{"id":"CVE-2026-64496","revision":null,"records":[{"revision":"de30436754b1484da843ae31bb8d8fa7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64496","aliases":[],"title":"iio: event: Fix event FIFO reset race","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: event: Fix event FIFO reset race\n\n`iio_event_getfd()` creates the event file descriptor with\n`anon_inode_getfd()`, which allocates a new fd, creates the anonymous\nfile and installs it in the process fd table before returning to the\ncaller.\n\nThe IIO code resets the event FIFO after `anon_inode_getfd()` has returned,\nbut before `IIO_GET_EVENT_FD_IOCTL` has copied the fd number to userspace.\nBut since fd tables are shared between threads, another thread can guess\nthe newly allocated fd number and issue a `read()` on it as soon as the fd\nhas been installed.\n\nThis means the `kfifo_to_user()` in `iio_event_chrdev_read()` can run in\nparallel with the `kfifo_reset_out()` in `iio_event_getfd()`.\n\nThe kfifo documentation says that `kfifo_reset_out()` is only safe when it\nis called from the reader thread and there is only one concurrent reader.\nOtherwise it is dangerous and must be handled in the same way as\n`kfifo_reset()`.\n\nIf that happens, `kfifo_to_user()` can advance the FIFO `out` index based\non state from before the reset, after the reset has already moved the `out`\nindex to the current `in` index. That can leave the FIFO with an `out`\nindex past the `in` index. A later `read()` can then see an underflowed\nFIFO length and copy more data than the event FIFO buffer contains. This\ncan result in an out-of-bounds read and leak adjacent kernel memory to\nuserspace.\n\nMove the FIFO reset before `anon_inode_getfd()`. At that point the event fd is\nmarked busy, but the new fd has not been installed yet, so userspace cannot\naccess it while the FIFO is reset.","state":0,"publishedAt":"2026-07-25T08:51:53.194+00:00","modifiedAt":"2026-10-19T20:48:37.305+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/iio/industrialio-event.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"9dc84ba4be5bbeb29ee49efe6cea2cb32c461424\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"d16a702ca7d29c0b7a9b509339d1b044a1cadb32\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"a13ef1adbc62085b21b546b07b0be7e2fbf52150\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"0d4a646d7f87ea3625fafe387043fddc6a2f5e7f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"72c6aa8e0d74eab91b8694cde97dec088c248fee\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"9edefd4c56bee3fe331e0355d1f10a533134999d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"f187dc5a4c4846ffa07d9bda6e760837ed005574\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b91accafbb1031b80d22ad83576877ff2f8b4774\",\n \"lessThan\": \"af791d295737ea6b6ff2c8d8488462a49c14af01\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/iio/industrialio-event.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.15\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.15\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.261\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.96\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.39\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.4\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9dc84ba4be5bbeb29ee49efe6cea2cb32c461424","https://git.kernel.org/stable/c/d16a702ca7d29c0b7a9b509339d1b044a1cadb32","https://git.kernel.org/stable/c/a13ef1adbc62085b21b546b07b0be7e2fbf52150","https://git.kernel.org/stable/c/0d4a646d7f87ea3625fafe387043fddc6a2f5e7f","https://git.kernel.org/stable/c/72c6aa8e0d74eab91b8694cde97dec088c248fee","https://git.kernel.org/stable/c/9edefd4c56bee3fe331e0355d1f10a533134999d","https://git.kernel.org/stable/c/f187dc5a4c4846ffa07d9bda6e760837ed005574","https://git.kernel.org/stable/c/af791d295737ea6b6ff2c8d8488462a49c14af01"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64496","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64496","identifiers":["CVE-2026-64496"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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