CVE-2024-35862 (GCVE-0-2024-35862)

Vulnerability from cvelistv5 – Published: 2024-05-19 08:34 – Updated: 2026-08-05 11:30
VLAI
Title
smb: client: fix potential UAF in smb2_is_network_name_deleted()
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2_is_network_name_deleted() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.
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 15:41 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9e550b085206544bd03a8b1dd58a5414e9508351 , < f9414004798d9742c1af23a1d839fe6a9503751c (git)
Affected: 9e550b085206544bd03a8b1dd58a5414e9508351 , < aa582b33f94453fdeaff1e7d0aa252c505975e01 (git)
Affected: 9e550b085206544bd03a8b1dd58a5414e9508351 , < d919b6ea15ffa56fbafef4a1d92f47aeda9af645 (git)
Affected: 9e550b085206544bd03a8b1dd58a5414e9508351 , < 63981561ffd2d4987807df4126f96a11e18b0c1d (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (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)
guessed Create a notification for this product.
Show details on NVD website
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              "dateUpdated": "2024-08-02T03:21:48.581Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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                "url": "https://git.kernel.org/stable/c/63981561ffd2d4987807df4126f96a11e18b0c1d"
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            "title": "CVE Program Container"
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            "metrics": [
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                "other": {
                  "content": {
                    "id": "CVE-2024-35862",
                    "options": [
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                      },
                      {
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                      },
                      {
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                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:41:27.598442Z",
                    "version": "2.0.3"
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            },
            "title": "CISA ADP Vulnrichment"
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/smb/client/smb2ops.c"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "5.12"
                },
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
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                  "status": "unaffected",
                  "version": "6.1.85",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "6.6.26",
                  "versionType": "semver"
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                  "version": "6.8.5",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
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                      "vulnerable": true
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential UAF in smb2_is_network_name_deleted()\n\nSkip sessions that are being teared down (status == SES_EXITING) to\navoid UAF."
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                "baseSeverity": "CRITICAL",
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                  "value": "AV:N - The vulnerable function is invoked by the CIFS demultiplex thread on every SMB2 response received over TCP/445, keyed entirely on server-supplied fields (`Status` and `Id.SyncId.TreeId`). A malicious SMB server, or an off-path/MITM attacker injecting into an unsigned SMB connection, triggers it purely with network data.\nAC:L - The remote peer controls both sides of the race: it forces the session teardown (failed reconnect/session setup drives `__cifs_put_smb_ses()`), and it holds the SES_EXITING window open for the full request timeout simply by not answering the SMB2 LOGOFF, while flooding STATUS_NETWORK_NAME_DELETED responses. The attempt is freely repeatable with no attacker-uncontrollable precondition.\nPR:N - The attacker is the remote SMB peer and needs no credentials or privileges on the target Linux client; the code path runs in the kernel demux thread before any signature validation of the response.\nUI:N - The attack works against an already-established mount \u2014 an fstab/autofs/systemd-automount or DFS-referral connection, or a file server compromised or MITM\u0027d after mount \u2014 and the server itself induces the session teardown, so no victim action is required.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free on `cifs_tcon`/`cifs_ses` gives an attacker-influenced read of freed slab contents, and `pr_warn_once(\"%s\", tcon-\u003etree_name)` walks freed heap memory into the kernel log, leaking whatever now occupies that object.\nI:H - The path writes into freed memory \u2014 `spin_lock(\u0026tcon-\u003etc_lock)` plus `tcon-\u003eneed_reconnect = true` \u2014 on an object the remote attacker selects via the controlled TreeId, giving a heap-spray-able corruption primitive leveragable for control-flow hijack.\nA:H - Dereferencing the poisoned/freed session and tcon produces a general protection fault or KASAN oops in the cifsd kernel thread (as shown in the sibling fix\u0027s trace), crashing or hanging the client with the mount unusable."
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "title": "smb: client: fix potential UAF in smb2_is_network_name_deleted()",
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35862",
        "datePublished": "2024-05-19T08:34:21.173Z",
        "dateReserved": "2024-05-17T13:50:33.107Z",
        "dateUpdated": "2026-08-05T11:30:26.161Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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