{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64056", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.030Z", "datePublished": "2026-07-19T15:39:37.673Z", "dateUpdated": "2026-08-05T12:38:45.763Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:45.763Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: cortina: Make RX SKB per-port\n\nThe SKB used to assemble packets from fragments in gmac_rx()\nis static local, but the Gemini has two ethernet ports, meaning\nthere can be races between the ports on a bad day if a device\nis using both.\n\nMake the RX SKB a per-port variable and carry it over between\ninvocations in the port struct instead.\n\nZero the pointer once we call napi_gro_frags(), on error (after\ncalling napi_free_frags()) or if the port is stopped.\n\nZero it in some place where not strictly necessary just to\nemphasize what is going on.\n\nThis was found by Sashiko during normal patch review." } ], "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 vulnerable code runs in the netdev RX path (gmac_irq → napi_schedule → gmac_napi_poll → gmac_rx) when Ethernet frames are DMA'd from the wire, so any remote host that can send packets to a reachable Gemini GMAC interface can trigger it.\nAC:L - An attacker controls both sides of the race by flooding one or both GMAC ports with multi-descriptor/jumbo frames to keep skb assembly in progress while concurrent NAPI polls run on the independent per-port IRQ handlers without serialization on the shared static skb pointer.\nPR:N - Exploitation requires only the ability to deliver Ethernet frames to an active interface; there are no authentication gates, capability checks, or local syscalls on the RX path from hardware interrupt through gmac_rx().\nUI:N - Triggering the race requires only crafted or high-volume network traffic; no victim interaction such as mounting a filesystem or opening a file is needed.\nS:U - The corruption is confined to kernel networking state (shared skb assembly between the two GMAC ports on the same host); impact does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - Concurrent corruption of a shared skb and mismatched napi_get_frags/napi_gro_frags/napi_free_frags usage across ports can cause use-after-free and skb metadata corruption that enables arbitrary kernel memory disclosure.\nI:H - Cross-port skb corruption via concurrent skb_fill_page_desc and len updates, plus orphaned or double-freed skb/page state, provides memory corruption primitives that can be leveraged for arbitrary kernel writes or code execution.\nA:H - The race can cause kernel oopses or panics from slab/list corruption, invalid page refcount handling, or crashes inside napi_gro_frags when skb state is corrupted across the two ports." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/cortina/gemini.c" ], "versions": [ { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "27856d533eca3804008695f61c1e4d5ff984196b", "status": "affected", "versionType": "git" }, { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "b6b22824b30e48ce1df3a2e80990f4b8505deb50", "status": "affected", "versionType": "git" }, { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "6bba24e9ebe6f1c0b356cd471e36bdc7fa434897", "status": "affected", "versionType": "git" }, { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "3b249988d774dacf13b203817e971934a42243c4", "status": "affected", "versionType": "git" }, { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "72158ea185b27afae163949b0e86164cb6b64e55", "status": "affected", "versionType": "git" }, { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "cfd62907f3cdbc3b6da8f49ba907c0390018fe5e", "status": "affected", "versionType": "git" }, { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "67a35e7da7ef9d2f000aa758552a128324c604a0", "status": "affected", "versionType": "git" }, { "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88", "lessThan": "06937db21ee311ed07eba47954447245041a982d", "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/cortina/gemini.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "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": "4.16", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/27856d533eca3804008695f61c1e4d5ff984196b" }, { "url": "https://git.kernel.org/stable/c/b6b22824b30e48ce1df3a2e80990f4b8505deb50" }, { "url": "https://git.kernel.org/stable/c/6bba24e9ebe6f1c0b356cd471e36bdc7fa434897" }, { "url": "https://git.kernel.org/stable/c/3b249988d774dacf13b203817e971934a42243c4" }, { "url": "https://git.kernel.org/stable/c/72158ea185b27afae163949b0e86164cb6b64e55" }, { "url": "https://git.kernel.org/stable/c/cfd62907f3cdbc3b6da8f49ba907c0390018fe5e" }, { "url": "https://git.kernel.org/stable/c/67a35e7da7ef9d2f000aa758552a128324c604a0" }, { "url": "https://git.kernel.org/stable/c/06937db21ee311ed07eba47954447245041a982d" } ], "title": "net: ethernet: cortina: Make RX SKB per-port", "x_generator": { "engine": "bippy-1.2.0" } } } }