Vulnerability-Lookup

GSD-2024-26592

Vulnerability from gsd - Updated: 2024-02-20 06:02

Details

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix UAF issue in ksmbd_tcp_new_connection() The race is between the handling of a new TCP connection and its disconnection. It leads to UAF on `struct tcp_transport` in ksmbd_tcp_new_connection() function.

Aliases

CVE-2024-26592

JSON

To clipboard

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CVE-2024-26592 (GCVE-0-2024-26592)

Vulnerability from cvelistv5 – Published: 2024-02-22 16:21 – Updated: 2026-08-05 11:26

Title

ksmbd: fix UAF issue in ksmbd_tcp_new_connection()

Summary

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-02-27 05:00 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root Scorecard

References

5 references

URL	Tags
https://git.kernel.org/stable/c/999daf367b924fdf1…
https://git.kernel.org/stable/c/380965e48e9c32ee4…
https://git.kernel.org/stable/c/24290ba94cd0136e4…
https://git.kernel.org/stable/c/69d54650b751532d1…
https://git.kernel.org/stable/c/38d20c62903d66969…

Impacted products

3 products

Vendor	Product	Version
Linux	Linux	Affected: a848c4f15ab6d5d405dbee7de5da71839b2bf35e , < 999daf367b924fdf14e9d83e034ee0f86bc17ec6 (git) Affected: a848c4f15ab6d5d405dbee7de5da71839b2bf35e , < 380965e48e9c32ee4263c023e1d830ea7e462ed1 (git) Affected: a848c4f15ab6d5d405dbee7de5da71839b2bf35e , < 24290ba94cd0136e417283b0dbf8fcdabcf62111 (git) Affected: a848c4f15ab6d5d405dbee7de5da71839b2bf35e , < 69d54650b751532d1e1613a4fb433e591aeef126 (git) Affected: a848c4f15ab6d5d405dbee7de5da71839b2bf35e , < 38d20c62903d669693a1869aa68c4dd5674e2544 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.149 , ≤ 5.15.* (semver) Unaffected: 6.1.75 , ≤ 6.1.* (semver) Unaffected: 6.6.14 , ≤ 6.6.* (semver) Unaffected: 6.7.2 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix)
linux	linux_kernel	Affected: 5.15 Affected: a848c4f15ab6 , < 999daf367b92 (git) Affected: a848c4f15ab6 , < 380965e48e9c (git) Affected: a848c4f15ab6 , < 24290ba94cd0 (git) Affected: a848c4f15ab6 , < 69d54650b751 (git) Affected: a848c4f15ab6 , < 38d20c62903d (git) cpe:2.3:o:linux:linux_kernel::::::::

Show details on NVD website

JSON

To clipboard

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              "value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP port 445; the vulnerable code is `ksmbd_tcp_new_connection()`, invoked directly from `kernel_accept()` on a remote peer\u0027s TCP connection. No local access to the target is required.\nAC:L - The attacker controls both sides of the race \u2014 connecting spawns the handler kthread, and immediately closing (FIN, or RST via SO_LINGER{1,0}) drives that kthread down the shortest possible path to `free_transport()`/`kfree(t)` while the acceptor still has to perform its stale store. Attempts are unauthenticated, cost one TCP handshake each, and can be repeated thousands of times per second while flooding the single acceptor kthread to force preemption.\nPR:N - The path runs at TCP accept time, before SMB2 NEGOTIATE and SESSION_SETUP and before any NTLMSSP/Kerberos credential is processed; no share, account, or guest access is needed. Merely completing a TCP handshake to port 445 reaches the vulnerable code.\nUI:N - Exploitation requires only that the attacker connect to and disconnect from the ksmbd port; no action by any local user or administrator is involved.\nS:U - The corrupted memory and the resulting code execution are within the kernel\u0027s own security authority \u2014 a standard in-kernel use-after-free with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `struct tcp_transport` lives in the general kmalloc-64 cache, and the attacker can reclaim the slot with sprayed objects (including via parallel connections) before the stale write and readback occur; corrupting a pointer field of a reclaimed victim object yields a read primitive over kernel memory, disclosing credentials, keys, and SMB share data.\nI:H - The bug is a use-after-free *write* \u2014 a live `task_struct *` is stored at a fixed offset 16 into a freed general-purpose slab object, overwriting whatever object reclaims that slot. Corrupting a pointer/list field of a sprayed victim object is a classic route to an arbitrary write and control-flow hijack in ring 0.\nA:H - Even without successful heap grooming, the stale write and subsequent `IS_ERR()` read on freed slab memory corrupt unrelated kernel objects, producing oopses and panics (KASAN reports a slab-use-after-free write). An unauthenticated attacker can retry the connect/disconnect race indefinitely until the machine crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:26:07.571Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/999daf367b924fdf14e9d83e034ee0f86bc17ec6"
        },
        {
          "url": "https://git.kernel.org/stable/c/380965e48e9c32ee4263c023e1d830ea7e462ed1"
        },
        {
          "url": "https://git.kernel.org/stable/c/24290ba94cd0136e417283b0dbf8fcdabcf62111"
        },
        {
          "url": "https://git.kernel.org/stable/c/69d54650b751532d1e1613a4fb433e591aeef126"
        },
        {
          "url": "https://git.kernel.org/stable/c/38d20c62903d669693a1869aa68c4dd5674e2544"
        }
      ],
      "title": "ksmbd: fix UAF issue in ksmbd_tcp_new_connection()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26592",
    "datePublished": "2024-02-22T16:21:44.626Z",
    "dateReserved": "2024-02-19T14:20:24.126Z",
    "dateUpdated": "2026-08-05T11:26:07.571Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GSD-2024-26592

CVE-2024-26592 (GCVE-0-2024-26592)

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