FKIE_CVE-2026-99056

Vulnerability from fkie_nvd - Published: 2026-10-23 13:17 - Updated: 2026-10-24 14:16
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: strparser: make sure __strp_recv isn't running before tearing down the parser The comment above strp_done() claims that if strp is stopped, strp_recv will no longer be called. That's only true if the caller has a mechanism (eg locking) to guarantee that strp_recv() calls that started before strp_stop() have completed by the time we call strp_done(). This adds a dummy lock_sock/release_sock pair to guarantee that any in-flight strp_recv() (which runs under either bh_lock_sock or lock_sock, depending if it's called from ->sk_data_ready or strp_work) has completed. Only espintcp can be affected by this race condition, but this patch makes sure no future user of strp can have the bug. This could crash on strp->sk ("general mode" of strp), but this mode has been here for 9 years and has never been used. It'll be gone soon, no point worrying about it. Switch the stopped/paused/etc bits to u8's to avoid races between strp_stop() and strp_pause/unpause(). A reproducer has been published and turns the possible UAF into an exploit [1].
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "Documentation/networking/strparser.rst",
            "include/net/strparser.h",
            "net/strparser/strparser.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a18dd388045dc7263d99a07db9de4e0f149ca8f1",
              "status": "affected",
              "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
              "versionType": "git"
            },
            {
              "lessThan": "9f3e9fe1b155e9b4572054d8d140586bc3512ecf",
              "status": "affected",
              "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
              "versionType": "git"
            },
            {
              "lessThan": "d2b5f637b9b67a79a50d42614d10653c13b4e449",
              "status": "affected",
              "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
              "versionType": "git"
            },
            {
              "lessThan": "eaa3a29004c063d7e9d5ea55636f693f67e6db0f",
              "status": "affected",
              "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
              "versionType": "git"
            },
            {
              "lessThan": "0984ebc631792acf8fff105112ee74a6b8f1efcc",
              "status": "affected",
              "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "Documentation/networking/strparser.rst",
            "include/net/strparser.h",
            "net/strparser/strparser.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\nstrparser: make sure __strp_recv isn\u0027t running before tearing down the parser\n\nThe comment above strp_done() claims that if strp is stopped,\nstrp_recv will no longer be called. That\u0027s only true if the caller has\na mechanism (eg locking) to guarantee that strp_recv() calls that\nstarted before strp_stop() have completed by the time we call\nstrp_done().\n\nThis adds a dummy lock_sock/release_sock pair to guarantee that any\nin-flight strp_recv() (which runs under either bh_lock_sock or\nlock_sock, depending if it\u0027s called from -\u003esk_data_ready or strp_work)\nhas completed.\n\nOnly espintcp can be affected by this race condition, but this patch\nmakes sure no future user of strp can have the bug.\n\nThis could crash on strp-\u003esk (\"general mode\" of strp), but this mode\nhas been here for 9 years and has never been used. It\u0027ll be gone soon,\nno point worrying about it.\n\nSwitch the stopped/paused/etc bits to u8\u0027s to avoid races between\nstrp_stop() and strp_pause/unpause().\n\nA reproducer has been published and turns the possible UAF into an\nexploit [1]."
    }
  ],
  "id": "CVE-2026-99056",
  "lastModified": "2026-10-24T14:16:54.200",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-23T13:17:29.257",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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