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CVE-2025-21980 (GCVE-0-2025-21980)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:47 – Updated: 2026-05-11 21:10
VLAI
Title
sched: address a potential NULL pointer dereference in the GRED scheduler.
Summary
In the Linux kernel, the following vulnerability has been resolved: sched: address a potential NULL pointer dereference in the GRED scheduler. If kzalloc in gred_init returns a NULL pointer, the code follows the error handling path, invoking gred_destroy. This, in turn, calls gred_offload, where memset could receive a NULL pointer as input, potentially leading to a kernel crash. When table->opt is NULL in gred_init(), gred_change_table_def() is not called yet, so it is not necessary to call ->ndo_setup_tc() in gred_offload().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 17:15 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f25c0515c521375154c62c72447869f40218c861 , < d02c9acd68950a444acda18d514e2b41f846cb7f (git)
Affected: f25c0515c521375154c62c72447869f40218c861 , < 0f0a152957d64ce45b4c27c687e7d087e8f45079 (git)
Affected: f25c0515c521375154c62c72447869f40218c861 , < 68896dd50180b38ea552e49a6a00b685321e5769 (git)
Affected: f25c0515c521375154c62c72447869f40218c861 , < 5f996b4f80c2cef1f9c77275055e7fcba44c9199 (git)
Affected: f25c0515c521375154c62c72447869f40218c861 , < 115ef44a98220fddfab37a39a19370497cd718b9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.132 , ≤ 6.1.* (semver)
Unaffected: 6.6.84 , ≤ 6.6.* (semver)
Unaffected: 6.12.20 , ≤ 6.12.* (semver)
Unaffected: 6.13.8 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T19:40:21.123Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-21980\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T17:15:04.741694Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:38:48.494Z\"}}], \"cna\": {\"title\": \"sched: address a potential NULL pointer dereference in the GRED scheduler.\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f25c0515c521375154c62c72447869f40218c861\", \"lessThan\": \"d02c9acd68950a444acda18d514e2b41f846cb7f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f25c0515c521375154c62c72447869f40218c861\", \"lessThan\": \"0f0a152957d64ce45b4c27c687e7d087e8f45079\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f25c0515c521375154c62c72447869f40218c861\", \"lessThan\": \"68896dd50180b38ea552e49a6a00b685321e5769\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f25c0515c521375154c62c72447869f40218c861\", \"lessThan\": \"5f996b4f80c2cef1f9c77275055e7fcba44c9199\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f25c0515c521375154c62c72447869f40218c861\", \"lessThan\": \"115ef44a98220fddfab37a39a19370497cd718b9\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sched/sch_gred.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.132\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/sch_gred.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d02c9acd68950a444acda18d514e2b41f846cb7f\"}, {\"url\": \"https://git.kernel.org/stable/c/0f0a152957d64ce45b4c27c687e7d087e8f45079\"}, {\"url\": \"https://git.kernel.org/stable/c/68896dd50180b38ea552e49a6a00b685321e5769\"}, {\"url\": \"https://git.kernel.org/stable/c/5f996b4f80c2cef1f9c77275055e7fcba44c9199\"}, {\"url\": \"https://git.kernel.org/stable/c/115ef44a98220fddfab37a39a19370497cd718b9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched: address a potential NULL pointer dereference in the GRED scheduler.\\n\\nIf kzalloc in gred_init returns a NULL pointer, the code follows the\\nerror handling path, invoking gred_destroy. This, in turn, calls\\ngred_offload, where memset could receive a NULL pointer as input,\\npotentially leading to a kernel crash.\\n\\nWhen table-\u003eopt is NULL in gred_init(), gred_change_table_def()\\nis not called yet, so it is not necessary to call -\u003endo_setup_tc()\\nin gred_offload().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.132\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.84\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.20\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.8\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"5.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:10:18.630Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21980\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T21:10:18.630Z\", \"dateReserved\": \"2024-12-29T08:45:45.799Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-01T15:47:09.232Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.