{ "cveId": "CVE-2025-21673", "url": "https://patchblox.com/security/cve/CVE-2025-21673", "summary": "CVE-2025-21673 is fixed in 61 products on 1 platform, first by DEBIAN-CVE-2025-21673, released January 31, 2025. It is not reported as exploited. Patch Radar priority: Routine.", "title": "smb: client: fix double free of TCP_Server_Info::hostname", "description": "In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double free of TCP_Server_Info::hostname When shutting down the server in cifs_put_tcp_session(), cifsd thread might be reconnecting to multiple DFS targets before it realizes it should exit the loop, so @server-\u003Ehostname can\u0027t be freed as long as cifsd thread isn\u0027t done. Otherwise the following can happen: RIP: 0010:__slab_free\u002B0x223/0x3c0 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 \u003C0f\u003E 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: \u003CTASK\u003E ? show_trace_log_lvl\u002B0x1c4/0x2df ? show_trace_log_lvl\u002B0x1c4/0x2df ? __reconnect_target_unlocked\u002B0x3e/0x160 [cifs] ? __die_body.cold\u002B0x8/0xd ? die\u002B0x2b/0x50 ? do_trap\u002B0xce/0x120 ? __slab_free\u002B0x223/0x3c0 ? do_error_trap\u002B0x65/0x80 ? __slab_free\u002B0x223/0x3c0 ? exc_invalid_op\u002B0x4e/0x70 ? __slab_free\u002B0x223/0x3c0 ? asm_exc_invalid_op\u002B0x16/0x20 ? __slab_free\u002B0x223/0x3c0 ? extract_hostname\u002B0x5c/0xa0 [cifs] ? extract_hostname\u002B0x5c/0xa0 [cifs] ? __kmalloc\u002B0x4b/0x140 __reconnect_target_unlocked\u002B0x3e/0x160 [cifs] reconnect_dfs_server\u002B0x145/0x430 [cifs] cifs_handle_standard\u002B0x1ad/0x1d0 [cifs] cifs_demultiplex_thread\u002B0x592/0x730 [cifs] ? __pfx_cifs_demultiplex_thread\u002B0x10/0x10 [cifs] kthread\u002B0xdd/0x100 ? __pfx_kthread\u002B0x10/0x10 ret_from_fork\u002B0x29/0x50 \u003C/TASK\u003E", "published": "2025-01-31T12:15:28Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "cwe": "Double Free", "epss": 0.00421, "epssPercentile": 0.36713, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21673", "fixes": [ { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.42.1", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.42.2", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.6", "fixedVersion": "6.4.0-150600.23.42.2", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-azure", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.8.31.1", "fix": "SUSE-SU-2025:0847-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0847-1", "released": "2025-03-12T13:00:02Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 15.6", "fixedVersion": "6.4.0-150600.8.31.1", "fix": "SUSE-SU-2025:0847-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0847-1", "released": "2025-03-12T13:00:02Z" }, { "platform": "linux", "product": "kernel-coco", "release": "sles 15.6", "fixedVersion": "6.4.0-15061.15.coco15sp6.1", "fix": "SUSE-SU-2025:0564-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0564-1", "released": "2025-02-17T13:26:35Z" }, { "platform": "linux", "product": "kernel-coco_debug", "release": "sles 15.6", "fixedVersion": "6.4.0-15061.15.coco15sp6.1", "fix": "SUSE-SU-2025:0564-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0564-1", "released": "2025-02-17T13:26:35Z" }, { "platform": "linux", "product": "kernel-debug", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.42.2", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-default", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.42.2", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 15.6", "fixedVersion": "6.4.0-150600.23.42.2", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-default-base", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.42.2.150600.12.18.4", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-default-base", "release": "sles 15.6", "fixedVersion": "6.4.0-150600.23.42.2.150600.12.18.4", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-docs", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.42.1", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-docs", "release": "sles 15.6", "fixedVersion": "6.4.0-150600.23.42.1", "fix": "SUSE-SU-2025:0856-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-0856-1", "released": "2025-03-13T15:46:38Z" }, { "platform": "linux", "product": "kernel-kvmsmall", "release": "opensuse-leap 15.6", "fixedVersion": 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}, { "platform": "linux", "product": "kernel-uek-debug-modules", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-modules-core", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-modules-core", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-modules-deprecated", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": 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