CVE-2025-39925

{"id": "CVE-2025-39925", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39925", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-14T17:39:05.628974Z"}}], "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}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "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}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "479d8a2aedcc1db16f14c1a8a9c74b5bdf18b9ac", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "2c88069fac2c792e228e6a4ae71c9b9b5b9a87a6", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "76957b618ce729c3bd1e782fbc9d9991af653925", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "4e154cb5e7681c2910e2dfa09f05e3469e333745", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "da9e8f429139928570407e8f90559b5d46c20262", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "7fcbe5b2c6a4b5407bf2241fdb71e0a390f6ab9a", "versionType": "git"}], "programFiles": ["net/can/j1939/j1939-priv.h", "net/can/j1939/main.c", "net/can/j1939/socket.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.4"}, {"status": "unaffected", "version": "0", "lessThan": "5.4", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.220", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.187", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.156", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.108", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.16.8", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/can/j1939/j1939-priv.h", "net/can/j1939/main.c", "net/can/j1939/socket.c"], "defaultStatus": "affected"}]}], "published": "2025-10-01T08:15:35.857", "references": [{"url": "https://git.kernel.org/stable/c/2c88069fac2c792e228e6a4ae71c9b9b5b9a87a6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/479d8a2aedcc1db16f14c1a8a9c74b5bdf18b9ac", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4e154cb5e7681c2910e2dfa09f05e3469e333745", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/76957b618ce729c3bd1e782fbc9d9991af653925", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7fcbe5b2c6a4b5407bf2241fdb71e0a390f6ab9a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/da9e8f429139928570407e8f90559b5d46c20262", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: implement NETDEV_UNREGISTER notification handler\n\nsyzbot is reporting\n\n unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\nproblem, for j1939 protocol did not have NETDEV_UNREGISTER notification\nhandler for undoing changes made by j1939_sk_bind().\n\nCommit 25fe97cb7620 (\"can: j1939: move j1939_priv_put() into sk_destruct\ncallback\") expects that a call to j1939_priv_put() can be unconditionally\ndelayed until j1939_sk_sock_destruct() is called. But we need to call\nj1939_priv_put() against an extra ref held by j1939_sk_bind() call\n(as a part of undoing changes made by j1939_sk_bind()) as soon as\nNETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct()\nis called via j1939_sk_release()). Otherwise, the extra ref on \"struct\nj1939_priv\" held by j1939_sk_bind() call prevents \"struct net_device\" from\ndropping the usage count to 1; making it impossible for\nunregister_netdevice() to continue.\n\n[mkl: remove space in front of label]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncan: j1939: implementar gestor de notificaci\u00f3n NETDEV_UNREGISTER\n\nsyzbot est\u00e1 reportando\n\n unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\nproblema, porque el protocolo j1939 no ten\u00eda un gestor de notificaci\u00f3n NETDEV_UNREGISTER para deshacer los cambios realizados por j1939_sk_bind().\n\nEl commit 25fe97cb7620 ('can: j1939: mover j1939_priv_put() al callback sk_destruct') espera que una llamada a j1939_priv_put() pueda retrasarse incondicionalmente hasta que se llame a j1939_sk_sock_destruct(). Pero necesitamos llamar a j1939_priv_put() contra una referencia extra mantenida por la llamada a j1939_sk_bind() (como parte de deshacer los cambios realizados por j1939_sk_bind()) tan pronto como se active la notificaci\u00f3n NETDEV_UNREGISTER (es decir, antes de que se llame a j1939_sk_sock_destruct() a trav\u00e9s de j1939_sk_release()). De lo contrario, la referencia extra en 'struct j1939_priv' mantenida por la llamada a j1939_sk_bind() impide que 'struct net_device' reduzca el contador de uso a 1; haciendo imposible que unregister_netdevice() contin\u00fae.\n\n[mkl: remove space in front of label]"}], "lastModified": "2026-10-19T21:10:00.160", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6EFB31B6-1E03-4B23-85D7-3E0CA07C153F", "versionEndExcluding": "6.16.8", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "47E4C5C0-079F-4838-971B-8C503D48FCC2"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}