{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63972","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.024Z","datePublished":"2026-07-19T14:55:58.503Z","dateUpdated":"2026-08-05T12:37:43.858Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:37:43.858Z"},"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."}],"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—only 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"}}}}