{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-68245", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-16T13:41:40.264Z", "datePublished": "2025-12-16T14:21:22.348Z", "dateUpdated": "2025-12-16T14:21:22.348Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-16T14:21:22.348Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: netpoll: fix incorrect refcount handling causing incorrect cleanup\n\ncommit efa95b01da18 (\"netpoll: fix use after free\") incorrectly\nignored the refcount and prematurely set dev->npinfo to NULL during\nnetpoll cleanup, leading to improper behavior and memory leaks.\n\nScenario causing lack of proper cleanup:\n\n1) A netpoll is associated with a NIC (e.g., eth0) and netdev->npinfo is\n allocated, and refcnt = 1\n - Keep in mind that npinfo is shared among all netpoll instances. In\n this case, there is just one.\n\n2) Another netpoll is also associated with the same NIC and\n npinfo->refcnt += 1.\n - Now dev->npinfo->refcnt = 2;\n - There is just one npinfo associated to the netdev.\n\n3) When the first netpolls goes to clean up:\n - The first cleanup succeeds and clears np->dev->npinfo, ignoring\n refcnt.\n - It basically calls `RCU_INIT_POINTER(np->dev->npinfo, NULL);`\n - Set dev->npinfo = NULL, without proper cleanup\n - No ->ndo_netpoll_cleanup() is either called\n\n4) Now the second target tries to clean up\n - The second cleanup fails because np->dev->npinfo is already NULL.\n * In this case, ops->ndo_netpoll_cleanup() was never called, and\n the skb pool is not cleaned as well (for the second netpoll\n instance)\n - This leaks npinfo and skbpool skbs, which is clearly reported by\n kmemleak.\n\nRevert commit efa95b01da18 (\"netpoll: fix use after free\") and adds\nclarifying comments emphasizing that npinfo cleanup should only happen\nonce the refcount reaches zero, ensuring stable and correct netpoll\nbehavior."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/netpoll.c"], "versions": [{"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "8e6a50edad11e3e1426e4c29e7aa6201f3468ac2", "status": "affected", "versionType": "git"}, {"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "9b0bb18b4b9dc017c1825a2c5e763615e34a1593", "status": "affected", "versionType": "git"}, {"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "890472d6fbf062e6de7fdd56642cb305ab79d669", "status": "affected", "versionType": "git"}, {"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "4afd4ebbad52aa146838ec23082ba393e426a2bb", "status": "affected", "versionType": "git"}, {"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "c645693180a98606c430825223d2029315d85e9d", "status": "affected", "versionType": "git"}, {"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "c79a6d9da29219616b118a3adce9a14cd30f9bd0", "status": "affected", "versionType": "git"}, {"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "9a51b5ccd1c79afec1c03a4e1e6688da52597556", "status": "affected", "versionType": "git"}, {"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264", "lessThan": "49c8d2c1f94cc2f4d1a108530d7ba52614b874c2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/netpoll.c"], "versions": [{"version": "3.17", "status": "affected"}, {"version": "0", "lessThan": "3.17", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.302", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.197", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.59", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.9", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "3.17", "versionEndExcluding": "5.4.302"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "5.10.247"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "5.15.197"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.1.159"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.6.117"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.12.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.17.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8e6a50edad11e3e1426e4c29e7aa6201f3468ac2"}, {"url": "https://git.kernel.org/stable/c/9b0bb18b4b9dc017c1825a2c5e763615e34a1593"}, {"url": "https://git.kernel.org/stable/c/890472d6fbf062e6de7fdd56642cb305ab79d669"}, {"url": "https://git.kernel.org/stable/c/4afd4ebbad52aa146838ec23082ba393e426a2bb"}, {"url": "https://git.kernel.org/stable/c/c645693180a98606c430825223d2029315d85e9d"}, {"url": "https://git.kernel.org/stable/c/c79a6d9da29219616b118a3adce9a14cd30f9bd0"}, {"url": "https://git.kernel.org/stable/c/9a51b5ccd1c79afec1c03a4e1e6688da52597556"}, {"url": "https://git.kernel.org/stable/c/49c8d2c1f94cc2f4d1a108530d7ba52614b874c2"}], "title": "net: netpoll: fix incorrect refcount handling causing incorrect cleanup", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: netpoll: fix incorrect refcount handling causing incorrect cleanup\n\ncommit efa95b01da18 (\"netpoll: fix use after free\") incorrectly\nignored the refcount and prematurely set dev->npinfo to NULL during\nnetpoll cleanup, leading to improper behavior and memory leaks.\n\nScenario causing lack of proper cleanup:\n\n1) A netpoll is associated with a NIC (e.g., eth0) and netdev->npinfo is\n allocated, and refcnt = 1\n - Keep in mind that npinfo is shared among all netpoll instances. In\n this case, there is just one.\n\n2) Another netpoll is also associated with the same NIC and\n npinfo->refcnt += 1.\n - Now dev->npinfo->refcnt = 2;\n - There is just one npinfo associated to the netdev.\n\n3) When the first netpolls goes to clean up:\n - The first cleanup succeeds and clears np->dev->npinfo, ignoring\n refcnt.\n - It basically calls `RCU_INIT_POINTER(np->dev->npinfo, NULL);`\n - Set dev->npinfo = NULL, without proper cleanup\n - No ->ndo_netpoll_cleanup() is either called\n\n4) Now the second target tries to clean up\n - The second cleanup fails because np->dev->npinfo is already NULL.\n * In this case, ops->ndo_netpoll_cleanup() was never called, and\n the skb pool is not cleaned as well (for the second netpoll\n instance)\n - This leaks npinfo and skbpool skbs, which is clearly reported by\n kmemleak.\n\nRevert commit efa95b01da18 (\"netpoll: fix use after free\") and adds\nclarifying comments emphasizing that npinfo cleanup should only happen\nonce the refcount reaches zero, ensuring stable and correct netpoll\nbehavior."}], "id": "CVE-2025-68245", "lastModified": "2025-12-16T15:15:53.767", "metrics": {}, "published": "2025-12-16T15:15:53.767", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/49c8d2c1f94cc2f4d1a108530d7ba52614b874c2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4afd4ebbad52aa146838ec23082ba393e426a2bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/890472d6fbf062e6de7fdd56642cb305ab79d669"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e6a50edad11e3e1426e4c29e7aa6201f3468ac2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a51b5ccd1c79afec1c03a4e1e6688da52597556"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9b0bb18b4b9dc017c1825a2c5e763615e34a1593"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c645693180a98606c430825223d2029315d85e9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c79a6d9da29219616b118a3adce9a14cd30f9bd0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}