{"schema":"threatline.record/2","record":{"id":"CVE-2026-98969","aliases":[],"summary":"net/sched: em_text: reject unterminated algo before autoload","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: em_text: reject unterminated algo before autoload\n\nThis is a follow-up to commit 9c572a83037a (\"net/sched: fix potential\nstack infoleak in em_text_dump()\"), which zero-initialised the dump-side\nstruct. Sashiko pointed at a pre-existing bug that exposed the change-side\ninput-validation gap open.\n\nem_text_change() casts the raw netlink attribute payload to struct\ntcf_em_text and passes conf->algo, a 16-byte array with no enforced NUL\nterminator, to textsearch_prepare().  On the TS_AUTOLOAD retry\ntextsearch_prepare() calls request_module(\"ts_%s\", algo); vsnprintf()\nwalks %s until it finds a NUL, so an algo[] with no NUL reads past the\narray into the adjacent struct fields and payload and feeds those bytes\nto the usermode helper command line.  This is an out-of-bounds read and\na kernel memory disclosure.\n\nReject the attribute when no NUL exists within TC_EM_TEXT_ALGOSIZ bytes,\nmatching the check xt_string has had since 3ab720881b6e.\n\nConditions to recreate the bug:\n- CAP_NET_ADMIN on the target netns (namespace-local via unshare -Urn\n  is enough)\n- install clsact on an interface, then add a basic filter with one text\n  ematch whose algo[] is 16 bytes with no NUL (e.g. \"A\"*16) and\n  pattern_len at least 1\n- the add fails with -ENOENT and the kernel invokes modprobe with a\n  module name made of \"ts_\" plus the 16 bytes and the adjacent payload","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98969","source_modified_at":"2026-10-23T12:19:42.012Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"d675c989ed2d4ba23dff615330b04371aea83534","lessThan":"00bcc303000bac524d62eed054d77372b38ace0f","status":"affected","versionType":"git"},{"version":"d675c989ed2d4ba23dff615330b04371aea83534","lessThan":"22182f91c6703af6e9832cffe6d22b381031cb5a","status":"affected","versionType":"git"},{"version":"d675c989ed2d4ba23dff615330b04371aea83534","lessThan":"85e5512369d4fe6e5f2c43712d9f9e01d4ae8437","status":"affected","versionType":"git"},{"version":"d675c989ed2d4ba23dff615330b04371aea83534","lessThan":"b627c6ba20be20334338229b4820baacb9d96826","status":"affected","versionType":"git"},{"version":"d675c989ed2d4ba23dff615330b04371aea83534","lessThan":"c9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98969","source_modified_at":"2026-10-23T12:19:42.012Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.13","status":"affected"},{"version":"0","lessThan":"2.6.13","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98969","source_modified_at":"2026-10-23T12:19:42.012Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"00bcc303000bac524d62eed054d77372b38ace0f","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98969","source_modified_at":"2026-10-23T12:19:42.012Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"22182f91c6703af6e9832cffe6d22b381031cb5a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98969","source_modified_at":"2026-10-23T12:19:42.012Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"85e5512369d4fe6e5f2c43712d9f9e01d4ae8437","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:19:42.012Z","modified_at":"2026-10-23T12:19:42.012Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98969","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:19:42.012Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/00bcc303000bac524d62eed054d77372b38ace0f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/22182f91c6703af6e9832cffe6d22b381031cb5a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/85e5512369d4fe6e5f2c43712d9f9e01d4ae8437"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b627c6ba20be20334338229b4820baacb9d96826"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:19:42.012Z","content_hash":"dfa820087cbb063b9cb2652d3e79261e91f8111a602ca220b30c37be2b0c5928"}}