CVE-2026-63972 (GCVE-0-2026-63972)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:37
VLAI
EPSS
VEX
Title
net: mana: Skip redundant detach on already-detached port
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: mana: Skip redundant detach on already-detached port
When mana_per_port_queue_reset_work_handler() runs after a previous
detach succeeded but attach failed, the port is left in a detached
state with apc->tx_qp and apc->rxqs already freed. Calling
mana_detach() again unconditionally leads to NULL pointer dereferences
during queue teardown.
Add an early exit in mana_detach() when the port is already in
detached state (!netif_device_present) for non-close callers, making
it safe to call idempotently. This allows the queue reset handler and
other recovery paths to simply retry mana_attach() without redundant
teardown.
Severity
7.5 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
fb9f98e1041a30dd5766620a2a64cb472b54caa9 , < c4152b4e28b3e550ec99351bf900e2c24c2608cc
(git)
Affected: 3b194343c25084a8d2fa0c0f2c9e80f3080fd732 , < 7ae590797f9b5c240aaea5773f5f00977a42a846 (git) Affected: 3b194343c25084a8d2fa0c0f2c9e80f3080fd732 , < 5b05aa36ee24297d7296ca58dfd8c448d0e4cda3 (git) Affected: 6.18.33 , < 6.18.35 (semver) |
guessed | |
| Linux | Linux |
Affected:
7.0
Unaffected: 0 , < 7.0 (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/microsoft/mana/mana_en.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "c4152b4e28b3e550ec99351bf900e2c24c2608cc",
"status": "affected",
"version": "fb9f98e1041a30dd5766620a2a64cb472b54caa9",
"versionType": "git"
},
{
"lessThan": "7ae590797f9b5c240aaea5773f5f00977a42a846",
"status": "affected",
"version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732",
"versionType": "git"
},
{
"lessThan": "5b05aa36ee24297d7296ca58dfd8c448d0e4cda3",
"status": "affected",
"version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732",
"versionType": "git"
},
{
"lessThan": "6.18.35",
"status": "affected",
"version": "6.18.33",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/microsoft/mana/mana_en.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "7.0"
},
{
"lessThan": "7.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.35",
"versionStartIncluding": "6.18.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.12",
"versionStartIncluding": "7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "7.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Skip redundant detach on already-detached port\n\nWhen mana_per_port_queue_reset_work_handler() runs after a previous\ndetach succeeded but attach failed, the port is left in a detached\nstate with apc-\u003etx_qp and apc-\u003erxqs already freed. Calling\nmana_detach() again unconditionally leads to NULL pointer dereferences\nduring queue teardown.\n\nAdd an early exit in mana_detach() when the port is already in\ndetached state (!netif_device_present) for non-close callers, making\nit safe to call idempotently. This allows the queue reset handler and\nother recovery paths to simply retry mana_attach() without redundant\nteardown."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The primary path is mana_tx_timeout() on Azure MANA NICs, triggered by the netdev TX watchdog when queues stall; remote peers on internet-facing VMs can induce TX stalls that schedule the vulnerable mana_detach() recovery workqueue.\nAC:L - An attacker can repeatedly provoke TX watchdog timeouts and control retry timing; while attach failure between cycles may need memory pressure, remote connection floods can contribute and the attacker controls both sides of the reset race.\nPR:N - The TX-timeout recovery path requires no local VM privileges\u2014only network reachability to influence the victim\u0027s MANA interface TX queue behavior and trigger automated driver recovery.\nUI:N - Exploitation is fully automated through the kernel netdev watchdog timer and workqueue handler with no victim user interaction required.\nS:U - Impact is a kernel panic within the same Azure VM guest; the MANA driver runs in guest context and does not cross a VM/host security boundary.\nC:N - The bug is a NULL pointer dereference during redundant queue teardown on already-freed pointers, causing a crash with no information disclosure primitive.\nI:N - There is no data modification or exploitable write primitive; the failure mode is dereferencing NULL tx_qp/rxqs pointers during teardown.\nA:H - The NULL pointer dereference in mana_detach()/mana_dealloc_queues() causes a kernel oops/panic, fully disrupting VM availability on affected Azure instances."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:37:43.858Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c4152b4e28b3e550ec99351bf900e2c24c2608cc"
},
{
"url": "https://git.kernel.org/stable/c/7ae590797f9b5c240aaea5773f5f00977a42a846"
},
{
"url": "https://git.kernel.org/stable/c/5b05aa36ee24297d7296ca58dfd8c448d0e4cda3"
}
],
"title": "net: mana: Skip redundant detach on already-detached port",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-63972",
"datePublished": "2026-07-19T14:55:58.503Z",
"dateReserved": "2026-07-19T07:54:57.024Z",
"dateUpdated": "2026-08-05T12:37:43.858Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-63972",
"date": "2026-09-30",
"epss": "0.00592",
"percentile": "0.46259"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/microsoft/mana/mana_en.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "c4152b4e28b3e550ec99351bf900e2c24c2608cc",
"status": "affected",
"version": "fb9f98e1041a30dd5766620a2a64cb472b54caa9",
"versionType": "git"
},
{
"lessThan": "7ae590797f9b5c240aaea5773f5f00977a42a846",
"status": "affected",
"version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732",
"versionType": "git"
},
{
"lessThan": "5b05aa36ee24297d7296ca58dfd8c448d0e4cda3",
"status": "affected",
"version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732",
"versionType": "git"
},
{
"lessThan": "6.18.35",
"status": "affected",
"version": "6.18.33",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/microsoft/mana/mana_en.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "7.0"
},
{
"lessThan": "7.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Skip redundant detach on already-detached port\n\nWhen mana_per_port_queue_reset_work_handler() runs after a previous\ndetach succeeded but attach failed, the port is left in a detached\nstate with apc-\u003etx_qp and apc-\u003erxqs already freed. Calling\nmana_detach() again unconditionally leads to NULL pointer dereferences\nduring queue teardown.\n\nAdd an early exit in mana_detach() when the port is already in\ndetached state (!netif_device_present) for non-close callers, making\nit safe to call idempotently. This allows the queue reset handler and\nother recovery paths to simply retry mana_attach() without redundant\nteardown."
}
],
"id": "CVE-2026-63972",
"lastModified": "2026-07-30T14:51:11.223",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-07-19T16:17:16.283",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5b05aa36ee24297d7296ca58dfd8c448d0e4cda3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7ae590797f9b5c240aaea5773f5f00977a42a846"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c4152b4e28b3e550ec99351bf900e2c24c2608cc"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
},
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-07-21T16:12:36+00:00",
"cve": "CVE-2026-63972",
"id": "CVE-2026-63972",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: mana: Skip redundant detach on already-detached port",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63972.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-18T00:45:34Z",
"cve": "CVE-2026-63972",
"id": "CVE-2026-63972",
"initial_release_date": "2026-07-21T13:02:26Z",
"product_status:first_fixed": "33",
"product_status:known_affected": "583",
"product_status:known_not_affected": "167",
"product_status:recommended": "252",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-63972",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63972.json",
"version": "14"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…