CVE-2025-21673

{"id": "CVE-2025-21673", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-01-31T12:15:28.463", "references": [{"url": "https://git.kernel.org/stable/c/1ea68070338518a1d31ce71e6abfe1b30001b27a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a2be5f2ba34d0c6d5ef2624b24e3d852561fcd6a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fa2f9906a7b333ba757a7dbae0713d8a5396186e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-415"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double free of TCP_Server_Info::hostname\n\nWhen shutting down the server in cifs_put_tcp_session(), cifsd thread\nmight be reconnecting to multiple DFS targets before it realizes it\nshould exit the loop, so @server->hostname can't be freed as long as\ncifsd thread isn't done. Otherwise the following can happen:\n\n RIP: 0010:__slab_free+0x223/0x3c0\n Code: 5e 41 5f c3 cc cc cc cc 4c 89 de 4c 89 cf 44 89 44 24 08 4c 89\n 1c 24 e8 fb cf 8e 00 44 8b 44 24 08 4c 8b 1c 24 e9 5f fe ff ff <0f>\n 0b 41 f7 45 08 00 0d 21 00 0f 85 2d ff ff ff e9 1f ff ff ff 80\n RSP: 0018:ffffb26180dbfd08 EFLAGS: 00010246\n RAX: ffff8ea34728e510 RBX: ffff8ea34728e500 RCX: 0000000000800068\n RDX: 0000000000800068 RSI: 0000000000000000 RDI: ffff8ea340042400\n RBP: ffffe112041ca380 R08: 0000000000000001 R09: 0000000000000000\n R10: 6170732e31303000 R11: 70726f632e786563 R12: ffff8ea34728e500\n R13: ffff8ea340042400 R14: ffff8ea34728e500 R15: 0000000000800068\n FS: 0000000000000000(0000) GS:ffff8ea66fd80000(0000)\n 000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007ffc25376080 CR3: 000000012a2ba001 CR4:\n PKRU: 55555554\n Call Trace:\n <TASK>\n ? show_trace_log_lvl+0x1c4/0x2df\n ? show_trace_log_lvl+0x1c4/0x2df\n ? __reconnect_target_unlocked+0x3e/0x160 [cifs]\n ? __die_body.cold+0x8/0xd\n ? die+0x2b/0x50\n ? do_trap+0xce/0x120\n ? __slab_free+0x223/0x3c0\n ? do_error_trap+0x65/0x80\n ? __slab_free+0x223/0x3c0\n ? exc_invalid_op+0x4e/0x70\n ? __slab_free+0x223/0x3c0\n ? asm_exc_invalid_op+0x16/0x20\n ? __slab_free+0x223/0x3c0\n ? extract_hostname+0x5c/0xa0 [cifs]\n ? extract_hostname+0x5c/0xa0 [cifs]\n ? __kmalloc+0x4b/0x140\n __reconnect_target_unlocked+0x3e/0x160 [cifs]\n reconnect_dfs_server+0x145/0x430 [cifs]\n cifs_handle_standard+0x1ad/0x1d0 [cifs]\n cifs_demultiplex_thread+0x592/0x730 [cifs]\n ? __pfx_cifs_demultiplex_thread+0x10/0x10 [cifs]\n kthread+0xdd/0x100\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x29/0x50\n </TASK>"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: se corrige la doble liberaci\u00f3n de TCP_Server_Info::hostname Al apagar el servidor en cifs_put_tcp_session(), el hilo cifsd podr\u00eda estar reconect\u00e1ndose a m\u00faltiples objetivos DFS antes de darse cuenta de que deber\u00eda salir del bucle, por lo que @server-&gt;hostname no se puede liberar mientras el hilo cifsd no haya terminado. De lo contrario, puede ocurrir lo siguiente: RIP: 0010:__slab_free+0x223/0x3c0 Code: 5e 41 5f c3 cc cc cc cc 4c 89 de 4c 89 cf 44 89 44 24 08 4c 89 1c 24 e8 fb cf 8e 00 44 8b 44 24 08 4c 8b 1c 24 e9 5f fe ff ff &lt;0f&gt; 0b 41 f7 45 08 00 0d 21 00 0f 85 2d ff ff ff e9 1f ff ff ff 80 RSP: 0018:ffffb26180dbfd08 EFLAGS: 00010246 RAX: ffff8ea34728e510 RBX: ffff8ea34728e500 RCX: 0000000000800068 RDX: 0000000000800068 RSI: 0000000000000000 RDI: ffff8ea340042400 RBP: ffffe112041ca380 R08: 0000000000000001 R09: 0000000000000000 R10: 6170732e31303000 R11: 70726f632e786563 R12: ffff8ea34728e500 R13: ffff8ea340042400 R14: ffff8ea34728e500 R15: 0000000000800068 FS: 0000000000000000(0000) GS:ffff8ea66fd80000(0000) 000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc25376080 CR3: 000000012a2ba001 CR4: PKRU: 55555554 Call Trace: ? show_trace_log_lvl+0x1c4/0x2df ? show_trace_log_lvl+0x1c4/0x2df ? __reconnect_target_unlocked+0x3e/0x160 [cifs] ? __die_body.cold+0x8/0xd ? die+0x2b/0x50 ? do_trap+0xce/0x120 ? __slab_free+0x223/0x3c0 ? do_error_trap+0x65/0x80 ? __slab_free+0x223/0x3c0 ? exc_invalid_op+0x4e/0x70 ? __slab_free+0x223/0x3c0 ? asm_exc_invalid_op+0x16/0x20 ? __slab_free+0x223/0x3c0 ? extract_hostname+0x5c/0xa0 [cifs] ? extract_hostname+0x5c/0xa0 [cifs] ? __kmalloc+0x4b/0x140 __reconnect_target_unlocked+0x3e/0x160 [cifs] reconnect_dfs_server+0x145/0x430 [cifs] cifs_handle_standard+0x1ad/0x1d0 [cifs] cifs_demultiplex_thread+0x592/0x730 [cifs] ? __pfx_cifs_demultiplex_thread+0x10/0x10 [cifs] kthread+0xdd/0x100 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x29/0x50 "}], "lastModified": "2025-02-04T15:33:41.723", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CC24A46F-AAF0-46A3-9255-D235078D50BC", "versionEndExcluding": "5.15", "versionStartIncluding": "5.14.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8FF05FF-1047-4F2A-8C1B-A65DC1A32135", "versionEndExcluding": "6.6.74", "versionStartIncluding": "5.15.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B7D0DBC3-F63C-4396-8A47-6F3D4FA0556E", "versionEndExcluding": "6.12.11", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DE491969-75AE-4A6B-9A58-8FC5AF98798F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "93C0660D-7FB8-4FBA-892A-B064BA71E49E"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "034C36A6-C481-41F3-AE9A-D116E5BE6895"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8AF9DC49-2085-4FFB-A7E3-73DFAFECC7F2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5DFCDFB8-4FD0-465A-9076-D813D78FE51B"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}