CVE-2024-50152 (GCVE-0-2024-50152)

Vulnerability from cvelistv5 – Published: 2024-11-07 09:31 – Updated: 2026-08-05 11:42
VLAI
Title
smb: client: fix possible double free in smb2_set_ea()
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix possible double free in smb2_set_ea() Clang static checker(scan-build) warning： fs/smb/client/smb2ops.c:1304:2: Attempt to free released memory. 1304 | kfree(ea); | ^~~~~~~~~ There is a double free in such case: 'ea is initialized to NULL' -> 'first successful memory allocation for ea' -> 'something failed, goto sea_exit' -> 'first memory release for ea' -> 'goto replay_again' -> 'second goto sea_exit before allocate memory for ea' -> 'second memory release for ea resulted in double free'. Re-initialie 'ea' to NULL near to the replay_again label, it can fix this double free problem.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 433042a91f9373241307725b52de573933ffedbf , < b1813c220b76f60b1727984794377c4aa849d4c1 (git)
Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < c9f758ecf2562dfdd4adf12c22921b5de8366123 (git)
Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < 19ebc1e6cab334a8193398d4152deb76019b5d34 (git)
Affected: 6.6.32 , < 6.6.59 (semver)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.6.59 , ≤ 6.6.* (semver)
Unaffected: 6.11.6 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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              "value": "AV:N - The bug is driven entirely by data from a remote SMB peer over TCP/445 \u2014 the server induces the replay by resetting the connection (`-EAGAIN`) and then returns `STATUS_NO_EAS_ON_FILE`/an oversized `OutputBufferLength` to force the early `sea_exit` on the retry. A compromised file server or an on-path attacker spoofing SMB responses reaches it with no local access.\nAC:L - The malicious server deterministically controls both halves of the sequence \u2014 dropping the TCP connection mid-request and crafting the QUERY_INFO reply on the replay \u2014 needing only two round trips, with no race or memory-layout condition outside its control. Mounted shares see routine xattr traffic from backup, archive, and desktop-metadata tooling.\nPR:N - A malicious or compromised SMB server holds no privileges whatsoever on the victim client, and nothing on the code path checks server trust. Even in a purely local framing, only ordinary write access to a file on the share is needed.\nUI:N - No victim action is required at exploitation time \u2014 the mount is already established via fstab/autofs/systemd, and the setxattr/removexattr that enters `smb2_set_ea()` is generated by ordinary background activity such as `rsync -X`, `cp -a`, `tar --xattrs`, or indexing daemons.\nS:U - The double free corrupts the kernel slab allocator within the same security authority as the vulnerable code; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The second `kfree()` releases a chunk that has almost certainly been reallocated to another live kernel object, producing a use-after-free with two owners; the attacker-chosen allocation size enables grooming into a targeted kmalloc cache and reading back arbitrary kernel data.\nI:H - Double-free/UAF of an attacker-sized slab object is the canonical primitive for heap spraying and controlled overwrite of an adjacent or aliased structure, giving arbitrary write and control-flow hijack potential.\nA:H - Even unexploited, the double free triggers slab freelist corruption or an immediate `BUG()` under `CONFIG_SLAB_FREELIST_HARDENED`, causing a kernel oops/panic that is remotely and repeatably inducible by the server."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix possible double free in smb2_set_ea()\n\nClang static checker(scan-build) warning\uff1a\nfs/smb/client/smb2ops.c:1304:2: Attempt to free released memory.\n 1304 |         kfree(ea);\n      |         ^~~~~~~~~\n\nThere is a double free in such case:\n\u0027ea is initialized to NULL\u0027 -\u003e \u0027first successful memory allocation for\nea\u0027 -\u003e \u0027something failed, goto sea_exit\u0027 -\u003e \u0027first memory release for ea\u0027\n-\u003e \u0027goto replay_again\u0027 -\u003e \u0027second goto sea_exit before allocate memory\nfor ea\u0027 -\u003e \u0027second memory release for ea resulted in double free\u0027.\n\nRe-initialie \u0027ea\u0027 to NULL near to the replay_again label, it can fix this\ndouble free problem."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: se corrige una posible doble liberaci\u00f3n en smb2_set_ea() Advertencia del comprobador est\u00e1tico de Clang (scan-build): fs/smb/client/smb2ops.c:1304:2: Intento de liberar memoria liberada. 1304 | kfree(ea); | ^~~~~~~~~ Hay una doble liberaci\u00f3n en tal caso: \u0027ea se inicializa a NULL\u0027 -\u0026gt; \u0027primera asignaci\u00f3n de memoria exitosa para ea\u0027 -\u0026gt; \u0027algo fall\u00f3, goto sea_exit\u0027 -\u0026gt; \u0027primera liberaci\u00f3n de memoria para ea\u0027 -\u0026gt; \u0027goto replay_again\u0027 -\u0026gt; \u0027segundo goto sea_exit antes de asignar memoria para ea\u0027 -\u0026gt; \u0027la segunda liberaci\u00f3n de memoria para ea result\u00f3 en una doble liberaci\u00f3n\u0027. Reinicialice \u0027ea\u0027 a NULL cerca de la etiqueta replay_again, puede solucionar este problema de doble liberaci\u00f3n."
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        "id": "CVE-2024-50152",
        "lastModified": "2026-08-04T11:21:26.190",
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      "current_release_date": "2026-11-05T13:09:03+00:00",
      "cve": "CVE-2024-50152",
      "id": "CVE-2024-50152",
      "initial_release_date": "2024-11-07T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: fix possible double free in smb2_set_ea()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-50152.json",
      "version": "3"
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  }
}



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