{ "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" } } } }