gsd-2021-47125
Vulnerability from gsd
Modified
2024-03-05 06:03
Details
In the Linux kernel, the following vulnerability has been resolved:
sch_htb: fix refcount leak in htb_parent_to_leaf_offload
The commit ae81feb7338c ("sch_htb: fix null pointer dereference
on a null new_q") fixes a NULL pointer dereference bug, but it
is not correct.
Because htb_graft_helper properly handles the case when new_q
is NULL, and after the previous patch by skipping this call
which creates an inconsistency : dev_queue->qdisc will still
point to the old qdisc, but cl->parent->leaf.q will point to
the new one (which will be noop_qdisc, because new_q was NULL).
The code is based on an assumption that these two pointers are
the same, so it can lead to refcount leaks.
The correct fix is to add a NULL pointer check to protect
qdisc_refcount_inc inside htb_parent_to_leaf_offload.
Aliases
{
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-47125"
],
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_htb: fix refcount leak in htb_parent_to_leaf_offload\n\nThe commit ae81feb7338c (\"sch_htb: fix null pointer dereference\non a null new_q\") fixes a NULL pointer dereference bug, but it\nis not correct.\n\nBecause htb_graft_helper properly handles the case when new_q\nis NULL, and after the previous patch by skipping this call\nwhich creates an inconsistency : dev_queue-\u003eqdisc will still\npoint to the old qdisc, but cl-\u003eparent-\u003eleaf.q will point to\nthe new one (which will be noop_qdisc, because new_q was NULL).\nThe code is based on an assumption that these two pointers are\nthe same, so it can lead to refcount leaks.\n\nThe correct fix is to add a NULL pointer check to protect\nqdisc_refcount_inc inside htb_parent_to_leaf_offload.",
"id": "GSD-2021-47125",
"modified": "2024-03-05T06:03:55.096372Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
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"ID": "CVE-2021-47125",
"STATE": "PUBLIC"
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"affects": {
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"product_name": "Linux",
"version": {
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{
"version_affected": "\u003c",
"version_name": "ae81feb7338c",
"version_value": "2411c02d0389"
},
{
"version_value": "not down converted",
"x_cve_json_5_version_data": {
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"versions": [
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"version": "5.12"
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{
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"version": "0",
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"status": "unaffected",
"version": "5.12.10",
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{
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"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
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"data_version": "4.0",
"description": {
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{
"lang": "eng",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_htb: fix refcount leak in htb_parent_to_leaf_offload\n\nThe commit ae81feb7338c (\"sch_htb: fix null pointer dereference\non a null new_q\") fixes a NULL pointer dereference bug, but it\nis not correct.\n\nBecause htb_graft_helper properly handles the case when new_q\nis NULL, and after the previous patch by skipping this call\nwhich creates an inconsistency : dev_queue-\u003eqdisc will still\npoint to the old qdisc, but cl-\u003eparent-\u003eleaf.q will point to\nthe new one (which will be noop_qdisc, because new_q was NULL).\nThe code is based on an assumption that these two pointers are\nthe same, so it can lead to refcount leaks.\n\nThe correct fix is to add a NULL pointer check to protect\nqdisc_refcount_inc inside htb_parent_to_leaf_offload."
}
]
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"value": "n/a"
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"name": "https://git.kernel.org/stable/c/2411c02d03892a5057499f8102d0cc1e0f852416",
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"url": "https://git.kernel.org/stable/c/2411c02d03892a5057499f8102d0cc1e0f852416"
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"name": "https://git.kernel.org/stable/c/944d671d5faa0d78980a3da5c0f04960ef1ad893",
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"url": "https://git.kernel.org/stable/c/944d671d5faa0d78980a3da5c0f04960ef1ad893"
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"nvd.nist.gov": {
"cve": {
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_htb: fix refcount leak in htb_parent_to_leaf_offload\n\nThe commit ae81feb7338c (\"sch_htb: fix null pointer dereference\non a null new_q\") fixes a NULL pointer dereference bug, but it\nis not correct.\n\nBecause htb_graft_helper properly handles the case when new_q\nis NULL, and after the previous patch by skipping this call\nwhich creates an inconsistency : dev_queue-\u003eqdisc will still\npoint to the old qdisc, but cl-\u003eparent-\u003eleaf.q will point to\nthe new one (which will be noop_qdisc, because new_q was NULL).\nThe code is based on an assumption that these two pointers are\nthe same, so it can lead to refcount leaks.\n\nThe correct fix is to add a NULL pointer check to protect\nqdisc_refcount_inc inside htb_parent_to_leaf_offload."
}
],
"id": "CVE-2021-47125",
"lastModified": "2024-03-17T22:38:29.433",
"metrics": {},
"published": "2024-03-15T21:15:07.307",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2411c02d03892a5057499f8102d0cc1e0f852416"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/944d671d5faa0d78980a3da5c0f04960ef1ad893"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
}
}
}
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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.
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