{"id":"CVE-2026-80678","state":"PUBLISHED","title":"i2c: imx: Fix slave registration race and error handling","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: imx: Fix slave registration race and error handling\n\nIn i2c_imx_reg_slave(), the slave pointer was assigned before\npm_runtime_resume_and_get().  If pm_runtime_resume_and_get() failed,\nthe error path returned without clearing i2c_imx->slave, leaving it\nnon-NULL and causing all subsequent registration attempts to fail\nwith -EBUSY.\n\nAdditionally, because this driver uses a shared IRQ, the interrupt\nhandler i2c_imx_isr() can execute concurrently and, after acquiring\nslave_lock, dereference i2c_imx->slave.  The previous fix attempt\nadded a lockless i2c_imx->slave = NULL on the error path, but that\ncould race with the ISR under the lock and still cause a NULL pointer\ndereference.\n\nFix both issues by deferring the assignment of i2c_imx->slave and\ni2c_imx->last_slave_event to after a successful resume, and by\nperforming the assignment inside the slave_lock critical section.\nThis guarantees that the slave pointer is never left stale on the\nerror path and is always valid when observed by the interrupt handler.","publishedAt":"2026-08-28T06:52:47.077Z","updatedAt":"2026-10-16T19:26:32.757Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"754bc62f72fd64b202462367134ac8ce95b005de","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"cfdf6e13518589f911b7eace6ccb788e4ed87397","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"12a4f0950a158d98552cbaeacc35edccd8d975fa","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"614ca6594e301ff682999797c2216e9685558a2b","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"d64ec362c369bbc33833f7936d5f3a706b0d5c45","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/i2c/busses/i2c-imx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/i2c/busses/i2c-imx.c"]}],"references":["https://git.kernel.org/stable/c/754bc62f72fd64b202462367134ac8ce95b005de","https://git.kernel.org/stable/c/cfdf6e13518589f911b7eace6ccb788e4ed87397","https://git.kernel.org/stable/c/b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8","https://git.kernel.org/stable/c/d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f","https://git.kernel.org/stable/c/12a4f0950a158d98552cbaeacc35edccd8d975fa","https://git.kernel.org/stable/c/614ca6594e301ff682999797c2216e9685558a2b","https://git.kernel.org/stable/c/d64ec362c369bbc33833f7936d5f3a706b0d5c45"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80678.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80678","state":"PUBLISHED","datePublished":"2026-08-28T06:52:47.077Z","dateUpdated":"2026-10-16T19:26:32.757Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.783Z"},"containers":{"cna":{"title":"i2c: imx: Fix slave registration race and error handling","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: imx: Fix slave registration race and error handling\n\nIn i2c_imx_reg_slave(), the slave pointer was assigned before\npm_runtime_resume_and_get().  If pm_runtime_resume_and_get() failed,\nthe error path returned without clearing i2c_imx->slave, leaving it\nnon-NULL and causing all subsequent registration attempts to fail\nwith -EBUSY.\n\nAdditionally, because this driver uses a shared IRQ, the interrupt\nhandler i2c_imx_isr() can execute concurrently and, after acquiring\nslave_lock, dereference i2c_imx->slave.  The previous fix attempt\nadded a lockless i2c_imx->slave = NULL on the error path, but that\ncould race with the ISR under the lock and still cause a NULL pointer\ndereference.\n\nFix both issues by deferring the assignment of i2c_imx->slave and\ni2c_imx->last_slave_event to after a successful resume, and by\nperforming the assignment inside the slave_lock critical section.\nThis guarantees that the slave pointer is never left stale on the\nerror path and is always valid when observed by the interrupt handler."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"754bc62f72fd64b202462367134ac8ce95b005de","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"cfdf6e13518589f911b7eace6ccb788e4ed87397","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"12a4f0950a158d98552cbaeacc35edccd8d975fa","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"614ca6594e301ff682999797c2216e9685558a2b","versionType":"git"},{"version":"f7414cd6923fd7f78e57086fc964ba2dc25db5c1","status":"affected","lessThan":"d64ec362c369bbc33833f7936d5f3a706b0d5c45","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/i2c/busses/i2c-imx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/i2c/busses/i2c-imx.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/754bc62f72fd64b202462367134ac8ce95b005de"},{"url":"https://git.kernel.org/stable/c/cfdf6e13518589f911b7eace6ccb788e4ed87397"},{"url":"https://git.kernel.org/stable/c/b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8"},{"url":"https://git.kernel.org/stable/c/d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f"},{"url":"https://git.kernel.org/stable/c/12a4f0950a158d98552cbaeacc35edccd8d975fa"},{"url":"https://git.kernel.org/stable/c/614ca6594e301ff682999797c2216e9685558a2b"},{"url":"https://git.kernel.org/stable/c/d64ec362c369bbc33833f7936d5f3a706b0d5c45"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is in i2c_imx_reg_slave() reached from kernel i2c_slave_register() during driver probe/module bind on embedded i.MX platforms; concurrent exploitation requires local I2C bus activity on the same adapter to fire the shared IRQ handler during registration.\nAC:L - The attacker controls the race by driving I2C slave traffic to trigger i2c_imx_isr() while registration runs, and can retry across reboots, OTA reprobes, or pm_runtime resume cycles until the unprotected slave-pointer window is hit.\nPR:N - No Linux credentials are needed when a physically proximate attacker races automated boot-time or service-driven i2c_slave_register() calls (DT probe, IPMI SSIF/MCTP backends) on imx I2C slave-capable controllers.\nUI:N - Exploitation requires no victim interaction; automated driver probe, suspend/resume, or maintenance-triggered slave registration provides the registration side of the race without user action.\nS:U - Impact is confined to kernel memory safety violations and crash on the same host; this is not a VM escape, IOMMU bypass, or other cross-security-authority boundary.\nC:H - The ISR can dereference a NULL or stale i2c_imx->slave under slave_lock when the error path races registration, violating memory safety and enabling arbitrary kernel read primitives per CVSS race/UAF guidance.\nI:H - Concurrent ISR handling during partial slave registration can corrupt driver state and invoke slave callbacks with inconsistent pointers, enabling heap manipulation and arbitrary kernel write or control-flow hijack beyond a simple crash.\nA:H - NULL or stale slave dereference in i2c_imx_isr()/i2c_imx_slave_event() causes kernel oops/panic; leaving slave non-NULL after failed pm_runtime_resume_and_get() also blocks all subsequent slave registration (-EBUSY) on affected controllers."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-29T06:22:05.188Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-80678","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:19:46.218826Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:26:32.757Z"}}]}}}