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And let md_check_recovery() to register\nsync_thread."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: md: No registre sync_thread para remodelar directamente Actualmente, si se interrumpe el proceso de remodelaci\u00f3n, volver a ensamblar la matriz registrar\u00e1 sync_thread directamente desde pers-&gt;run(), en este caso 'MD_RECOVERY_RUNNING ' se configura directamente, sin embargo, no hay garant\u00eda de que md_do_sync() se ejecute, por lo tanto, stop_sync_thread() se bloquear\u00e1 porque 'MD_RECOVERY_RUNNING' no se puede borrar. En el \u00faltimo parche, aseg\u00farese de que md_do_sync() establezca MD_RECOVERY_DONE; sin embargo, dm-raid test shell/lvconvert-raid-reshape.sh ocasionalmente puede activar el siguiente bloqueo: [root@fedora ~]# cat /proc/1982/stack [&lt;0&gt;] stop_sync_thread+0x1ab/0x270 [md_mod] [&lt;0&gt;] md_frozen_sync_thread+0x5c/0xa0 [md_mod] [&lt;0&gt;] raid_presuspend+0x1e/0x70 [dm_raid] [&lt;0&gt;] dm_table_presuspend_targets+0x40/0xb0 [ dm_mod] [&lt;0&gt;] __dm_destroy+0x2a5/0x310 [dm_mod] [&lt;0&gt;] dm_destroy+0x16/0x30 [dm_mod] [&lt;0&gt;] dev_remove+0x165/0x290 [dm_mod] [&lt;0&gt;] ctl_ioctl+0x4bb/ 0x7b0 [dm_mod] [&lt;0&gt;] dm_ctl_ioctl+0x11/0x20 [dm_mod] [&lt;0&gt;] vfs_ioctl+0x21/0x60 [&lt;0&gt;] __x64_sys_ioctl+0xb9/0xe0 [&lt;0&gt;] do_syscall_64+0xc6/0x230 [&lt;0 &gt;] Entry_SYSCALL_64_after_hwframe+0x6c/0x74 Mientras tanto mddev-&gt;recovery es: MD_RECOVERY_RUNNING | MD_RECOVERY_INTR | MD_RECOVERY_RESHAPE | MD_RECOVERY_FROZEN Solucione este problema eliminando el c\u00f3digo para registrar sync_thread directamente desde raid10 y raid5. Y deje que md_check_recovery() registre sync_thread."}], "id": "CVE-2024-26756", "lastModified": "2025-03-17T16:56:57.017", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-04-03T17:15:52.150", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13b520fb62b772e408f9b79c5fe18ad414e90417"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad39c08186f8a0f221337985036ba86731d6aafe"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13b520fb62b772e408f9b79c5fe18ad414e90417"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad39c08186f8a0f221337985036ba86731d6aafe"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-459"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: md: Don't register sync_thread for reshape directly", "id": "2273211", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273211"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmd: Don't register sync_thread for reshape directly\nCurrently, if reshape is interrupted, then reassemble the array will\nregister sync_thread directly from pers->run(), in this case\n'MD_RECOVERY_RUNNING' is set directly, however, there is no guarantee\nthat md_do_sync() will be executed, hence stop_sync_thread() will hang\nbecause 'MD_RECOVERY_RUNNING' can't be cleared.\nLast patch make sure that md_do_sync() will set MD_RECOVERY_DONE,\nhowever, following hang can still be triggered by dm-raid test\nshell/lvconvert-raid-reshape.sh occasionally:\n[root@fedora ~]# cat /proc/1982/stack\n[<0>] stop_sync_thread+0x1ab/0x270 [md_mod]\n[<0>] md_frozen_sync_thread+0x5c/0xa0 [md_mod]\n[<0>] raid_presuspend+0x1e/0x70 [dm_raid]\n[<0>] dm_table_presuspend_targets+0x40/0xb0 [dm_mod]\n[<0>] __dm_destroy+0x2a5/0x310 [dm_mod]\n[<0>] dm_destroy+0x16/0x30 [dm_mod]\n[<0>] dev_remove+0x165/0x290 [dm_mod]\n[<0>] ctl_ioctl+0x4bb/0x7b0 [dm_mod]\n[<0>] dm_ctl_ioctl+0x11/0x20 [dm_mod]\n[<0>] vfs_ioctl+0x21/0x60\n[<0>] __x64_sys_ioctl+0xb9/0xe0\n[<0>] do_syscall_64+0xc6/0x230\n[<0>] entry_SYSCALL_64_after_hwframe+0x6c/0x74\nMeanwhile mddev->recovery is:\nMD_RECOVERY_RUNNING |\nMD_RECOVERY_INTR |\nMD_RECOVERY_RESHAPE |\nMD_RECOVERY_FROZEN\nFix this problem by remove the code to register sync_thread directly\nfrom raid10 and raid5. And let md_check_recovery() to register\nsync_thread."], "name": "CVE-2024-26756", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26756\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26756\nhttps://lore.kernel.org/linux-cve-announce/2024040303-CVE-2024-26756-135f@gregkh/T"], "statement": "For the Red Hat Enterprise Linux 9 (all versions) the bug already fixed. For older Red Hat Enterprise Linux 8 bug exists, but no plan to fix it, because low severity bug: only system administrator can trigger it (with some commands for Raid control that is MD), and if Raid not being used, then impossible to trigger it. Also triggering the bug leads to \"hang\" (froze) only, so impossible to use it for attack like privileges escalation.", "threat_severity": "Low"}

{}