{"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"}}}}