{"id":"CVE-2026-98903","title":"mailbox: imx: Add a channel shutdown field","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmailbox: imx: Add a channel shutdown field\n\nsashiko complained about possible teardown problem. The scenario\n\n CPU 0                              CPU 1\n  imx_mu_isr()  …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 02273054b2e94e53065ea5644265bb9d8f7ee2a7","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 944d8509c2220a2313d4a094a646507929fb6f8d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5ccea7eacb7786c358833634f45700365f6c1d99","Linux < 6.12.111","Linux < 6.18.53","Linux (all versions)"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T11:54:15.010Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98903","references":[{"url":"https://git.kernel.org/stable/c/02273054b2e94e53065ea5644265bb9d8f7ee2a7"},{"url":"https://git.kernel.org/stable/c/944d8509c2220a2313d4a094a646507929fb6f8d"},{"url":"https://git.kernel.org/stable/c/5ccea7eacb7786c358833634f45700365f6c1d99"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.573Z","slug":"CVE-2026-98903","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmailbox: imx: Add a channel shutdown field\n\nsashiko complained about possible teardown problem. The scenario\n\n CPU 0                              CPU 1\n  imx_mu_isr()                   imx_mu_shutdown()\n                                   imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));\n    imx_mu_specific_rx()\n      imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, 0), 0);\n                                   free_irq()\n\nThe RX event remains enabled because in this short window the RX event\nwas disabled in ->shutdown() while the interrupt was active and then\nenabled again by the ISR while ->shutdown waited in free_irq().\n\nThis race requires timing and if happens can be problematic on shared\nhandlers if the \"removed\" channel triggers an interrupt. In this case\nthe irq-core will shutdown the interrupt with the \"nobody cared\"\nmessage.\n\nIntroduce imx_mu_con_priv::shutdown to signal that the channel is\nshutting down. This flag is set with the lock held (by\nimx_mu_xcr_clr_shut()). The unmask side uses imx_mu_xcr_set_act() which\nonly enables the event if the channel has not been shutdown and\nserialises on the same lock.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 02273054b2e94e53065ea5644265bb9d8f7ee2a7`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 944d8509c2220a2313d4a094a646507929fb6f8d`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5ccea7eacb7786c358833634f45700365f6c1d99`\n- `Linux < 6.12.111`\n- `Linux < 6.18.53`\n- `Linux (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}