{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72157", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.909Z", "datePublished": "2026-08-15T05:53:26.718Z", "dateUpdated": "2026-08-23T12:46:55.998Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:46:55.998Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: thunderbolt: Fix frags[] overflow by bounding frame_count\n\ntbnet_poll() assembles a multi-frame ThunderboltIP packet into one skb. The\nfirst frame goes into the skb linear area and every further frame is added as\na page fragment.\n\n\tskb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,\n\t\t\tpage, hdr_size, frame_size,\n\t\t\tTBNET_RX_PAGE_SIZE - hdr_size);\n\nA packet of frame_count frames therefore ends up with frame_count - 1\nfragments. tbnet_check_frame() only bounds the peer supplied frame_count to\nTBNET_RING_SIZE / 4 (64), which is far above MAX_SKB_FRAGS (17 by default). A\npeer that sends a packet of 19 or more small frames pushes nr_frags past\nMAX_SKB_FRAGS, so skb_add_rx_frag() writes past skb_shinfo()->frags[] and\ncorrupts memory after the shared info.\n\nTighten the start of packet bound to MAX_SKB_FRAGS + 1 so a packet can never\nproduce more fragments than frags[] can hold. This matches the recent skb\nfrags overflow fixes in other receive paths, for example f0813bcd2d9d (\"net:\nwwan: t7xx: fix potential skb->frags overflow in RX path\") and 600dc40554dc\n(\"net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()\")." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The flaw is triggered by malicious ThunderboltIP frames sent from a peer on the same direct Thunderbolt/USB4 link; exploitation is not Internet-routable but is reachable from an adjacent connected host, dock, or peripheral without local syscall access.\nAC:L - An adjacent peer can reliably trigger the overflow by sending a start-of-packet header with frame_count of 19-64 and delivering the matching small frames; no races or attacker-uncontrollable heap layout are required.\nPR:N - The attacker needs no account, capability, or privilege on the victim OS; a malicious Thunderbolt/USB4 peer that completes XDomain ThunderboltIP login can send the crafted RX frames directly over the established DMA path.\nUI:N - Once a ThunderboltIP session is active, which is common with docks, direct laptop-to-laptop links, and shared workstations, triggering the bug requires no further victim action beyond the existing link.\nS:U - Memory corruption occurs in the kernel Thunderbolt network driver during skb reassembly and does not by itself cross a VM, container, or IOMMU security boundary.\nC:H - skb_add_rx_frag() writes past skb_shinfo()->frags[], corrupting adjacent kernel memory; such out-of-bounds skb metadata corruption is reasonably leverageable for information disclosure as well as further exploitation.\nI:H - The overflow is an attacker-controlled out-of-bounds write of skb fragment descriptors beyond MAX_SKB_FRAGS, which can corrupt heap/skb metadata and be developed into arbitrary kernel memory modification or code execution.\nA:H - Corrupting memory past skb_shared_info can cause kernel oopses, panics, or unstable behavior during RX processing, and repeated malicious packets can deny service on affected systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/thunderbolt/main.c" ], "versions": [ { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "f96b3b35c622d565eff2438993e028d280163f5c", "status": "affected", "versionType": "git" }, { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "6262f51e09d8dc8b07599a9e4f03bd3989d13fff", "status": "affected", "versionType": "git" }, { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "569ba39b2d12995a29dc158e5b4de6e449278f30", "status": "affected", "versionType": "git" }, { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "2b3b4e5ff5a58ad32817824b0310e63908b12052", "status": "affected", "versionType": "git" }, { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "e27beb4536cbf1d59e2d8c2840e87d972aba906f", "status": "affected", "versionType": "git" }, { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "e5824d5b841d99a2bcdd4e2c256643293bbc22c1", "status": "affected", "versionType": "git" }, { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3", "status": "affected", "versionType": "git" }, { "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e", "lessThan": "55d9895f89970501fe126d1026b586b04a224c27", "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/thunderbolt/main.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "4.15", "versionEndExcluding": "5.10.266" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f96b3b35c622d565eff2438993e028d280163f5c" }, { "url": "https://git.kernel.org/stable/c/6262f51e09d8dc8b07599a9e4f03bd3989d13fff" }, { "url": "https://git.kernel.org/stable/c/569ba39b2d12995a29dc158e5b4de6e449278f30" }, { "url": "https://git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052" }, { "url": "https://git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f" }, { "url": "https://git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1" }, { "url": "https://git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3" }, { "url": "https://git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27" } ], "title": "net: thunderbolt: Fix frags[] overflow by bounding frame_count", "x_generator": { "engine": "bippy-1.2.0" } } } }