{"id":"CVE-2026-72157","summary":"net: thunderbolt: Fix frags[] overflow by bounding frame_count","details":"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)-\u003enr_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()-\u003efrags[] 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-\u003efrags overflow in RX path\") and 600dc40554dc\n(\"net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()\").","modified":"2026-08-24T03:47:32.280074423Z","published":"2026-08-15T05:53:26.718Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72157.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052"},{"type":"WEB","url":"https://git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27"},{"type":"WEB","url":"https://git.kernel.org/stable/c/569ba39b2d12995a29dc158e5b4de6e449278f30"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6262f51e09d8dc8b07599a9e4f03bd3989d13fff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f96b3b35c622d565eff2438993e028d280163f5c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72157.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72157"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e"},{"fixed":"f96b3b35c622d565eff2438993e028d280163f5c"},{"fixed":"6262f51e09d8dc8b07599a9e4f03bd3989d13fff"},{"fixed":"569ba39b2d12995a29dc158e5b4de6e449278f30"},{"fixed":"2b3b4e5ff5a58ad32817824b0310e63908b12052"},{"fixed":"e27beb4536cbf1d59e2d8c2840e87d972aba906f"},{"fixed":"e5824d5b841d99a2bcdd4e2c256643293bbc22c1"},{"fixed":"fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3"},{"fixed":"55d9895f89970501fe126d1026b586b04a224c27"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72157.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"5.10.266"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.217"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.184"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72157.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}