CVE-2025-68245 (GCVE-0-2025-68245)
Vulnerability from cvelistv5
Published
2025-12-16 14:21
Modified
2025-12-16 14:21
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: netpoll: fix incorrect refcount handling causing incorrect cleanup
commit efa95b01da18 ("netpoll: fix use after free") incorrectly
ignored the refcount and prematurely set dev->npinfo to NULL during
netpoll cleanup, leading to improper behavior and memory leaks.
Scenario causing lack of proper cleanup:
1) A netpoll is associated with a NIC (e.g., eth0) and netdev->npinfo is
allocated, and refcnt = 1
- Keep in mind that npinfo is shared among all netpoll instances. In
this case, there is just one.
2) Another netpoll is also associated with the same NIC and
npinfo->refcnt += 1.
- Now dev->npinfo->refcnt = 2;
- There is just one npinfo associated to the netdev.
3) When the first netpolls goes to clean up:
- The first cleanup succeeds and clears np->dev->npinfo, ignoring
refcnt.
- It basically calls `RCU_INIT_POINTER(np->dev->npinfo, NULL);`
- Set dev->npinfo = NULL, without proper cleanup
- No ->ndo_netpoll_cleanup() is either called
4) Now the second target tries to clean up
- The second cleanup fails because np->dev->npinfo is already NULL.
* In this case, ops->ndo_netpoll_cleanup() was never called, and
the skb pool is not cleaned as well (for the second netpoll
instance)
- This leaks npinfo and skbpool skbs, which is clearly reported by
kmemleak.
Revert commit efa95b01da18 ("netpoll: fix use after free") and adds
clarifying comments emphasizing that npinfo cleanup should only happen
once the refcount reaches zero, ensuring stable and correct netpoll
behavior.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 Version: efa95b01da18ad22af62f6d99a3243f3be8fd264 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/netpoll.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "8e6a50edad11e3e1426e4c29e7aa6201f3468ac2",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
},
{
"lessThan": "9b0bb18b4b9dc017c1825a2c5e763615e34a1593",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
},
{
"lessThan": "890472d6fbf062e6de7fdd56642cb305ab79d669",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
},
{
"lessThan": "4afd4ebbad52aa146838ec23082ba393e426a2bb",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
},
{
"lessThan": "c645693180a98606c430825223d2029315d85e9d",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
},
{
"lessThan": "c79a6d9da29219616b118a3adce9a14cd30f9bd0",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
},
{
"lessThan": "9a51b5ccd1c79afec1c03a4e1e6688da52597556",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
},
{
"lessThan": "49c8d2c1f94cc2f4d1a108530d7ba52614b874c2",
"status": "affected",
"version": "efa95b01da18ad22af62f6d99a3243f3be8fd264",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/netpoll.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.17"
},
{
"lessThan": "3.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.302",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.247",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.197",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.159",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.117",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.59",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.302",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.247",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.197",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.159",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.117",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.59",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.9",
"versionStartIncluding": "3.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
"versionStartIncluding": "3.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003enpinfo 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-\u003enpinfo 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-\u003erefcnt += 1.\n - Now dev-\u003enpinfo-\u003erefcnt = 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-\u003edev-\u003enpinfo, ignoring\n refcnt.\n - It basically calls `RCU_INIT_POINTER(np-\u003edev-\u003enpinfo, NULL);`\n - Set dev-\u003enpinfo = NULL, without proper cleanup\n - No -\u003endo_netpoll_cleanup() is either called\n\n4) Now the second target tries to clean up\n - The second cleanup fails because np-\u003edev-\u003enpinfo is already NULL.\n * In this case, ops-\u003endo_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."
}
],
"providerMetadata": {
"dateUpdated": "2025-12-16T14:21:22.348Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-68245",
"datePublished": "2025-12-16T14:21:22.348Z",
"dateReserved": "2025-12-16T13:41:40.264Z",
"dateUpdated": "2025-12-16T14:21:22.348Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-68245\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T15:15:53.767\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"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-\u003enpinfo 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-\u003enpinfo 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-\u003erefcnt += 1.\\n - Now dev-\u003enpinfo-\u003erefcnt = 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-\u003edev-\u003enpinfo, ignoring\\n refcnt.\\n - It basically calls `RCU_INIT_POINTER(np-\u003edev-\u003enpinfo, NULL);`\\n - Set dev-\u003enpinfo = NULL, without proper cleanup\\n - No -\u003endo_netpoll_cleanup() is either called\\n\\n4) Now the second target tries to clean up\\n - The second cleanup fails because np-\u003edev-\u003enpinfo is already NULL.\\n * In this case, ops-\u003endo_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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…