix the issues by using `<` instead of `<=`, ensuring we do not exceed the bounds. [1] KASAN splat about rss_key_size off-by-one BUG: KASAN: slab-out-of-bounds in iavf_config_rss+0x619/0x800 Read of size 4 at addr ffff888102c50134 by task kworker/u8:6/63 CPU: 0 UID: 0 PID: 63 Comm: kworker/u8:6 Not tainted 6.18.0-rc2-enjuk-tnguy-00378-g3005f5b77652-dirty #156 PREEMPT(voluntary) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: iavf iavf_watchdog_task Call Trace: <TASK> dump_stack_lvl+0x6f/0xb0 print_report+0x170/0x4f3 kasan_report+0xe1/0x1a0 iavf_config_rss+0x619/0x800 iavf_watchdog_task+0x2be7/0x3230 process_one_work+0x7fd/0x1420 worker_thread+0x4d1/0xd40 kthread+0x344/0x660 ret_from_fork+0x249/0x320 ret_from_fork_asm+0x1a/0x30 </TASK> Allocated by task 63: kasan_save_stack+0x30/0x50 kasan_save_track+0x14/0x30 __kasan_kmalloc+0x7f/0x90 __kmalloc_noprof+0x246/0x6f0 iavf_watchdog_task+0x28fc/0x3230 process_one_work+0x7fd/0x1420 worker_thread+0x4d1/0xd40 kthread+0x344/0x660 ret_from_fork+0x249/0x320 ret_from_fork_asm+0x1a/0x30 The buggy address belongs to the object at ffff888102c50100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes to the right of allocated 52-byte region [ffff888102c50100, ffff888102c50134) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102c50 flags: 0x200000000000000(node=0|zone=2) page_type: f5(slab) raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888102c50000: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff888102c50080: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff888102c50100: 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc fc ^ ffff888102c50180: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888102c50200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-01-13 16:16:08.343000
Last modified
2026-10-19 19:17:10.410000
View original CVE JSON
{
"id": "CVE-2025-71087",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-01-13T16:16:08.343",
"lastModified": "2026-10-19T19:17:10.410",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niavf: fix off-by-one issues in iavf_config_rss_reg()\n\nThere are off-by-one bugs when configuring RSS hash key and lookup\ntable, causing out-of-bounds reads to memory [1] and out-of-bounds\nwrites to device registers.\n\nBefore commit 43a3d9ba34c9 (\"i40evf: Allow PF driver to configure RSS\"),\nthe loop upper bounds were:\n i <= I40E_VFQF_{HKEY,HLUT}_MAX_INDEX\nwhich is safe since the value is the last valid index.\n\nThat commit changed the bounds to:\n i <= adapter->rss_{key,lut}_size / 4\nwhere `rss_{key,lut}_size / 4` is the number of dwords, so the last\nvalid index is `(rss_{key,lut}_size / 4) - 1`. Therefore, using `<=`\naccesses one element past the end.\n\nFix the issues by using `<` instead of `<=`, ensuring we do not exceed\nthe bounds.\n\n[1] KASAN splat about rss_key_size off-by-one\n BUG: KASAN: slab-out-of-bounds in iavf_config_rss+0x619/0x800\n Read of size 4 at addr ffff888102c50134 by task kworker/u8:6/63\n\n CPU: 0 UID: 0 PID: 63 Comm: kworker/u8:6 Not tainted 6.18.0-rc2-enjuk-tnguy-00378-g3005f5b77652-dirty #156 PREEMPT(voluntary)\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n Workqueue: iavf iavf_watchdog_task\n Call Trace:\n <TASK>\n dump_stack_lvl+0x6f/0xb0\n print_report+0x170/0x4f3\n kasan_report+0xe1/0x1a0\n iavf_config_rss+0x619/0x800\n iavf_watchdog_task+0x2be7/0x3230\n process_one_work+0x7fd/0x1420\n worker_thread+0x4d1/0xd40\n kthread+0x344/0x660\n ret_from_fork+0x249/0x320\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n\n Allocated by task 63:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x7f/0x90\n __kmalloc_noprof+0x246/0x6f0\n iavf_watchdog_task+0x28fc/0x3230\n process_one_work+0x7fd/0x1420\n worker_thread+0x4d1/0xd40\n kthread+0x344/0x660\n ret_from_fork+0x249/0x320\n ret_from_fork_asm+0x1a/0x30\n\n The buggy address belongs to the object at ffff888102c50100\n which belongs to the cache kmalloc-64 of size 64\n The buggy address is located 0 bytes to the right of\n allocated 52-byte region [ffff888102c50100, ffff888102c50134)\n\n The buggy address belongs to the physical page:\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102c50\n flags: 0x200000000000000(node=0|zone=2)\n page_type: f5(slab)\n raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n ffff888102c50000: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc\n ffff888102c50080: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc\n >ffff888102c50100: 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc fc\n ^\n ffff888102c50180: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc\n ffff888102c50200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niavf: corrige problemas de 'off-by-one' en iavf_config_rss_reg()\n\nExisten errores de 'off-by-one' al configurar la clave hash RSS y la tabla de búsqueda, causando lecturas fuera de límites a la memoria [1] y escrituras fuera de límites a los registros del dispositivo.\n\nAntes del commit 43a3d9ba34c9 ('i40evf: Permitir al controlador PF configurar RSS'), los límites superiores del bucle eran:\n i <= I40E_VFQF_{HKEY,HLUT}_MAX_INDEX\nlo cual es seguro ya que el valor es el último índice válido.\n\nEse commit cambió los límites a:\n i <= adapter->rss_{key,lut}_size / 4\ndonde 'rss_{key,lut}_size / 4' es el número de dwords, por lo que el último índice válido es '(rss_{key,lut}_size / 4) - 1'. Por lo tanto, usar '<=' accede a un elemento más allá del final.\n\nSe corrigen los problemas usando '<' en lugar de '<=', asegurando que no excedemos los límites.\n\n[1] Informe de KASAN sobre el 'off-by-one' de rss_key_size\n ERROR: KASAN: 'slab-out-of-bounds' en iavf_config_rss+0x619/0x800\n Lectura de tamaño 4 en la dirección ffff888102c50134 por la tarea kworker/u8:6/63\n\n CPU: 0 UID: 0 PID: 63 Comm: kworker/u8:6 No contaminado 6.18.0-rc2-enjuk-tnguy-00378-g3005f5b77652-dirty #156 PREEMPT(voluntario)\n Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n Cola de trabajo: iavf iavf_watchdog_task\n Traza de llamadas:\n \n dump_stack_lvl+0x6f/0xb0\n print_report+0x170/0x4f3\n kasan_report+0xe1/0x1a0\n iavf_config_rss+0x619/0x800\n iavf_watchdog_task+0x2be7/0x3230\n process_one_work+0x7fd/0x1420\n worker_thread+0x4d1/0xd40\n kthread+0x344/0x660\n ret_from_fork+0x249/0x320\n ret_from_fork_asm+0x1a/0x30\n \n\n Asignado por la tarea 63:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x7f/0x90\n __kmalloc_noprof+0x246/0x6f0\n iavf_watchdog_task+0x28fc/0x3230\n process_one_work+0x7fd/0x1420\n worker_thread+0x4d1/0xd40\n kthread+0x344/0x660\n ret_from_fork+0x249/0x320\n ret_from_fork_asm+0x1a/0x30\n\n La dirección con error pertenece al objeto en ffff888102c50100\n el cual pertenece a la caché kmalloc-64 de tamaño 64\n La dirección con error está ubicada 0 bytes a la derecha de\n la región asignada de 52 bytes [ffff888102c50100, ffff888102c50134)\n\n La dirección con error pertenece a la página física:\n página: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102c50\n flags: 0x200000000000000(node=0|zone=2)\n page_type: f5(slab)\n raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000\n página volcada porque: kasan: acceso incorrecto detectado\n\n Estado de la memoria alrededor de la dirección con error:\n ffff888102c50000: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc\n ffff888102c50080: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc\n >ffff888102c50100: 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc fc\n ^\n ffff888102c50180: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc\n ffff888102c50200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc"
}
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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},
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},
{
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},
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},
{
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}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-06-10T20:41:36.543195Z",
"id": "CVE-2025-71087",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-193"
}
]
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-125"
}
]
}
],
"configurations": [
{
"nodes": [
{
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