{"id":"CVE-2026-72157","title":"net: thunderbolt: Fix frags[] overflow by bounding frame_count","summary":"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 sk…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < f96b3b35c622d565eff2438993e028d280163f5c","Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 6262f51e09d8dc8b07599a9e4f03bd3989d13fff","Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 569ba39b2d12995a29dc158e5b4de6e449278f30","Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 2b3b4e5ff5a58ad32817824b0310e63908b12052","Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < e27beb4536cbf1d59e2d8c2840e87d972aba906f","Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < e5824d5b841d99a2bcdd4e2c256643293bbc22c1","Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3","Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 55d9895f89970501fe126d1026b586b04a224c27","Linux 4.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:42:59.492495Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:44:59.473Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72157","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"}],"tags":["cve.org"],"epss":0.00345,"epssPercentile":0.26416,"ingestedAt":"2026-10-16T19:46:24.426Z","slug":"CVE-2026-72157","body":"## Overview\n\nIn 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()\").\n\n## Affected\n\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < f96b3b35c622d565eff2438993e028d280163f5c`\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 6262f51e09d8dc8b07599a9e4f03bd3989d13fff`\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 569ba39b2d12995a29dc158e5b4de6e449278f30`\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 2b3b4e5ff5a58ad32817824b0310e63908b12052`\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < e27beb4536cbf1d59e2d8c2840e87d972aba906f`\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < e5824d5b841d99a2bcdd4e2c256643293bbc22c1`\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3`\n- `Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 55d9895f89970501fe126d1026b586b04a224c27`\n- `Linux 4.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}