{"id":"CVE-2026-90079","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: fix cn20k mailbox lifetime on repeated rvu_mbox_init()\n\nrvu_mbox_init() is called separately for AF-PF mailboxes during probe\nand for AF-VF mailboxes when…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: fix cn20k mailbox lifetime on repeated rvu_mbox_init()\n\nrvu_mbox_init() is called separately for AF-PF mailboxes during probe\nand for AF-VF mailboxes when…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-772"],"vendor":"Linux","product":"Linux","affected":["Linux >= e53ee4acb220acab6832669334279367b0206af6 < a0fcbea79f034f49bdd44915f28938922023458d","Linux >= e53ee4acb220acab6832669334279367b0206af6 < 3b11a77f69980932c3924054d66e565c9a135747","Linux 6.17"],"published":"2026-09-17","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:17:56.623","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90079","references":[{"url":"https://git.kernel.org/stable/c/3b11a77f69980932c3924054d66e565c9a135747","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a0fcbea79f034f49bdd44915f28938922023458d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c08314f91782983d67af0807ed1360e404ac4a8b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90079.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90079"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536319"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90079"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90079"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90079.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10641,"cvssSource":"vendor","ingestedAt":"2026-09-17T16:21:47.896Z","slug":"CVE-2026-90079","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: fix cn20k mailbox lifetime on repeated rvu_mbox_init()\n\nrvu_mbox_init() is called separately for AF-PF mailboxes during probe\nand for AF-VF mailboxes when SR-IOV is enabled.  Each call used to\nallocate a new ng_rvu object, leaking the first allocation when the\npointer was overwritten on the second call.\n\nSharing one ng_rvu across both paths exposed several teardown bugs:\nthe error path freed all cn20k mailbox DMA and kfree()d ng_rvu even\nwhen only the failing init type should be unwound, leaving live AF-PF\nmailbox memory in use after an AF-VF init failure.  mutex_init() was\nalso re-run on the AF-VF path while AF-PF mailbox handlers could still\nhold rvu->mbox_lock.  Probe and SR-IOV failure paths did not release\ncn20k mailbox DMA either, since cleanup only happened in rvu_remove().\n\nAllocate ng_rvu once with devm_kzalloc(), initialize mbox_lock in the\nsame block, unwind only the mailbox memory for the failing init type,\nand free cn20k mailbox DMA from the probe and pci_enable_sriov()\nerror paths.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90079.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":216346,"id":"CVE-2026-90079","ts":1791274100121,"field":"cvss","old":null,"new":"5.5"},{"seq":216345,"id":"CVE-2026-90079","ts":1791274100121,"field":"severity","old":"none","new":"medium"}]}