CVE-2025-21672

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-21672", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.736Z", "datePublished": "2025-01-31T11:25:35.246Z", "dateUpdated": "2026-05-11T21:04:12.853Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:04:12.853Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix merge preference rule failure condition\n\nsyzbot reported a lock held when returning to userspace[1]. This is\nbecause if argc is less than 0 and the function returns directly, the held\ninode lock is not released.\n\nFix this by store the error in ret and jump to done to clean up instead of\nreturning directly.\n\n[dh: Modified Lizhi Xu's original patch to make it honour the error code\nfrom afs_split_string()]\n\n[1]\nWARNING: lock held when returning to user space!\n6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted\n------------------------------------------------\nsyz-executor133/5823 is leaving the kernel with locks still held!\n1 lock held by syz-executor133/5823:\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/afs/addr_prefs.c"], "versions": [{"version": "f94f70d39cc2d54079ebae934862198516315db2", "lessThan": "22be1d90a6211c88dd093b25d1f3aa974d0d9f9d", "status": "affected", "versionType": "git"}, {"version": "f94f70d39cc2d54079ebae934862198516315db2", "lessThan": "17a4fde81d3a7478d97d15304a6d61094a10c2e3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/afs/addr_prefs.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.11", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/22be1d90a6211c88dd093b25d1f3aa974d0d9f9d"}, {"url": "https://git.kernel.org/stable/c/17a4fde81d3a7478d97d15304a6d61094a10c2e3"}], "title": "afs: Fix merge preference rule failure condition", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"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"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-21672", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-01T19:52:11.531644Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-667", "description": "CWE-667 Improper Locking"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:57:12.173Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"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"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-21672", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-01T19:52:11.531644Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-667", "description": "CWE-667 Improper Locking"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T15:58:40.956Z"}}], "cna": {"title": "afs: Fix merge preference rule failure condition", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f94f70d39cc2d54079ebae934862198516315db2", "lessThan": "22be1d90a6211c88dd093b25d1f3aa974d0d9f9d", "versionType": "git"}, {"status": "affected", "version": "f94f70d39cc2d54079ebae934862198516315db2", "lessThan": "17a4fde81d3a7478d97d15304a6d61094a10c2e3", "versionType": "git"}], "programFiles": ["fs/afs/addr_prefs.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"status": "unaffected", "version": "0", "lessThan": "6.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.11", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/afs/addr_prefs.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/22be1d90a6211c88dd093b25d1f3aa974d0d9f9d"}, {"url": "https://git.kernel.org/stable/c/17a4fde81d3a7478d97d15304a6d61094a10c2e3"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix merge preference rule failure condition\n\nsyzbot reported a lock held when returning to userspace[1]. This is\nbecause if argc is less than 0 and the function returns directly, the held\ninode lock is not released.\n\nFix this by store the error in ret and jump to done to clean up instead of\nreturning directly.\n\n[dh: Modified Lizhi Xu's original patch to make it honour the error code\nfrom afs_split_string()]\n\n[1]\nWARNING: lock held when returning to user space!\n6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted\n------------------------------------------------\nsyz-executor133/5823 is leaving the kernel with locks still held!\n1 lock held by syz-executor133/5823:\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.11", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "6.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:18:45.690Z"}}}, "cveMetadata": {"cveId": "CVE-2025-21672", "state": "PUBLISHED", "dateUpdated": "2025-10-01T19:57:12.173Z", "dateReserved": "2024-12-29T08:45:45.736Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-01-31T11:25:35.246Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/afs/addr_prefs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "22be1d90a6211c88dd093b25d1f3aa974d0d9f9d", "status": "affected", "version": "f94f70d39cc2d54079ebae934862198516315db2", "versionType": "git"}, {"lessThan": "17a4fde81d3a7478d97d15304a6d61094a10c2e3", "status": "affected", "version": "f94f70d39cc2d54079ebae934862198516315db2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/afs/addr_prefs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DFD823CF-B7AE-4315-B6BD-3BE57B376574", "versionEndExcluding": "6.12.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*", "matchCriteriaId": "DE491969-75AE-4A6B-9A58-8FC5AF98798F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*", "matchCriteriaId": "93C0660D-7FB8-4FBA-892A-B064BA71E49E", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*", "matchCriteriaId": "034C36A6-C481-41F3-AE9A-D116E5BE6895", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*", "matchCriteriaId": "8AF9DC49-2085-4FFB-A7E3-73DFAFECC7F2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix merge preference rule failure condition\n\nsyzbot reported a lock held when returning to userspace[1]. This is\nbecause if argc is less than 0 and the function returns directly, the held\ninode lock is not released.\n\nFix this by store the error in ret and jump to done to clean up instead of\nreturning directly.\n\n[dh: Modified Lizhi Xu's original patch to make it honour the error code\nfrom afs_split_string()]\n\n[1]\nWARNING: lock held when returning to user space!\n6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted\n------------------------------------------------\nsyz-executor133/5823 is leaving the kernel with locks still held!\n1 lock held by syz-executor133/5823:\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]\n #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: afs: Se corrige la condici\u00f3n de error de la regla de preferencia de fusi\u00f3n. syzbot inform\u00f3 de un bloqueo retenido al volver al espacio de usuario[1]. Esto se debe a que si argc es menor que 0 y la funci\u00f3n retorna directamente, el bloqueo del inodo retenido no se libera. Corrija esto almacenando el error en ret y saltando a done para limpiar en lugar de regresar directamente. [dh: Se modific\u00f3 el parche original de Lizhi Xu para que respete el c\u00f3digo de error de afs_split_string()] [1] ADVERTENCIA: \u00a1bloqueo retenido al volver al espacio de usuario! 6.13.0-rc3-syzkaller-00209-g499551201b5f #0 No contaminado ------------------------------------------------ \u00a1syz-executor133/5823 est\u00e1 abandonando el kernel con bloqueos a\u00fan retenidos! 1 bloqueo mantenido por syz-executor133/5823: #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, en: inode_lock include/linux/fs.h:818 [en l\u00ednea] #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, en: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"}], "id": "CVE-2025-21672", "lastModified": "2026-06-17T08:43:59.103", "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21672", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:52:11.531644Z", "version": "2.0.3"}}]}, "published": "2025-01-31T12:15:28.360", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/17a4fde81d3a7478d97d15304a6d61094a10c2e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22be1d90a6211c88dd093b25d1f3aa974d0d9f9d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-667"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: afs: Fix merge preference rule failure condition", "id": "2343175", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2343175"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nafs: Fix merge preference rule failure condition\nsyzbot reported a lock held when returning to userspace[1]. This is\nbecause if argc is less than 0 and the function returns directly, the held\ninode lock is not released.\nFix this by store the error in ret and jump to done to clean up instead of\nreturning directly.\n[dh: Modified Lizhi Xu's original patch to make it honour the error code\nfrom afs_split_string()]\n[1]\nWARNING: lock held when returning to user space!\n6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted\n------------------------------------------------\nsyz-executor133/5823 is leaving the kernel with locks still held!\n1 lock held by syz-executor133/5823:\n#0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]\n#0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"], "name": "CVE-2025-21672", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-31T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21672\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21672\nhttps://lore.kernel.org/linux-cve-announce/2025013100-CVE-2025-21672-cd35@gregkh/T"], "threat_severity": "Moderate"}

{}