GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2022-49651 (GCVE-0-2022-49651)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:23 – Updated: 2026-08-05 08:55
VLAI
Title
srcu: Tighten cleanup_srcu_struct() GP checks
Summary
In the Linux kernel, the following vulnerability has been resolved: srcu: Tighten cleanup_srcu_struct() GP checks Currently, cleanup_srcu_struct() checks for a grace period in progress, but it does not check for a grace period that has not yet started but which might start at any time. Such a situation could result in a use-after-free bug, so this commit adds a check for a grace period that is needed but not yet started to cleanup_srcu_struct().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 18:15 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: da915ad5cf25b5f5d358dd3670c3378d8ae8c03e , < e997dda6502eefbc1032d6b0da7b353c53344b07 (git)
Affected: da915ad5cf25b5f5d358dd3670c3378d8ae8c03e , < 8ed00760203d8018bee042fbfe8e076579be2c2b (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.18.11 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-49651",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T18:15:18.409911Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-27T18:22:31.366Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/rcu/srcutree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e997dda6502eefbc1032d6b0da7b353c53344b07",
              "status": "affected",
              "version": "da915ad5cf25b5f5d358dd3670c3378d8ae8c03e",
              "versionType": "git"
            },
            {
              "lessThan": "8ed00760203d8018bee042fbfe8e076579be2c2b",
              "status": "affected",
              "version": "da915ad5cf25b5f5d358dd3670c3378d8ae8c03e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/rcu/srcutree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "lessThan": "4.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.11",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsrcu: Tighten cleanup_srcu_struct() GP checks\n\nCurrently, cleanup_srcu_struct() checks for a grace period in progress,\nbut it does not check for a grace period that has not yet started but\nwhich might start at any time.  Such a situation could result in a\nuse-after-free bug, so this commit adds a check for a grace period that\nis needed but not yet started to cleanup_srcu_struct()."
        }
      ],
      "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 - cleanup_srcu_struct() is reached via local teardown paths (KVM VM destroy via /dev/kvm, SGX enclave release, HFI1 file close, IPMI user free, module unload), not via remote packet processing.\nAC:L - The UAF is a TOCTOU race between updating srcu_gp_seq_needed and srcu_gp_start; an attacker who can drive concurrent synchronize_srcu/call_srcu and cleanup (e.g., KVM/SGX create-destroy loops) controls both sides and can retry until the window is hit.\nPR:L - Unprivileged users can open /dev/kvm (kvm group) or other user-accessible device nodes and create/destroy objects that init and cleanup dynamic srcu_struct instances; real root or init-namespace CAP_SYS_ADMIN is not required.\nUI:N - Exploitation requires only attacker-controlled syscalls/ioctls on objects they create; no separate victim action is needed.\nS:U - This is a host-kernel UAF enabling privilege escalation within the same kernel authority; it is not a guest-to-host or other cross-boundary escape by itself.\nC:H - Freeing ssp-\u003esda while a grace period may still start yields a use-after-free on per-CPU SRCU state, which can be turned into an arbitrary kernel read primitive.\nI:H - The same UAF on SRCU per-CPU callback/grace-period structures enables heap reuse and arbitrary write / control-flow hijacking in the kernel.\nA:H - Use-after-free of srcu_data during grace-period start or callback processing can oops/panic the kernel even without full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:55:56.162Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e997dda6502eefbc1032d6b0da7b353c53344b07"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ed00760203d8018bee042fbfe8e076579be2c2b"
        }
      ],
      "title": "srcu: Tighten cleanup_srcu_struct() GP checks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49651",
    "datePublished": "2025-02-26T02:23:53.496Z",
    "dateReserved": "2025-02-26T02:21:30.433Z",
    "dateUpdated": "2026-08-05T08:55:56.162Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-49651",
      "date": "2026-09-13",
      "epss": "0.0025",
      "percentile": "0.16358"
    },
    "microsoft_vex": {
      "current_release_date": "2026-03-31T15:08:07.000Z",
      "cve": "CVE-2022-49651",
      "id": "msrc_CVE-2022-49651",
      "initial_release_date": "2025-02-02T00:00:00.000Z",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "srcu: Tighten cleanup_srcu_struct() GP checks",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2022-49651.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49651\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:40.237\",\"lastModified\":\"2026-06-17T05:18:45.300\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsrcu: Tighten cleanup_srcu_struct() GP checks\\n\\nCurrently, cleanup_srcu_struct() checks for a grace period in progress,\\nbut it does not check for a grace period that has not yet started but\\nwhich might start at any time.  Such a situation could result in a\\nuse-after-free bug, so this commit adds a check for a grace period that\\nis needed but not yet started to cleanup_srcu_struct().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: srcu: Reforzar las comprobaciones de GP de cleanup_srcu_struct() Actualmente, cleanup_srcu_struct() comprueba si hay un per\u00edodo de gracia en curso, pero no comprueba si hay un per\u00edodo de gracia que a\u00fan no ha comenzado pero que podr\u00eda comenzar en cualquier momento. Una situaci\u00f3n de este tipo podr\u00eda dar lugar a un error de use-after-free, por lo que esta confirmaci\u00f3n a\u00f1ade una comprobaci\u00f3n de un per\u00edodo de gracia que es necesario pero que a\u00fan no ha comenzado a cleanup_srcu_struct().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/rcu/srcutree.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"da915ad5cf25b5f5d358dd3670c3378d8ae8c03e\",\"lessThan\":\"e997dda6502eefbc1032d6b0da7b353c53344b07\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"da915ad5cf25b5f5d358dd3670c3378d8ae8c03e\",\"lessThan\":\"8ed00760203d8018bee042fbfe8e076579be2c2b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/rcu/srcutree.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.18.11\",\"lessThanOrEqual\":\"5.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-02-27T18:15:18.409911Z\",\"id\":\"CVE-2022-49651\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.18.11\",\"matchCriteriaId\":\"87059C94-C259-4650-B469-625FE475651B\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8ed00760203d8018bee042fbfe8e076579be2c2b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e997dda6502eefbc1032d6b0da7b353c53344b07\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:14:18+00:00",
      "cve": "CVE-2022-49651",
      "id": "CVE-2022-49651",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "201",
      "product_status:known_affected": "70",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: srcu: Tighten cleanup_srcu_struct() GP checks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49651.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-29T02:26:35Z",
      "cve": "CVE-2022-49651",
      "id": "CVE-2022-49651",
      "initial_release_date": "2025-02-27T03:03:33Z",
      "product_status:known_not_affected": "304",
      "product_status:recommended": "27",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49651",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49651.json",
      "version": "29"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49651\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-27T18:15:18.409911Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-27T18:15:19.669Z\"}}], \"cna\": {\"title\": \"srcu: Tighten cleanup_srcu_struct() GP checks\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"e997dda6502eefbc1032d6b0da7b353c53344b07\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"8ed00760203d8018bee042fbfe8e076579be2c2b\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/rcu/srcutree.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.18.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.18.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/rcu/srcutree.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e997dda6502eefbc1032d6b0da7b353c53344b07\"}, {\"url\": \"https://git.kernel.org/stable/c/8ed00760203d8018bee042fbfe8e076579be2c2b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsrcu: Tighten cleanup_srcu_struct() GP checks\\n\\nCurrently, cleanup_srcu_struct() checks for a grace period in progress,\\nbut it does not check for a grace period that has not yet started but\\nwhich might start at any time.  Such a situation could result in a\\nuse-after-free bug, so this commit adds a check for a grace period that\\nis needed but not yet started to cleanup_srcu_struct().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:42:35.988Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49651\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:42:35.988Z\", \"dateReserved\": \"2025-02-26T02:21:30.433Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:23:53.496Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.