CVE-2026-72157 (GCVE-0-2026-72157)
Vulnerability from cvelistv5
Published
2026-08-15 05:53
Modified
2026-10-16 18:44
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Fix frags[] overflow by bounding frame_count tbnet_poll() assembles a multi-frame ThunderboltIP packet into one skb. The first frame goes into the skb linear area and every further frame is added as a page fragment. skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, hdr_size, frame_size, TBNET_RX_PAGE_SIZE - hdr_size); A packet of frame_count frames therefore ends up with frame_count - 1 fragments. tbnet_check_frame() only bounds the peer supplied frame_count to TBNET_RING_SIZE / 4 (64), which is far above MAX_SKB_FRAGS (17 by default). A peer that sends a packet of 19 or more small frames pushes nr_frags past MAX_SKB_FRAGS, so skb_add_rx_frag() writes past skb_shinfo()->frags[] and corrupts memory after the shared info. Tighten the start of packet bound to MAX_SKB_FRAGS + 1 so a packet can never produce more fragments than frags[] can hold. This matches the recent skb frags overflow fixes in other receive paths, for example f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") and 600dc40554dc ("net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()").
References
Impacted products
Vendor Product Version
Linux Linux Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
Version: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e
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    "datePublished": "2026-08-15T05:53:26.718Z",
    "dateReserved": "2026-08-09T03:40:39.909Z",
    "dateUpdated": "2026-10-16T18:44:59.473Z",
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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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"f96b3b35c622d565eff2438993e028d280163f5c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"6262f51e09d8dc8b07599a9e4f03bd3989d13fff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"569ba39b2d12995a29dc158e5b4de6e449278f30\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"2b3b4e5ff5a58ad32817824b0310e63908b12052\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"e27beb4536cbf1d59e2d8c2840e87d972aba906f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"e5824d5b841d99a2bcdd4e2c256643293bbc22c1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e\", \"lessThan\": \"55d9895f89970501fe126d1026b586b04a224c27\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/thunderbolt/main.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.266\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.217\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.184\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/thunderbolt/main.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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)-\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()\\\").\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.266\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.184\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-23T12:46:55.998Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72157\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:44:59.473Z\", \"dateReserved\": \"2026-08-09T03:40:39.909Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:53:26.718Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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