{"id":"CVE-2026-23454","state":"PUBLISHED","title":"net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown\n\nA potential race condition exists in mana_hwc_destroy_channel() where\nhwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and\nEvent Queue (EQ) are destroyed. This allows an in-flight CQ interrupt\nhandler to dereference freed memory, leading to a use-after-free or\nNULL pointer dereference in mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() signals the hardware to stop but does not\nsynchronize against IRQ handlers already executing on other CPUs. The\nIRQ synchronization only happens in mana_hwc_destroy_cq() via\nmana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs\nafter kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler()\ncan dereference freed caller_ctx (and rxq->msg_buf) in\nmana_hwc_handle_resp().\n\nFix this by reordering teardown to reverse-of-creation order: destroy\nthe TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This\nensures all in-flight interrupt handlers complete before the memory they\naccess is freed.","publishedAt":"2026-04-03T15:15:36.189Z","updatedAt":"2026-10-15T01:15:14.968Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f","status":"affected","lessThan":"b88edf12fc3779521ae5f6f1584153b15f7da6df","versionType":"git"},{"version":"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f","status":"affected","lessThan":"e23bf444512cb85d76012080a76cd1f9e967448e","versionType":"git"},{"version":"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f","status":"affected","lessThan":"249e905571583a434d4ea8d6f92ccc0eef337115","versionType":"git"},{"version":"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f","status":"affected","lessThan":"2b001901f689021acd7bf2dceed74a1bdcaaa1f9","versionType":"git"},{"version":"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f","status":"affected","lessThan":"afdb1533eb9c05432aeb793a7280fa827c502f5c","versionType":"git"},{"version":"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f","status":"affected","lessThan":"05d345719d85b927cba74afac4d5322de3aa4256","versionType":"git"},{"version":"ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f","status":"affected","lessThan":"fa103fc8f56954a60699a29215cb713448a39e87","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/microsoft/mana/hw_channel.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/microsoft/mana/hw_channel.c"]}],"references":["https://git.kernel.org/stable/c/b88edf12fc3779521ae5f6f1584153b15f7da6df","https://git.kernel.org/stable/c/e23bf444512cb85d76012080a76cd1f9e967448e","https://git.kernel.org/stable/c/249e905571583a434d4ea8d6f92ccc0eef337115","https://git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9","https://git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5c","https://git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256","https://git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23454.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23454","state":"PUBLISHED","datePublished":"2026-04-03T15:15:36.189Z","dateUpdated":"2026-10-15T01:15:14.968Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:46.020Z"},"containers":{"cna":{"title":"net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown\n\nA potential race condition exists in mana_hwc_destroy_channel() where\nhwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and\nEvent Queue (EQ) are destroyed. This allows an in-flight CQ interrupt\nhandler to dereference freed memory, leading to a use-after-free or\nNULL pointer dereference in mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() signals the hardware to stop but does not\nsynchronize against IRQ handlers already executing on other CPUs. The\nIRQ synchronization only happens in mana_hwc_destroy_cq() via\nmana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs\nafter kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler()\ncan dereference freed caller_ctx (and rxq->msg_buf) in\nmana_hwc_handle_resp().\n\nFix this by reordering teardown to reverse-of-creation order: destroy\nthe TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. 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