FKIE_CVE-2026-90235

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-18 18:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE xprtsock replaces and restores sk->sk_data_ready and sk->sk_write_space on live sockets with plain stores, and xs_udp_do_set_buffer_size() invokes sk->sk_write_space via a plain load. These callback pointers are shared with generic socket and protocol paths that may read or invoke them concurrently, so xprtsock needs the same READ_ONCE()/WRITE_ONCE() callback visibility contract that the validated 4022 family applied elsewhere. When SUNRPC takes over an AF_LOCAL, UDP, or TCP socket and later restores the lower-socket callbacks during teardown, another CPU may still hold an earlier callback snapshot. The plain replace/restore pattern leaves the same visibility hole as the validated 4022 family, so a stale snapshot can still invoke xs_data_ready() or xs_udp_write_space() after the live callback fields have already been restored to the lower-socket handlers. Use WRITE_ONCE() for the shared sk_data_ready and sk_write_space stores in xs_local_finish_connecting(), xs_udp_finish_connecting(), xs_tcp_finish_connecting(), and xs_restore_old_callbacks(). Use READ_ONCE() for the direct sk_write_space invocation in xs_udp_do_set_buffer_size(). This matches the required callback visibility contract while leaving adjacent sk_state_change and sk_error_report handling unchanged.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ed80d009b154aa204f541d390884851b3d4f15ae",
              "status": "affected",
              "version": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
              "versionType": "git"
            },
            {
              "lessThan": "589f761236e05ff9de1bdfd6a5258f113e6457fe",
              "status": "affected",
              "version": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
              "versionType": "git"
            },
            {
              "lessThan": "da652cb17f9faeea1fa44b7215e8869a0b10b664",
              "status": "affected",
              "version": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
              "versionType": "git"
            },
            {
              "lessThan": "d8f0b83753809761a560c4b33249388548ba6e43",
              "status": "affected",
              "version": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
              "versionType": "git"
            },
            {
              "lessThan": "33930840b5f0a79f826e7c69dc6cd78f72a67481",
              "status": "affected",
              "version": "a246b0105bbd9a70a698f69baae2042996f2a0e9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.15"
            },
            {
              "lessThan": "2.6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE\n\nxprtsock replaces and restores sk-\u003esk_data_ready and\nsk-\u003esk_write_space on live sockets with plain stores, and\nxs_udp_do_set_buffer_size() invokes sk-\u003esk_write_space via a plain\nload. These callback pointers are shared with generic socket and\nprotocol paths that may read or invoke them concurrently, so xprtsock\nneeds the same READ_ONCE()/WRITE_ONCE() callback visibility contract\nthat the validated 4022 family applied elsewhere.\n\nWhen SUNRPC takes over an AF_LOCAL, UDP, or TCP socket and later\nrestores the lower-socket callbacks during teardown, another CPU may\nstill hold an earlier callback snapshot. The plain replace/restore\npattern leaves the same visibility hole as the validated 4022 family,\nso a stale snapshot can still invoke xs_data_ready() or\nxs_udp_write_space() after the live callback fields have already been\nrestored to the lower-socket handlers.\n\nUse WRITE_ONCE() for the shared sk_data_ready and sk_write_space\nstores in xs_local_finish_connecting(), xs_udp_finish_connecting(),\nxs_tcp_finish_connecting(), and xs_restore_old_callbacks(). Use\nREAD_ONCE() for the direct sk_write_space invocation in\nxs_udp_do_set_buffer_size(). This matches the required callback\nvisibility contract while leaving adjacent sk_state_change and\nsk_error_report handling unchanged."
    }
  ],
  "id": "CVE-2026-90235",
  "lastModified": "2026-09-18T18:17:48.413",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-17T17:17:19.400",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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