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CVE-2022-49280 (GCVE-0-2022-49280)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:56 – Updated: 2026-08-05 08:54
VLAI
Title
NFSD: prevent underflow in nfssvc_decode_writeargs()
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: prevent underflow in nfssvc_decode_writeargs() Smatch complains: fs/nfsd/nfsxdr.c:341 nfssvc_decode_writeargs() warn: no lower bound on 'args->len' Change the type to unsigned to prevent this issue.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 19:45 UTC
CWE
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a51b5b737a0be93fae6ea2a18df03ab2359a3f4b , < 614a61e1592051cc42d3c38f899c9f7bdaad8a1d (git)
Affected: a51b5b737a0be93fae6ea2a18df03ab2359a3f4b , < 2764af8ce0bf03cc43ee4a11897cab96bde6caae (git)
Affected: a51b5b737a0be93fae6ea2a18df03ab2359a3f4b , < 413d8fefafe531a9442bb623e3fe292a38f88d65 (git)
Affected: a51b5b737a0be93fae6ea2a18df03ab2359a3f4b , < 184416d4b98509fb4c3d8fc3d6dc1437896cc159 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"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-2022-49280\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:45:22.983376Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-191\", \"description\": \"CWE-191 Integer Underflow (Wrap or Wraparound)\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T16:12:22.042Z\"}}], \"cna\": {\"title\": \"NFSD: prevent underflow in nfssvc_decode_writeargs()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - The bug is in NFSD\u0027s NFSv2 WRITE XDR decoder (nfssvc_decode_writeargs), reached when nfsd processes RPC calls over the network (TCP/UDP 2049); a remote NFS client triggers it by sending a crafted WRITE with an oversized length field.\\nAC:L - The attacker fully controls the WRITE opaque-length field and can reliably choose values such as 0xFFFFFFFF/0xFFFFFFFE/0xFFFFFFFD so the signed max-size check is bypassed and xdr_align_size() wraps to 0, with no conditions outside attacker control.\\nPR:N - Typical nfsd deployments accept AUTH_NULL/AUTH_SYS with IP-based exports, so a remote peer that can reach the service needs no real credentials; the vulnerable decode runs after RPC auth flavor acceptance and before filehandle/export write authorization.\\nUI:N - Exploitation requires only attacker-sent NFSv2 WRITE RPCs; no victim user or administrator action on the server is needed.\\nS:U - Impact stays within the host kernel/nfsd security authority and does not cross a VM, IOMMU, or other separate boundary.\\nC:H - On affected kernels the bypass lets decode succeed with a negative len that becomes ULONG_MAX in nfsd_proc_write, so svc_fill_write_vector walks off rq_arg.pages and reads out-of-bounds kernel memory, enabling disclosure via this memory-safety violation.\\nI:H - The same ULONG_MAX length causes svc_fill_write_vector to write past rq_vec[RPCSVC_MAXPAGES], yielding an out-of-bounds kernel write that can be leveraged for integrity compromise and control-flow hijacking.\\nA:H - Out-of-bounds page/vector walks reliably cause kernel oops/panic or memory corruption crashes in nfsd threads, fully disrupting availability of the NFS server host.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a51b5b737a0be93fae6ea2a18df03ab2359a3f4b\", \"lessThan\": \"614a61e1592051cc42d3c38f899c9f7bdaad8a1d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a51b5b737a0be93fae6ea2a18df03ab2359a3f4b\", \"lessThan\": \"2764af8ce0bf03cc43ee4a11897cab96bde6caae\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a51b5b737a0be93fae6ea2a18df03ab2359a3f4b\", \"lessThan\": \"413d8fefafe531a9442bb623e3fe292a38f88d65\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a51b5b737a0be93fae6ea2a18df03ab2359a3f4b\", \"lessThan\": \"184416d4b98509fb4c3d8fc3d6dc1437896cc159\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfsd/nfsproc.c\", \"fs/nfsd/xdr.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/nfsproc.c\", \"fs/nfsd/xdr.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/614a61e1592051cc42d3c38f899c9f7bdaad8a1d\"}, {\"url\": \"https://git.kernel.org/stable/c/2764af8ce0bf03cc43ee4a11897cab96bde6caae\"}, {\"url\": \"https://git.kernel.org/stable/c/413d8fefafe531a9442bb623e3fe292a38f88d65\"}, {\"url\": \"https://git.kernel.org/stable/c/184416d4b98509fb4c3d8fc3d6dc1437896cc159\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFSD: prevent underflow in nfssvc_decode_writeargs()\\n\\nSmatch complains:\\n\\n\\tfs/nfsd/nfsxdr.c:341 nfssvc_decode_writeargs()\\n\\twarn: no lower bound on \u0027args-\u003elen\u0027\\n\\nChange the type to unsigned to prevent this issue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.33\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"5.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"5.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:54:34.949Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49280\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:54:34.949Z\", \"dateReserved\": \"2025-02-26T01:49:39.298Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T01:56:22.662Z\", \"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.