{"id":"CVE-2026-90309","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Hold CQ references when processing EQ events\n\nEQ handlers look up CQs from dev->cq_xa and invoke CQ completion or\nerror callbacks outside the xarray lock","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Hold CQ references when processing EQ events\n\nEQ handlers look up CQs from dev->cq_xa and invoke CQ completion or\nerror callbacks outside the xarray lock. e…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 155055771704f8cbb5c176a4309b7dc30a50450c < 610ef81797bb4f709e8675c1d8d093bb9ccdcbd8","Linux >= 155055771704f8cbb5c176a4309b7dc30a50450c < c0a83f29a24c7e7f8516630848ef6db4c174deed","Linux >= 155055771704f8cbb5c176a4309b7dc30a50450c < 05b8ca493dd02319bca93c640b259c2ba51ef321","Linux >= 155055771704f8cbb5c176a4309b7dc30a50450c < 1fc9c1933959d2776a1ce7bf424251b8b5b586cd","Linux >= 155055771704f8cbb5c176a4309b7dc30a50450c < 4545f355654d044d35a31cd01cc46f491a8a7c36","Linux >= 155055771704f8cbb5c176a4309b7dc30a50450c < 98df2aee1459ee1c62c70cbe9b370d2a532aea36","Linux 6.0"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:52.977","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90309","references":[{"url":"https://git.kernel.org/stable/c/05b8ca493dd02319bca93c640b259c2ba51ef321","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00164,"epssPercentile":0.06023,"ingestedAt":"2026-09-17T16:21:47.827Z","slug":"CVE-2026-90309","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Hold CQ references when processing EQ events\n\nEQ handlers look up CQs from dev->cq_xa and invoke CQ completion or\nerror callbacks outside the xarray lock. erdma_destroy_cq() can erase the\nCQ from the xarray and free its queue buffer and doorbell record while a\npreviously scheduled EQ handler is still using the CQ.\n\nAdd a CQ refcount and take a reference under the xarray lock with\nrefcount_inc_not_zero(). Remove the CQ from the xarray before dropping\nthe destroy-path reference, then wait for in-flight EQ users before\nreleasing CQ resources.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207243,"id":"CVE-2026-90309","ts":1789757339857,"field":"cvss","old":null,"new":"7.8"},{"seq":207242,"id":"CVE-2026-90309","ts":1789757339857,"field":"severity","old":"none","new":"high"}]}