CVE-2025-38545 (GCVE-0-2025-38545)
Vulnerability from cvelistv5
Published
2025-08-16 11:22
Modified
2026-08-05 12:02
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ethernet: ti: am65-cpsw-nuss: Fix skb size by accounting for skb_shared_info While transitioning from netdev_alloc_ip_align() to build_skb(), memory for the "skb_shared_info" member of an "skb" was not allocated. Fix this by allocating "PAGE_SIZE" as the skb length, accounting for the packet length, headroom and tailroom, thereby including the required memory space for skb_shared_info.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8acacc40f7337527ff84cd901ed2ef0a2b95b2b6
Version: 8acacc40f7337527ff84cd901ed2ef0a2b95b2b6
Version: 8acacc40f7337527ff84cd901ed2ef0a2b95b2b6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/ti/am65-cpsw-nuss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fc2fffa2facac15ce711e95f98f954426e025bc5",
              "status": "affected",
              "version": "8acacc40f7337527ff84cd901ed2ef0a2b95b2b6",
              "versionType": "git"
            },
            {
              "lessThan": "7d6ca0c8c0caf9a13cae2de763bb1f2a9ea7eabb",
              "status": "affected",
              "version": "8acacc40f7337527ff84cd901ed2ef0a2b95b2b6",
              "versionType": "git"
            },
            {
              "lessThan": "02c4d6c26f1f662da8885b299c224ca6628ad232",
              "status": "affected",
              "version": "8acacc40f7337527ff84cd901ed2ef0a2b95b2b6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/ti/am65-cpsw-nuss.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.39",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.7",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: ti: am65-cpsw-nuss: Fix skb size by accounting for skb_shared_info\n\nWhile transitioning from netdev_alloc_ip_align() to build_skb(), memory\nfor the \"skb_shared_info\" member of an \"skb\" was not allocated. Fix this\nby allocating \"PAGE_SIZE\" as the skb length, accounting for the packet\nlength, headroom and tailroom, thereby including the required memory space\nfor skb_shared_info."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is the am65-cpsw RX NAPI path, entered solely by processing a received Ethernet frame, and the panic threshold (1704 bytes) is below the driver\u0027s supported max_mtu of 2002, so an ordinary routed IP datagram from a remote host triggers it on any port configured with an MTU above ~1690.\nAC:L - The attacker only needs to get a frame larger than 1704 bytes delivered to the interface; the hardware RX_MAXLEN is fixed at 2024 independent of the configured MTU, so even at the default MTU an oversized frame is accepted and DMA\u0027d, and the resulting skb_put() overflow is deterministic with no race or memory-layout dependency.\nPR:N - The crash happens in am65_cpsw_nuss_rx_packets() before eth_type_trans() and any protocol or socket demultiplexing, so no credentials, sockets, or local access of any kind are required \u2014 a broadcast or unicast frame to the port\u0027s MAC suffices.\nUI:N - Packet reception and NAPI polling are entirely automatic; no action by any local or remote user is needed once the interface is up.\nS:U - The BUG() and resulting panic occur in the kernel of the receiving host, affecting only resources managed by that same security authority with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - skb-\u003eend is understated rather than overstated, so no out-of-bounds read occurs \u2014 skb_put()\u0027s bounds check fires before any data past the allocation is touched, and packets at or below 1704 bytes end exactly at the skb_shared_info boundary with no overlap.\nI:N - There is no out-of-bounds write: skb_shared_info and the entire DMA buffer stay within the order-0 page, the page is never in the DMA ring while a live skb references it, and the oversize case aborts at the skb_put() check rather than corrupting adjacent memory.\nA:H - Any frame exceeding 1704 bytes drives skb_put() past skb-\u003eend into skb_over_panic() -\u003e BUG() from softirq context, which on arm64 becomes \"Fatal exception in interrupt\" and panics the machine; it is remotely and repeatably triggerable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:02:47.780Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fc2fffa2facac15ce711e95f98f954426e025bc5"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d6ca0c8c0caf9a13cae2de763bb1f2a9ea7eabb"
        },
        {
          "url": "https://git.kernel.org/stable/c/02c4d6c26f1f662da8885b299c224ca6628ad232"
        }
      ],
      "title": "net: ethernet: ti: am65-cpsw-nuss: Fix skb size by accounting for skb_shared_info",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38545",
    "datePublished": "2025-08-16T11:22:19.459Z",
    "dateReserved": "2025-04-16T04:51:24.024Z",
    "dateUpdated": "2026-08-05T12:02:47.780Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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