CVE-2023-52564
Vulnerability from cvelistv5
Published
2024-03-02 21:59
Modified
2024-12-19 08:21
Severity ?
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29346e217b8ab8a52889b88f00b268278d6b7668Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2bff660e0ff349dee84dc4f6f6d10da4497f5b28Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d5c8862932d31a810b6545f7d69ecc124402c6ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9ebPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c61d0b87a7028c2c10faffc524d748334c7b9827Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/29346e217b8ab8a52889b88f00b268278d6b7668Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2bff660e0ff349dee84dc4f6f6d10da4497f5b28Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6d5c8862932d31a810b6545f7d69ecc124402c6ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9ebPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c61d0b87a7028c2c10faffc524d748334c7b9827Patch
Impacted products
Vendor Product Version
Linux Linux Version: 6.5
Show details on NVD website

To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52564\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-02T22:15:48.933\",\"lastModified\":\"2025-01-07T17:34:18.947\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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().\"},{\"lang\":\"es\",\"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().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.190\",\"versionEndExcluding\":\"5.10.198\",\"matchCriteriaId\":\"BB2D8159-4945-414E-BE3E-012D06CDECF4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.124\",\"versionEndExcluding\":\"5.15.134\",\"matchCriteriaId\":\"19F970A2-0C87-43BE-A458-32CE99A8466F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.43\",\"versionEndExcluding\":\"6.1.56\",\"matchCriteriaId\":\"A7A76EF2-AF5B-4071-9E4E-F62A07108496\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.5\",\"versionEndExcluding\":\"6.5.6\",\"matchCriteriaId\":\"37A7D3E0-22DF-4D92-9B5E-F8505D3471A2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"84267A4F-DBC2-444F-B41D-69E15E1BEC97\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"FB440208-241C-4246-9A83-C1715C0DAA6C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"0DC421F1-3D5A-4BEF-BF76-4E468985D20B\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/29346e217b8ab8a52889b88f00b268278d6b7668\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2bff660e0ff349dee84dc4f6f6d10da4497f5b28\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6d5c8862932d31a810b6545f7d69ecc124402c6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c61d0b87a7028c2c10faffc524d748334c7b9827\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/29346e217b8ab8a52889b88f00b268278d6b7668\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2bff660e0ff349dee84dc4f6f6d10da4497f5b28\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6d5c8862932d31a810b6545f7d69ecc124402c6e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a48d2bcd23f2c98d575bc2f9b7a3fbd16aeea9eb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c61d0b87a7028c2c10faffc524d748334c7b9827\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}"
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