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net: thunderbolt: Fix frags[] overflow by bounding frame_count

Type: advisorySource: Official CVE List1 source record

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()").

Announced Source revision 1
Original source ↗

CVE-2026-72157

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72157

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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",
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        "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"
  }
]
Related CVEs
CVE-2026-72157

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32959 · Revision 1
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Publisher date
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