{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64113","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.035Z","datePublished":"2026-07-19T15:40:14.251Z","dateUpdated":"2026-08-05T12:39:22.189Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:39:22.189Z"},"descriptions":[{"lang":"en","value":"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 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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The bug is in the ixgbevf NAPI receive path triggered by incoming Ethernet frames delivered by the VF hardware; per kernel guidance, driver bugs reachable via received packets are scored as Network.\nAC:L - An attacker can reliably trigger the bug by sending a VEPA-reflected multicast/broadcast frame whose source MAC matches the VF address, then immediately sending a follow-on frame so the next loop iteration reuses the freed skb pointer in the same NAPI poll.\nPR:N - Exploitation requires only the ability to inject crafted L2 frames at the VF (e.g., a co-tenant VM on the same VLAN/cloud segment); no local account or capabilities on the victim system are needed.\nUI:N - No victim user action is required; the UAF occurs automatically during softirq packet processing once the crafted frames are received.\nS:U - Impact is kernel memory corruption within the same privilege domain (guest or host kernel running the VF driver), not a cross-VM/host security-boundary escape.\nC:H - The UAF reads freed slab memory via `skb_shinfo(skb)->nr_frags` in `ixgbevf_add_rx_frag()`, which KASAN confirmed and which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF path writes into the freed skb through `skb_add_rx_frag()` (fragment metadata, lengths), enabling heap corruption and potential control-flow hijack.\nA:H - Use-after-free in NAPI softirq context can cause kernel oops/panic during receive processing even without full exploitation."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c"],"versions":[{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb","status":"affected","versionType":"git"},{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"6ef30384a50a50e4a484cddf341bc27de31aa3de","status":"affected","versionType":"git"},{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1","status":"affected","versionType":"git"},{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"add70e2682c0ad3be2a5810bcf1bc13963ba4df9","status":"affected","versionType":"git"},{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"a244395d8c563ed1bb26c3ef708db6aeeaa08084","status":"affected","versionType":"git"},{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"dfef79e09ed2f5df975c98547f97f5d7f8982a24","status":"affected","versionType":"git"},{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"e8768bcbe5cd30c4ea36a22022c9ffaa66903693","status":"affected","versionType":"git"},{"version":"bad17234ba702a50aeec50ab04724ee58af89607","lessThan":"5d49b568c188dc77199d8d2b959c91da8cc27cf1","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c"],"versions":[{"version":"3.19","status":"affected"},{"version":"0","lessThan":"3.19","status":"unaffected","versionType":"semver"},{"version":"5.10.258","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.209","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.175","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.142","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.92","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.34","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.11","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.6.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.12.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.1"}]}]}],"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"}],"title":"ixgbevf: fix use-after-free in VEPA multicast source pruning","x_generator":{"engine":"bippy-1.2.0"}}}}