Vulnerability-Lookup

CVE-2026-52935 (GCVE-0-2026-52935)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-24 07:14

Title

xfrm: espintcp: do not reuse an in-progress partial send

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.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/6564e9c7af7e1dc7b…
https://git.kernel.org/stable/c/1777ceac4bea5e568…
https://git.kernel.org/stable/c/8c6c691bf062dc075…
https://git.kernel.org/stable/c/aa82a078f70f7ff88…
https://git.kernel.org/stable/c/ba21439302db9a82f…
https://git.kernel.org/stable/c/f9b38a8fbfa07f1de…
https://git.kernel.org/stable/c/37487d55bf3300e3d…
https://git.kernel.org/stable/c/c381039ade2e161ab…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 6564e9c7af7e1dc7bfe7f3093b728abe484d7630 (git) Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 1777ceac4bea5e568a5ad44b7f9bb219c1db21b6 (git) Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3 (git) Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < aa82a078f70f7ff88ba7d1017134e79d1ac140f2 (git) Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < ba21439302db9a82fe4edbed1e38a97271529421 (git) Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990 (git) Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < 37487d55bf3300e3d2c1368da5c2bd3e3834ea4f (git) Affected: e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 , < c381039ade2e161ab08c0eda73c4f8b9a7115928 (git)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/espintcp.c"
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            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "versionStartIncluding": "5.6",
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T07:14:25.988Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2"
        },
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          "url": "https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928"
        }
      ],
      "title": "xfrm: espintcp: do not reuse an in-progress partial send",
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    }
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    "cveId": "CVE-2026-52935",
    "datePublished": "2026-06-24T07:14:25.988Z",
    "dateReserved": "2026-06-09T07:44:35.369Z",
    "dateUpdated": "2026-06-24T07:14:25.988Z",
    "state": "PUBLISHED"
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    }
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}

GHSA-9XWW-VMQG-JH2Q

Vulnerability from github – Published: 2026-06-24 09:30 – Updated: 2026-06-24 09:30

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-52935"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T08:16:23Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-9xww-vmqg-jh2q",
  "modified": "2026-06-24T09:30:48Z",
  "published": "2026-06-24T09:30:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52935"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1777ceac4bea5e568a5ad44b7f9bb219c1db21b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37487d55bf3300e3d2c1368da5c2bd3e3834ea4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6564e9c7af7e1dc7bfe7f3093b728abe484d7630"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa82a078f70f7ff88ba7d1017134e79d1ac140f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba21439302db9a82fe4edbed1e38a97271529421"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c381039ade2e161ab08c0eda73c4f8b9a7115928"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-52935 (GCVE-0-2026-52935)

GHSA-9XWW-VMQG-JH2Q

Tags

Sightings

Nomenclature