CVE-2026-74719 (GCVE-0-2026-74719)
Vulnerability from cvelistv5
Published
2026-08-22 15:33
Modified
2026-08-22 15:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()
The SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in
smc_llc_event_handler() stores an incoming qentry into the local LLC flow
without first checking whether a qentry is already pending. If a malicious or
buggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is
active and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the
pointer without freeing the previous allocation, leaking one kmalloc-96 object
per spurious message.
The sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry
guard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a
duplicate message when qentry is already occupied falls through to break and is
freed by the kfree(qentry) at the out: label, rather than silently leaking the
existing allocation.
The response direction (smc_llc_rx_response()) is unaffected: it already guards
with flow->qentry at the equivalent site and drops duplicate responses
correctly.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 Version: 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 |
||
{
"containers": {
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"version": "0",
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"status": "unaffected",
"version": "5.10.265",
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{
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"status": "unaffected",
"version": "5.15.216",
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
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{
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{
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"cpeApplicability": [
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"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()\n\nThe SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in\nsmc_llc_event_handler() stores an incoming qentry into the local LLC flow\nwithout first checking whether a qentry is already pending. If a malicious or\nbuggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is\nactive and flow-\u003eqentry is already set, smc_llc_flow_qentry_set() overwrites the\npointer without freeing the previous allocation, leaking one kmalloc-96 object\nper spurious message.\n\nThe sibling SMC_LLC_DELETE_LINK branch already has the correct !flow-\u003eqentry\nguard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a\nduplicate message when qentry is already occupied falls through to break and is\nfreed by the kfree(qentry) at the out: label, rather than silently leaking the\nexisting allocation.\n\nThe response direction (smc_llc_rx_response()) is unaffected: it already guards\nwith flow-\u003eqentry at the equivalent site and drops duplicate responses\ncorrectly."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-22T15:33:12.716Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78"
},
{
"url": "https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d"
},
{
"url": "https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33"
},
{
"url": "https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d"
},
{
"url": "https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6"
},
{
"url": "https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82"
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{
"url": "https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846"
},
{
"url": "https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0"
}
],
"title": "net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()",
"x_generator": {
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}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-74719",
"datePublished": "2026-08-22T15:33:12.716Z",
"dateReserved": "2026-08-15T05:44:03.929Z",
"dateUpdated": "2026-08-22T15:33:12.716Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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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