{"id":"CVE-2026-64113","title":"ixgbevf: fix use-after-free in VEPA multicast source pruning","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nixgbevf: fix use-after-free in VEPA multicast source pruning\n\nixgbevf_clean_rx_irq() prunes frames whose source MAC matches the VF's\nown address (VEPA multicast workaro…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb","Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 6ef30384a50a50e4a484cddf341bc27de31aa3de","Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1","Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < add70e2682c0ad3be2a5810bcf1bc13963ba4df9","Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < a244395d8c563ed1bb26c3ef708db6aeeaa08084","Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < dfef79e09ed2f5df975c98547f97f5d7f8982a24","Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < e8768bcbe5cd30c4ea36a22022c9ffaa66903693","Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 5d49b568c188dc77199d8d2b959c91da8cc27cf1","Linux 3.19"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:36:28.876679Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:22.816Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64113","references":[{"url":"https://git.kernel.org/stable/c/3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb"},{"url":"https://git.kernel.org/stable/c/6ef30384a50a50e4a484cddf341bc27de31aa3de"},{"url":"https://git.kernel.org/stable/c/55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1"},{"url":"https://git.kernel.org/stable/c/add70e2682c0ad3be2a5810bcf1bc13963ba4df9"},{"url":"https://git.kernel.org/stable/c/a244395d8c563ed1bb26c3ef708db6aeeaa08084"},{"url":"https://git.kernel.org/stable/c/dfef79e09ed2f5df975c98547f97f5d7f8982a24"},{"url":"https://git.kernel.org/stable/c/e8768bcbe5cd30c4ea36a22022c9ffaa66903693"},{"url":"https://git.kernel.org/stable/c/5d49b568c188dc77199d8d2b959c91da8cc27cf1"}],"tags":["cve.org"],"epss":0.00527,"epssPercentile":0.43407,"ingestedAt":"2026-10-16T17:24:46.805Z","slug":"CVE-2026-64113","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nixgbevf: fix use-after-free in VEPA multicast source pruning\n\nixgbevf_clean_rx_irq() prunes frames whose source MAC matches the VF's\nown address (VEPA multicast workaround) by freeing the skb and\ncontinuing to the next descriptor:\n\n    dev_kfree_skb_irq(skb);\n    continue;\n\nThe skb pointer is declared outside the while loop and persists across\niterations.  Because the continue skips the \"skb = NULL\" reset at the\nbottom of the loop, the next iteration enters the \"else if (skb)\" path\nand calls ixgbevf_add_rx_frag() on the freed skb, dereferencing\nskb_shinfo(skb)->nr_frags - a use-after-free in NAPI softirq context.\n\nThe sibling driver iavf already handles this correctly by nulling the\npointer before continuing.  Apply the same pattern here.\n\nI do not have ixgbevf hardware; the bug was found by static analysis\n(scan_drop_continue_loops.py + semgrep drop_continue_in_loop, multi-tool\ncorroboration with the highest score in the scan).  The UAF was confirmed\nunder KASAN by loading a test module that reproduces the exact code\npattern (alloc skb, kfree_skb, then read skb_shinfo(skb)->nr_frags):\n\n  BUG: KASAN: slab-use-after-free in ixgbevf_uaf_test_init+0x100/0x1000\n  Read of size 8 at addr 000000006163ae78 by task insmod/30\n  freed 208-byte region [000000006163adc0, 000000006163ae90)\n\nQEMU emulates igb (82576) but not ixgbe (82599), and the igbvf VF\ndriver does not include the VEPA source pruning path, so a full\nend-to-end reproduction with emulated hardware was not possible.\n\n## Affected\n\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb`\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 6ef30384a50a50e4a484cddf341bc27de31aa3de`\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1`\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < add70e2682c0ad3be2a5810bcf1bc13963ba4df9`\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < a244395d8c563ed1bb26c3ef708db6aeeaa08084`\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < dfef79e09ed2f5df975c98547f97f5d7f8982a24`\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < e8768bcbe5cd30c4ea36a22022c9ffaa66903693`\n- `Linux >= bad17234ba702a50aeec50ab04724ee58af89607 < 5d49b568c188dc77199d8d2b959c91da8cc27cf1`\n- `Linux 3.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}