CVE-2022-50476 (GCVE-0-2022-50476)
Vulnerability from cvelistv5
Published
2025-10-04 15:16
Modified
2025-10-04 15:16
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ntb_netdev: Use dev_kfree_skb_any() in interrupt context
TX/RX callback handlers (ntb_netdev_tx_handler(),
ntb_netdev_rx_handler()) can be called in interrupt
context via the DMA framework when the respective
DMA operations have completed. As such, any calls
by these routines to free skb's, should use the
interrupt context safe dev_kfree_skb_any() function.
Previously, these callback handlers would call the
interrupt unsafe version of dev_kfree_skb(). This has
not presented an issue on Intel IOAT DMA engines as
that driver utilizes tasklets rather than a hard
interrupt handler, like the AMD PTDMA DMA driver.
On AMD systems, a kernel WARNING message is
encountered, which is being issued from
skb_release_head_state() due to in_hardirq()
being true.
Besides the user visible WARNING from the kernel,
the other symptom of this bug was that TCP/IP performance
across the ntb_netdev interface was very poor, i.e.
approximately an order of magnitude below what was
expected. With the repair to use dev_kfree_skb_any(),
kernel WARNINGs from skb_release_head_state() ceased
and TCP/IP performance, as measured by iperf, was on
par with expected results, approximately 20 Gb/s on
AMD Milan based server. Note that this performance
is comparable with Intel based servers.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d Version: 548c237c0a9972df5d1afaca38aa733ee577128d |
||
{
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"programFiles": [
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"versions": [
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},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "4.9.337",
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},
{
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"status": "unaffected",
"version": "4.14.303",
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},
{
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"status": "unaffected",
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},
{
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},
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},
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},
{
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.2",
"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\nntb_netdev: Use dev_kfree_skb_any() in interrupt context\n\nTX/RX callback handlers (ntb_netdev_tx_handler(),\nntb_netdev_rx_handler()) can be called in interrupt\ncontext via the DMA framework when the respective\nDMA operations have completed. As such, any calls\nby these routines to free skb\u0027s, should use the\ninterrupt context safe dev_kfree_skb_any() function.\n\nPreviously, these callback handlers would call the\ninterrupt unsafe version of dev_kfree_skb(). This has\nnot presented an issue on Intel IOAT DMA engines as\nthat driver utilizes tasklets rather than a hard\ninterrupt handler, like the AMD PTDMA DMA driver.\nOn AMD systems, a kernel WARNING message is\nencountered, which is being issued from\nskb_release_head_state() due to in_hardirq()\nbeing true.\n\nBesides the user visible WARNING from the kernel,\nthe other symptom of this bug was that TCP/IP performance\nacross the ntb_netdev interface was very poor, i.e.\napproximately an order of magnitude below what was\nexpected. With the repair to use dev_kfree_skb_any(),\nkernel WARNINGs from skb_release_head_state() ceased\nand TCP/IP performance, as measured by iperf, was on\npar with expected results, approximately 20 Gb/s on\nAMD Milan based server. Note that this performance\nis comparable with Intel based servers."
}
],
"providerMetadata": {
"dateUpdated": "2025-10-04T15:16:36.895Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d4460c82177899751975180c268f352893302221"
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{
"url": "https://git.kernel.org/stable/c/dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67"
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{
"url": "https://git.kernel.org/stable/c/8b78493968ed3cef0326183ed059c55e42f24d5b"
},
{
"url": "https://git.kernel.org/stable/c/a6b9e09403102bdf8402dae734800e4916c7ea58"
},
{
"url": "https://git.kernel.org/stable/c/13286ad1c7c49c606fdcba4cf66f953a1a16c1ca"
},
{
"url": "https://git.kernel.org/stable/c/21296a52caa6a6bad6debdfe40ad81d4f1a27e69"
},
{
"url": "https://git.kernel.org/stable/c/14d245da57a11e80277ab455aa9b6dcc5ed38a19"
},
{
"url": "https://git.kernel.org/stable/c/07e28a8f450217db679802ebd4de0915556ce846"
},
{
"url": "https://git.kernel.org/stable/c/5f7d78b2b12a9d561f48fa00bab29b40f4616dad"
}
],
"title": "ntb_netdev: Use dev_kfree_skb_any() in interrupt context",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-50476",
"datePublished": "2025-10-04T15:16:36.895Z",
"dateReserved": "2025-10-04T15:13:33.467Z",
"dateUpdated": "2025-10-04T15:16:36.895Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2022-50476\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-04T16:15:44.177\",\"lastModified\":\"2025-10-06T14:56:47.823\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nntb_netdev: Use dev_kfree_skb_any() in interrupt context\\n\\nTX/RX callback handlers (ntb_netdev_tx_handler(),\\nntb_netdev_rx_handler()) can be called in interrupt\\ncontext via the DMA framework when the respective\\nDMA operations have completed. As such, any calls\\nby these routines to free skb\u0027s, should use the\\ninterrupt context safe dev_kfree_skb_any() function.\\n\\nPreviously, these callback handlers would call the\\ninterrupt unsafe version of dev_kfree_skb(). This has\\nnot presented an issue on Intel IOAT DMA engines as\\nthat driver utilizes tasklets rather than a hard\\ninterrupt handler, like the AMD PTDMA DMA driver.\\nOn AMD systems, a kernel WARNING message is\\nencountered, which is being issued from\\nskb_release_head_state() due to in_hardirq()\\nbeing true.\\n\\nBesides the user visible WARNING from the kernel,\\nthe other symptom of this bug was that TCP/IP performance\\nacross the ntb_netdev interface was very poor, i.e.\\napproximately an order of magnitude below what was\\nexpected. With the repair to use dev_kfree_skb_any(),\\nkernel WARNINGs from skb_release_head_state() ceased\\nand TCP/IP performance, as measured by iperf, was on\\npar with expected results, approximately 20 Gb/s on\\nAMD Milan based server. Note that this performance\\nis comparable with Intel based servers.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07e28a8f450217db679802ebd4de0915556ce846\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/13286ad1c7c49c606fdcba4cf66f953a1a16c1ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/14d245da57a11e80277ab455aa9b6dcc5ed38a19\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/21296a52caa6a6bad6debdfe40ad81d4f1a27e69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f7d78b2b12a9d561f48fa00bab29b40f4616dad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8b78493968ed3cef0326183ed059c55e42f24d5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6b9e09403102bdf8402dae734800e4916c7ea58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4460c82177899751975180c268f352893302221\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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