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 · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:50 UTC
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.
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                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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      "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"
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            "title": "CVE Program Container"
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                  "content": {
                    "id": "CVE-2024-26811",
                    "options": [
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                      },
                      {
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                      },
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                      }
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                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:50:30.655244Z",
                    "version": "2.0.3"
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              "product": "Linux",
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                "fs/smb/server/mgmt/share_config.c",
                "fs/smb/server/transport_ipc.c"
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                "fs/smb/server/mgmt/share_config.c",
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                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
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                  "status": "unaffected",
                  "version": "5.15.157",
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                  "status": "unaffected",
                  "version": "6.1.85",
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                  "status": "unaffected",
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                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
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                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
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                {
                  "lang": "en",
                  "value": "AV:N - 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."
                }
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            {
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        "cveId": "CVE-2024-26811",
        "datePublished": "2024-04-08T10:02:18.184Z",
        "dateReserved": "2024-02-19T14:20:24.180Z",
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}



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