CVE-2022-49814 (GCVE-0-2022-49814)
Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2025-05-04 08:45
VLAI?
Title
kcm: close race conditions on sk_receive_queue
Summary
In the Linux kernel, the following vulnerability has been resolved:
kcm: close race conditions on sk_receive_queue
sk->sk_receive_queue is protected by skb queue lock, but for KCM
sockets its RX path takes mux->rx_lock to protect more than just
skb queue. However, kcm_recvmsg() still only grabs the skb queue
lock, so race conditions still exist.
We can teach kcm_recvmsg() to grab mux->rx_lock too but this would
introduce a potential performance regression as struct kcm_mux can
be shared by multiple KCM sockets.
So we have to enforce skb queue lock in requeue_rx_msgs() and handle
skb peek case carefully in kcm_wait_data(). Fortunately,
skb_recv_datagram() already handles it nicely and is widely used by
other sockets, we can just switch to skb_recv_datagram() after
getting rid of the unnecessary sock lock in kcm_recvmsg() and
kcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,
so it is safe to get rid of this check too.
I ran the original syzbot reproducer for 30 min without seeing any
issue.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 22f6b5d47396b4287662668ee3f5c1f766cb4259
(git)
Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < d9ad4de92e184b19bcae4da10dac0275abf83931 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < ce57d6474ae999a3b2d442314087473a646a65c7 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 4154b6afa2bd639214ff259d912faad984f7413a (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < bf92e54597d842da127c59833b365d6faeeaf020 (git) Affected: ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 , < 5121197ecc5db58c07da95eb1ff82b98b121a221 (git) |
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{
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"programFiles": [
"net/kcm/kcmsock.c"
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"version": "4.14.300",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "4.19.267",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.225",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.156",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.80",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"version": "6.0.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: close race conditions on sk_receive_queue\n\nsk-\u003esk_receive_queue is protected by skb queue lock, but for KCM\nsockets its RX path takes mux-\u003erx_lock to protect more than just\nskb queue. However, kcm_recvmsg() still only grabs the skb queue\nlock, so race conditions still exist.\n\nWe can teach kcm_recvmsg() to grab mux-\u003erx_lock too but this would\nintroduce a potential performance regression as struct kcm_mux can\nbe shared by multiple KCM sockets.\n\nSo we have to enforce skb queue lock in requeue_rx_msgs() and handle\nskb peek case carefully in kcm_wait_data(). Fortunately,\nskb_recv_datagram() already handles it nicely and is widely used by\nother sockets, we can just switch to skb_recv_datagram() after\ngetting rid of the unnecessary sock lock in kcm_recvmsg() and\nkcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,\nso it is safe to get rid of this check too.\n\nI ran the original syzbot reproducer for 30 min without seeing any\nissue."
}
],
"providerMetadata": {
"dateUpdated": "2025-05-04T08:45:54.817Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259"
},
{
"url": "https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931"
},
{
"url": "https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7"
},
{
"url": "https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a"
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{
"url": "https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3"
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{
"url": "https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020"
},
{
"url": "https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221"
}
],
"title": "kcm: close race conditions on sk_receive_queue",
"x_generator": {
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}
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"cveMetadata": {
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"cveId": "CVE-2022-49814",
"datePublished": "2025-05-01T14:09:38.389Z",
"dateReserved": "2025-05-01T14:05:17.226Z",
"dateUpdated": "2025-05-04T08:45:54.817Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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