CVE-2023-52564 (GCVE-0-2023-52564)

Vulnerability from cvelistv5 – Published: 2024-03-02 21:59 – Updated: 2026-05-23 15:26
VLAI
Title
Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux"
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux" This reverts commit 9b9c8195f3f0d74a826077fc1c01b9ee74907239. The commit above is reverted as it did not solve the original issue. gsm_cleanup_mux() tries to free up the virtual ttys by calling gsm_dlci_release() for each available DLCI. There, dlci_put() is called to decrease the reference counter for the DLCI via tty_port_put() which finally calls gsm_dlci_free(). This already clears the pointer which is being checked in gsm_cleanup_mux() before calling gsm_dlci_release(). Therefore, it is not necessary to clear this pointer in gsm_cleanup_mux() as done in the reverted commit. The commit introduces a null pointer dereference: <TASK> ? __die+0x1f/0x70 ? page_fault_oops+0x156/0x420 ? search_exception_tables+0x37/0x50 ? fixup_exception+0x21/0x310 ? exc_page_fault+0x69/0x150 ? asm_exc_page_fault+0x26/0x30 ? tty_port_put+0x19/0xa0 gsmtty_cleanup+0x29/0x80 [n_gsm] release_one_tty+0x37/0xe0 process_one_work+0x1e6/0x3e0 worker_thread+0x4c/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe1/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2f/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> The actual issue is that nothing guards dlci_put() from being called multiple times while the tty driver was triggered but did not yet finished calling gsm_dlci_free().
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-07 20:09 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8fc0eabaa73bbd9bd705577071564616da5c8c61 , < 6d5c8862932d31a810b6545f7d69ecc124402c6e (git)
Affected: 5138c228311a863c3cf937b94a3ab4c87f1f70c4 , < a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9eb (git)
Affected: 9615ca54bc138e35353a001e8b5d4824dce72188 , < c61d0b87a7028c2c10faffc524d748334c7b9827 (git)
Affected: 9b9c8195f3f0d74a826077fc1c01b9ee74907239 , < 2bff660e0ff349dee84dc4f6f6d10da4497f5b28 (git)
Affected: 9b9c8195f3f0d74a826077fc1c01b9ee74907239 , < 29346e217b8ab8a52889b88f00b268278d6b7668 (git)
Affected: 74a8d6f50cc90ed0061997db51dfa81a62b0f835 (git)
Affected: 5.10.190 , < 5.10.198 (semver)
Affected: 5.15.124 , < 5.15.134 (semver)
Affected: 6.1.43 , < 6.1.56 (semver)
Affected: 6.4.8 , < 6.5 (semver)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 5.10.198 , ≤ 5.10.* (semver)
Unaffected: 5.15.134 , ≤ 5.15.* (semver)
Unaffected: 6.1.56 , ≤ 6.1.* (semver)
Unaffected: 6.5.6 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: Revertir \"tty: n_gsm: fix UAF in gsm_cleanup_mux\" Esto revierte el commit 9b9c8195f3f0d74a826077fc1c01b9ee74907239. el commit anterior se revierte porque no resolvi\u00f3 el problema original. gsm_cleanup_mux() intenta liberar los ttys virtuales llamando a gsm_dlci_release() para cada DLCI disponible. All\u00ed, se llama a dlci_put() para disminuir el contador de referencia para el DLCI a trav\u00e9s de tty_port_put() que finalmente llama a gsm_dlci_free(). Esto ya borra el puntero que se est\u00e1 verificando en gsm_cleanup_mux() antes de llamar a gsm_dlci_release(). Por lo tanto, no es necesario borrar este puntero en gsm_cleanup_mux() como se hizo en el commit revertida. el commit introduce una desreferencia de puntero nulo:  ? __die+0x1f/0x70 ? page_fault_oops+0x156/0x420? search_exception_tables+0x37/0x50? fixup_exception+0x21/0x310? exc_page_fault+0x69/0x150? asm_exc_page_fault+0x26/0x30? tty_port_put+0x19/0xa0 gsmtty_cleanup+0x29/0x80 [n_gsm] release_one_tty+0x37/0xe0 proceso_one_work+0x1e6/0x3e0 trabajador_thread+0x4c/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe1/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2f/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30  El problema real es que nada protege a dlci_put() de ser llamado varias veces mientras el controlador tty se activ\u00f3 pero a\u00fan no termin\u00f3 de llamar a gsm_dlci_free()."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"tty: n_gsm: fix UAF in gsm_cleanup_mux\"\n\nThis reverts commit 9b9c8195f3f0d74a826077fc1c01b9ee74907239.\n\nThe commit above is reverted as it did not solve the original issue.\n\ngsm_cleanup_mux() tries to free up the virtual ttys by calling\ngsm_dlci_release() for each available DLCI. There, dlci_put() is called to\ndecrease the reference counter for the DLCI via tty_port_put() which\nfinally calls gsm_dlci_free(). This already clears the pointer which is\nbeing checked in gsm_cleanup_mux() before calling gsm_dlci_release().\nTherefore, it is not necessary to clear this pointer in gsm_cleanup_mux()\nas done in the reverted commit. The commit introduces a null pointer\ndereference:\n \u003cTASK\u003e\n ? __die+0x1f/0x70\n ? page_fault_oops+0x156/0x420\n ? search_exception_tables+0x37/0x50\n ? fixup_exception+0x21/0x310\n ? exc_page_fault+0x69/0x150\n ? asm_exc_page_fault+0x26/0x30\n ? tty_port_put+0x19/0xa0\n gsmtty_cleanup+0x29/0x80 [n_gsm]\n release_one_tty+0x37/0xe0\n process_one_work+0x1e6/0x3e0\n worker_thread+0x4c/0x3d0\n ? __pfx_worker_thread+0x10/0x10\n kthread+0xe1/0x110\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2f/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1b/0x30\n \u003c/TASK\u003e\n\nThe actual issue is that nothing guards dlci_put() from being called\nmultiple times while the tty driver was triggered but did not yet finished\ncalling gsm_dlci_free()."
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            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: Revertir \"tty: n_gsm: fix UAF in gsm_cleanup_mux\" Esto revierte el commit 9b9c8195f3f0d74a826077fc1c01b9ee74907239. el commit anterior se revierte porque no resolvi\u00f3 el problema original. gsm_cleanup_mux() intenta liberar los ttys virtuales llamando a gsm_dlci_release() para cada DLCI disponible. All\u00ed, se llama a dlci_put() para disminuir el contador de referencia para el DLCI a trav\u00e9s de tty_port_put() que finalmente llama a gsm_dlci_free(). Esto ya borra el puntero que se est\u00e1 verificando en gsm_cleanup_mux() antes de llamar a gsm_dlci_release(). Por lo tanto, no es necesario borrar este puntero en gsm_cleanup_mux() como se hizo en el commit revertida. el commit introduce una desreferencia de puntero nulo:  ? __die+0x1f/0x70 ? page_fault_oops+0x156/0x420? search_exception_tables+0x37/0x50? fixup_exception+0x21/0x310? exc_page_fault+0x69/0x150? asm_exc_page_fault+0x26/0x30? tty_port_put+0x19/0xa0 gsmtty_cleanup+0x29/0x80 [n_gsm] release_one_tty+0x37/0xe0 proceso_one_work+0x1e6/0x3e0 trabajador_thread+0x4c/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0xe1/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2f/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30  El problema real es que nada protege a dlci_put() de ser llamado varias veces mientras el controlador tty se activ\u00f3 pero a\u00fan no termin\u00f3 de llamar a gsm_dlci_free()."
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                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.198",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.134",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.56",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.5.*",
                  "status": "unaffected",
                  "version": "6.5.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.6",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.198",
                      "versionStartIncluding": "5.10.190",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.134",
                      "versionStartIncluding": "5.15.124",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.56",
                      "versionStartIncluding": "6.1.43",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.5.6",
                      "versionStartIncluding": "6.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6",
                      "versionStartIncluding": "6.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "6.4.8",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"tty: n_gsm: fix UAF in gsm_cleanup_mux\"\n\nThis reverts commit 9b9c8195f3f0d74a826077fc1c01b9ee74907239.\n\nThe commit above is reverted as it did not solve the original issue.\n\ngsm_cleanup_mux() tries to free up the virtual ttys by calling\ngsm_dlci_release() for each available DLCI. There, dlci_put() is called to\ndecrease the reference counter for the DLCI via tty_port_put() which\nfinally calls gsm_dlci_free(). This already clears the pointer which is\nbeing checked in gsm_cleanup_mux() before calling gsm_dlci_release().\nTherefore, it is not necessary to clear this pointer in gsm_cleanup_mux()\nas done in the reverted commit. The commit introduces a null pointer\ndereference:\n \u003cTASK\u003e\n ? __die+0x1f/0x70\n ? page_fault_oops+0x156/0x420\n ? search_exception_tables+0x37/0x50\n ? fixup_exception+0x21/0x310\n ? exc_page_fault+0x69/0x150\n ? asm_exc_page_fault+0x26/0x30\n ? tty_port_put+0x19/0xa0\n gsmtty_cleanup+0x29/0x80 [n_gsm]\n release_one_tty+0x37/0xe0\n process_one_work+0x1e6/0x3e0\n worker_thread+0x4c/0x3d0\n ? __pfx_worker_thread+0x10/0x10\n kthread+0xe1/0x110\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2f/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1b/0x30\n \u003c/TASK\u003e\n\nThe actual issue is that nothing guards dlci_put() from being called\nmultiple times while the tty driver was triggered but did not yet finished\ncalling gsm_dlci_free()."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-23T15:26:08.197Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/6d5c8862932d31a810b6545f7d69ecc124402c6e"
            },
            {
              "url": "https://git.kernel.org/stable/c/a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9eb"
            },
            {
              "url": "https://git.kernel.org/stable/c/c61d0b87a7028c2c10faffc524d748334c7b9827"
            },
            {
              "url": "https://git.kernel.org/stable/c/2bff660e0ff349dee84dc4f6f6d10da4497f5b28"
            },
            {
              "url": "https://git.kernel.org/stable/c/29346e217b8ab8a52889b88f00b268278d6b7668"
            }
          ],
          "title": "Revert \"tty: n_gsm: fix UAF in gsm_cleanup_mux\"",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52564",
        "datePublished": "2024-03-02T21:59:36.867Z",
        "dateReserved": "2024-03-02T21:55:42.567Z",
        "dateUpdated": "2026-05-23T15:26:08.197Z",
        "state": "PUBLISHED"
      },
      "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.

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



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.