{"id":"CVE-2025-71087","title":"iavf: fix off-by-one issues in iavf_config_rss_reg()","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < ceb8459df28d22c225a82d74c0f725f2a935d194","Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 5bb18bfd505ca1affbca921462c350095a6c798c","Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < d7369dc8dd7cbf5cee3a22610028d847b6f02982","Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 18de0e41d69d97fab10b91fecf10ae78a5e43232","Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < f36de3045d006e6d9be1be495f2ed88d1721e752","Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 3095228e1320371e143835d0cebeef1a8a754c66","Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 6daa2893f323981c7894c68440823326e93a7d61","Linux 4.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:41:36.543195Z"},"published":"2026-01-13","updated":"2026-10-19","sourceUpdated":"2026-10-19T18:15:11.876Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71087","references":[{"url":"https://git.kernel.org/stable/c/ceb8459df28d22c225a82d74c0f725f2a935d194"},{"url":"https://git.kernel.org/stable/c/5bb18bfd505ca1affbca921462c350095a6c798c"},{"url":"https://git.kernel.org/stable/c/d7369dc8dd7cbf5cee3a22610028d847b6f02982"},{"url":"https://git.kernel.org/stable/c/18de0e41d69d97fab10b91fecf10ae78a5e43232"},{"url":"https://git.kernel.org/stable/c/f36de3045d006e6d9be1be495f2ed88d1721e752"},{"url":"https://git.kernel.org/stable/c/3095228e1320371e143835d0cebeef1a8a754c66"},{"url":"https://git.kernel.org/stable/c/6daa2893f323981c7894c68440823326e93a7d61"}],"tags":["cve.org"],"epss":0.00137,"epssPercentile":0.02764,"ingestedAt":"2026-10-19T18:35:50.138Z","slug":"CVE-2025-71087","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < ceb8459df28d22c225a82d74c0f725f2a935d194`\n- `Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 5bb18bfd505ca1affbca921462c350095a6c798c`\n- `Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < d7369dc8dd7cbf5cee3a22610028d847b6f02982`\n- `Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 18de0e41d69d97fab10b91fecf10ae78a5e43232`\n- `Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < f36de3045d006e6d9be1be495f2ed88d1721e752`\n- `Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 3095228e1320371e143835d0cebeef1a8a754c66`\n- `Linux >= 43a3d9ba34c9ca313573201d3f45de5ab3494cec < 6daa2893f323981c7894c68440823326e93a7d61`\n- `Linux 4.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}