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CVE-2024-26980 (GCVE-0-2024-26980)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:26 – Updated: 2026-08-05 11:28
VLAI
Title
ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf If ->ProtocolId is SMB2_TRANSFORM_PROTO_NUM, smb2 request size validation could be skipped. if request size is smaller than sizeof(struct smb2_query_info_req), slab-out-of-bounds read can happen in smb2_allocate_rsp_buf(). This patch allocate response buffer after decrypting transform request. smb3_decrypt_req() will validate transform request size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 2024-06-06 18:49 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < da21401372607c49972ea87a6edaafb36a17c325 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < b80ba648714e6d790d69610cf14656be222d0248 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 3160d9734453a40db248487f8204830879c207f1 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 0977f89722eceba165700ea384f075143f012085 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < c119f4ede3fa90a9463f50831761c28f989bfb20 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.159 , ≤ 5.15.* (semver)
Unaffected: 6.1.88 , ≤ 6.1.* (semver)
Unaffected: 6.6.29 , ≤ 6.6.* (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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This patch allocate response buffer after\\ndecrypting transform request. smb3_decrypt_req() will validate transform\\nrequest size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ksmbd: corrige slab-out-of-bounds en smb2_allocate_rsp_buf Si -\u0026gt;ProtocolId es SMB2_TRANSFORM_PROTO_NUM, se podr\u00eda omitir la validaci\u00f3n del tama\u00f1o de la solicitud smb2. Si el tama\u00f1o de la solicitud es menor que sizeof (struct smb2_query_info_req), la lectura de losa fuera de los l\u00edmites puede ocurrir en smb2_allocate_rsp_buf(). Este parche asigna un b\u00fafer de respuesta despu\u00e9s de descifrar la solicitud de transformaci\u00f3n. smb3_decrypt_req() validar\u00e1 el tama\u00f1o de la solicitud de transformaci\u00f3n y evitar\u00e1 la losa fuera de los l\u00edmites en 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:09:17+00:00",
      "cve": "CVE-2024-26980",
      "id": "CVE-2024-26980",
      "initial_release_date": "2024-05-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26980.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T02:42:19Z",
      "cve": "CVE-2024-26980",
      "id": "CVE-2024-26980",
      "initial_release_date": "2024-05-03T02:09:44Z",
      "product_status:known_affected": "4",
      "product_status:known_not_affected": "489",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26980",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26980.json",
      "version": "45"
    },
    "vulnrichment": {
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No local access to the target is required.\\nAC:L - A single hand-crafted 41-byte packet suffices \\u2014 the attacker deterministically sets ProtocolId to SMB2_TRANSFORM_PROTO_NUM and places 0x0010 (SMB2_QUERY_INFO) in the Signature bytes that alias smb2_hdr-\u003eCommand, with no race, no memory-layout luck, and no condition outside the attacker\u0027s control.\\nPR:N - smb2_allocate_rsp_buf() runs in __handle_ksmbd_work() before decrypt_req(), init_rsp_hdr(), check_user_session() and ksmbd_verify_smb_message(), so the very first packet on a fresh TCP connection reaches it with no NEGOTIATE, session setup, or credentials of any kind.\\nUI:N - The attacker\u0027s own TCP connection to port 445 drives the entire sequence; no administrator or local user on the target has to take any action.\\nS:U - The out-of-bounds slab read and any resulting fault occur entirely within the kernel\u0027s own security authority, crossing no VM, IOMMU, or sandbox boundary.\\nC:L - Two bytes of adjacent slab memory are read past the undersized request_buf and steer the response-buffer size (448 vs 448 + max_trans_size), which is observable to the remote attacker only as an allocation/timing oracle; the bytes themselves are never returned in the SMB response, so disclosure is limited rather than total.\\nI:N - The defect is purely a read of InfoType/FileInfoClass \\u2014 nothing is written out of bounds and no kernel state is corrupted on this path.\\nA:H - The read crosses the slab object boundary and faults or reports on KASAN, KFENCE and MTE-instrumented kernels, panicking the box under panic_on_warn=1 or kasan.fault=panic, and an unauthenticated remote attacker can retrigger it from new connections at unlimited rate.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"da21401372607c49972ea87a6edaafb36a17c325\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"b80ba648714e6d790d69610cf14656be222d0248\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"3160d9734453a40db248487f8204830879c207f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"0977f89722eceba165700ea384f075143f012085\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"c119f4ede3fa90a9463f50831761c28f989bfb20\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/smb/server/server.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.159\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.88\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.29\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/smb/server/server.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/da21401372607c49972ea87a6edaafb36a17c325\"}, {\"url\": \"https://git.kernel.org/stable/c/b80ba648714e6d790d69610cf14656be222d0248\"}, {\"url\": \"https://git.kernel.org/stable/c/3160d9734453a40db248487f8204830879c207f1\"}, {\"url\": \"https://git.kernel.org/stable/c/0977f89722eceba165700ea384f075143f012085\"}, {\"url\": \"https://git.kernel.org/stable/c/c119f4ede3fa90a9463f50831761c28f989bfb20\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf\\n\\nIf -\u003eProtocolId is SMB2_TRANSFORM_PROTO_NUM, smb2 request size\\nvalidation could be skipped. if request size is smaller than\\nsizeof(struct smb2_query_info_req), slab-out-of-bounds read can happen in\\nsmb2_allocate_rsp_buf(). This patch allocate response buffer after\\ndecrypting transform request. smb3_decrypt_req() will validate transform\\nrequest size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.159\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.88\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.29\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.8\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:28:49.476Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26980\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:28:49.476Z\", \"dateReserved\": \"2024-02-19T14:20:24.204Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:26:56.744Z\", \"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

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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.