CVE-2024-26811 (GCVE-0-2024-26811)

Vulnerability from cvelistv5 – Published: 2024-04-08 10:02 – Updated: 2026-08-05 11:27
VLAI
Title
ksmbd: validate payload size in ipc response
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate payload size in ipc response If installing malicious ksmbd-tools, ksmbd.mountd can return invalid ipc response to ksmbd kernel server. ksmbd should validate payload size of ipc response from ksmbd.mountd to avoid memory overrun or slab-out-of-bounds. This patch validate 3 ipc response that has payload.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 88b7f1143b15b29cccb8392b4f38e75b7bb3e300 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 51a6c2af9d20203ddeeaf73314ba8854b38d01bd (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < a637fabac554270a851033f5ab402ecb90bc479c (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 76af689a45aa44714b46d1a7de4ffdf851ded896 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < a677ebd8ca2f2632ccdecbad7b87641274e15aac (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.157 , ≤ 5.15.* (semver)
Unaffected: 6.1.85 , ≤ 6.1.* (semver)
Unaffected: 6.6.26 , ≤ 6.6.* (semver)
Unaffected: 6.8.5 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:10:49+00:00",
      "cve": "CVE-2024-26811",
      "id": "CVE-2024-26811",
      "initial_release_date": "2024-04-08T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: validate payload size in ipc response",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26811.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T01:00:58Z",
      "cve": "CVE-2024-26811",
      "id": "CVE-2024-26811",
      "initial_release_date": "2024-04-15T23:12:38Z",
      "product_status:known_affected": "4",
      "product_status:known_not_affected": "471",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26811",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26811.json",
      "version": "47"
    },
    "vulnrichment": {
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The vulnerable parsing lives in the in-kernel SMB3 server (fs/smb/server/) and is only entered on behalf of a remote client\u0027s SMB2 SESSION_SETUP, TREE_CONNECT, or DCERPC-over-IPC$ request, and the over-read bytes are copied straight back into the SMB response sent to that client over TCP/445.\\nAC:L - The kernel unconditionally trusts the embedded length fields, so no memory-layout luck is needed; where handle reuse after the 2 s IPC timeout is involved the attacker drives both sides by opening many connections and issuing concurrent requests to stall ksmbd.mountd, which the rubric treats as attacker-created and therefore Low.\\nPR:N - One of the three responses this patch validates (SPNEGO_AUTHEN) is consumed inside ksmbd_krb5_authenticate() during SMB2 SESSION_SETUP, before the client\u0027s credentials are verified, and the over-read blob is written into the response returned to that unauthenticated client; the share-config and IPC$ RPC paths are additionally reachable via guest/anonymous sessions that ksmbd-tools enables by default.\\nUI:N - The attacker triggers the IPC transaction entirely on their own by sending SMB2 requests to the listening server; no local user or administrator has to perform any action.\\nS:U - The out-of-bounds access and its consequences are confined to the kernel that hosts the ksmbd server; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - smb2_read_pipe() memcpys rpc_resp-\u003epayload_sz bytes out of a short slab object and returns them verbatim to the client as SMB2 READ data, and ksmbd_krb5_authenticate() ships spnego_blob_len over-read bytes back in the SESSION_SETUP SecurityBuffer \\u2014 a large, directly exfiltrated kernel heap disclosure.\\nI:H - Because a wrong-type response is accepted and reinterpreted, security-critical state is built from out-of-bounds slab memory: ksmbd_alloc_user() derives the session\u0027s uid/gid/status flags from an OOB login_response, and share-\u003epath is kstrdup\u0027d from bytes past the object, letting the server grant a session under an unintended identity or root a share at an unintended path.\\nA:H - An unvalidated payload_sz drives kvmalloc() of an arbitrary u32 size and a matching memcpy from a much smaller allocation, so the slab-out-of-bounds read readily walks into unmapped memory and oopses the kernel (or trips KASAN/hardened usercopy), killing the SMB service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"88b7f1143b15b29cccb8392b4f38e75b7bb3e300\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"51a6c2af9d20203ddeeaf73314ba8854b38d01bd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"a637fabac554270a851033f5ab402ecb90bc479c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"76af689a45aa44714b46d1a7de4ffdf851ded896\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0626e6641f6b467447c81dd7678a69c66f7746cf\", \"lessThan\": \"a677ebd8ca2f2632ccdecbad7b87641274e15aac\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/smb/server/ksmbd_netlink.h\", \"fs/smb/server/mgmt/share_config.c\", \"fs/smb/server/transport_ipc.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\": \"5.15.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.26\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/smb/server/ksmbd_netlink.h\", \"fs/smb/server/mgmt/share_config.c\", \"fs/smb/server/transport_ipc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/88b7f1143b15b29cccb8392b4f38e75b7bb3e300\"}, {\"url\": \"https://git.kernel.org/stable/c/51a6c2af9d20203ddeeaf73314ba8854b38d01bd\"}, {\"url\": \"https://git.kernel.org/stable/c/a637fabac554270a851033f5ab402ecb90bc479c\"}, {\"url\": \"https://git.kernel.org/stable/c/76af689a45aa44714b46d1a7de4ffdf851ded896\"}, {\"url\": \"https://git.kernel.org/stable/c/a677ebd8ca2f2632ccdecbad7b87641274e15aac\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: validate payload size in ipc response\\n\\nIf installing malicious ksmbd-tools, ksmbd.mountd can return invalid ipc\\nresponse to ksmbd kernel server. ksmbd should validate payload size of\\nipc response from ksmbd.mountd to avoid memory overrun or\\nslab-out-of-bounds. This patch validate 3 ipc response that has payload.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.157\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.85\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.26\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.5\", \"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\": \"2026-08-05T11:27:30.296Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26811\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:27:30.296Z\", \"dateReserved\": \"2024-02-19T14:20:24.180Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-08T10:02:18.184Z\", \"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.