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CVE-2026-72157 (GCVE-0-2026-72157)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-23 12:46
VLAI
Title
net: thunderbolt: Fix frags[] overflow by bounding frame_count
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()").
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < f96b3b35c622d565eff2438993e028d280163f5c (git)
Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < 6262f51e09d8dc8b07599a9e4f03bd3989d13fff (git)
Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < 569ba39b2d12995a29dc158e5b4de6e449278f30 (git)
Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < 2b3b4e5ff5a58ad32817824b0310e63908b12052 (git)
Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < e27beb4536cbf1d59e2d8c2840e87d972aba906f (git)
Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < e5824d5b841d99a2bcdd4e2c256643293bbc22c1 (git)
Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3 (git)
Affected: e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e , < 55d9895f89970501fe126d1026b586b04a224c27 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "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()-\u003efrags[], 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."
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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()\\\").\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/thunderbolt/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/thunderbolt/main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/569ba39b2d12995a29dc158e5b4de6e449278f30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6262f51e09d8dc8b07599a9e4f03bd3989d13fff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f96b3b35c622d565eff2438993e028d280163f5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T14:32:24+00:00",
      "cve": "CVE-2026-72157",
      "id": "CVE-2026-72157",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: thunderbolt: Fix frags[] overflow by bounding frame_count",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72157.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.