CVE-2026-63972

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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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "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's 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/microsoft/mana/mana_en.c"], "versions": [{"version": "fb9f98e1041a30dd5766620a2a64cb472b54caa9", "lessThan": "c4152b4e28b3e550ec99351bf900e2c24c2608cc", "status": "affected", "versionType": "git"}, {"version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732", "lessThan": "7ae590797f9b5c240aaea5773f5f00977a42a846", "status": "affected", "versionType": "git"}, {"version": "3b194343c25084a8d2fa0c0f2c9e80f3080fd732", "lessThan": "5b05aa36ee24297d7296ca58dfd8c448d0e4cda3", "status": "affected", "versionType": "git"}, {"version": "6.18.33", "lessThan": "6.18.35", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/microsoft/mana/mana_en.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.33", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1"}]}]}], "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"}}}}

{}

{"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"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9CA0794D-D2B6-4D31-B5DB-30331CF0D9D7", "versionEndExcluding": "6.18.35", "versionStartIncluding": "6.18.33", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "928FFB59-94A1-4243-84F6-B3700D2F3B6E", "versionEndExcluding": "7.0.12", "versionStartIncluding": "7.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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->tx_qp and apc->rxqs 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": "2026-10-02T19:41:02.587", "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", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b05aa36ee24297d7296ca58dfd8c448d0e4cda3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ae590797f9b5c240aaea5773f5f00977a42a846"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4152b4e28b3e550ec99351bf900e2c24c2608cc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: mana: Skip redundant detach on already-detached port", "id": "2502437", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502437"}, "csaw": false, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: mana: Skip redundant detach on already-detached port\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->tx_qp and apc->rxqs already freed. Calling\nmana_detach() again unconditionally leads to NULL pointer dereferences\nduring queue teardown.\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.", "A flaw was found in the Linux kernel's mana network driver. An issue arises when the driver attempts a redundant detach operation on an already-detached network port. This can cause a null pointer dereference, leading to a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-63972", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63972\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63972\nhttps://lore.kernel.org/linux-cve-announce/2026071900-CVE-2026-63972-403c@gregkh/T"]}

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