CVE-2026-52935 (GCVE-0-2026-52935)
Vulnerability from cvelistv5
Published
2026-06-24 07:14
Modified
2026-08-05 12:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: espintcp: do not reuse an in-progress partial send espintcp keeps a single in-flight transmit in ctx->partial. Before building a new sk_msg, espintcp_sendmsg() first tries to flush that state through espintcp_push_msgs(). For blocking callers, espintcp_push_msgs() may return success even when the previous partial send is still pending. espintcp_sendmsg() would then reinitialize emsg->skmsg and reuse ctx->partial while the old transfer still owns that state. Do not rebuild the send message when ctx->partial is still in progress. If espintcp_push_msgs() returns with emsg->len still set, fail the new send instead of overwriting the live partial state. This is a memory-safety fix: reusing the live partial-send state can leave a stale offset attached to a new sk_msg and lead to an out-of- bounds read in the send path. tcp_sendmsg_locked() already handles waiting for send buffer memory, so the fix here is just to preserve espintcp's one-message-at-a-time transmit state.
References
Impacted products
Vendor Product Version
Linux Linux Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
Version: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/espintcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/espintcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.6"
            },
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15.210",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
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              "version": "6.6.143",
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            },
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              "status": "unaffected",
              "version": "6.12.94",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
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            },
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              "version": "7.0.13",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.94",
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                },
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                  "versionEndExcluding": "7.1",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: espintcp: do not reuse an in-progress partial send\n\nespintcp keeps a single in-flight transmit in ctx-\u003epartial.\nBefore building a new sk_msg, espintcp_sendmsg() first tries to flush\nthat state through espintcp_push_msgs().\n\nFor blocking callers, espintcp_push_msgs() may return success even when\nthe previous partial send is still pending. espintcp_sendmsg() would\nthen reinitialize emsg-\u003eskmsg and reuse ctx-\u003epartial while the old\ntransfer still owns that state.\n\nDo not rebuild the send message when ctx-\u003epartial is still in progress.\nIf espintcp_push_msgs() returns with emsg-\u003elen still set, fail the new\nsend instead of overwriting the live partial state.\n\nThis is a memory-safety fix: reusing the live partial-send state can\nleave a stale offset attached to a new sk_msg and lead to an out-of-\nbounds read in the send path.\n\ntcp_sendmsg_locked() already handles waiting for send buffer memory, so\nthe fix here is just to preserve espintcp\u0027s one-message-at-a-time\ntransmit state."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached through local socket syscalls: an attacker creates/uses a TCP socket, sets `TCP_ULP` to `espintcp`, and calls send/sendmsg. It is not directly triggerable by unauthenticated network packets alone.\nAC:L - The attacker can create the needed partial-send condition by controlling the TCP peer or receiver behavior and filling the send buffer, then issuing another send. No race or condition outside attacker control is required.\nPR:L - Setting an already-registered TCP ULP does not require CAP_NET_ADMIN, and ordinary local users can create TCP sockets and call setsockopt/sendmsg. XFRM administration is privileged, but it is not required for this lowest-privilege path to `espintcp_sendmsg`.\nUI:N - Exploitation does not require any victim user action after the attacker has local code execution. The attacker directly drives the socket operations.\nS:U - The impact remains within the kernel and its managed resources on the same host. This is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The stale partial-send offset can produce an out-of-bounds read in the TCP send path, potentially exposing kernel memory through transmitted data. Because the read is not strictly bounded to a small fixed disclosure, high confidentiality impact is appropriate.\nI:H - The corrupted espintcp/sk_msg state can build invalid bvec/socket-buffer references and disturb page or send-buffer accounting, which is a plausible kernel memory integrity primitive. Under the required higher-severity rule for uncertainty, this is scored as high integrity impact.\nA:H - The invalid scatterlist/bvec state can lead to kernel warnings, invalid page references, refcount/accounting corruption, or crashes in the send/cleanup path. A local attacker can repeat the trigger, so availability impact is high."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:53.368Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630"
        },
        {
          "url": "https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990"
        },
        {
          "url": "https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928"
        }
      ],
      "title": "xfrm: espintcp: do not reuse an in-progress partial send",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52935",
    "datePublished": "2026-06-24T07:14:25.988Z",
    "dateReserved": "2026-06-09T07:44:35.369Z",
    "dateUpdated": "2026-08-05T12:31:53.368Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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