{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98969", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.383Z", "datePublished": "2026-10-23T12:19:42.012Z", "dateUpdated": "2026-10-30T12:40:35.763Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:40:35.763Z" }, "descriptions": [ { "lang": "en", "value": "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" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/em_text.c" ], "versions": [ { "version": "d675c989ed2d4ba23dff615330b04371aea83534", "lessThan": "64153f1dd14dabfd4e79bf506bb5b5d66f7b42eb", "status": "affected", "versionType": "git" }, { "version": "d675c989ed2d4ba23dff615330b04371aea83534", "lessThan": "b62fb105961b677418cbc0a0a8837a41735729ec", "status": "affected", "versionType": "git" }, { "version": "d675c989ed2d4ba23dff615330b04371aea83534", "lessThan": "b4da5c85cd701066ff429727fb61b84bde8bcce2", "status": "affected", "versionType": "git" }, { "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" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/em_text.c" ], "versions": [ { "version": "2.6.13", "status": "affected" }, { "version": "0", "lessThan": "2.6.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.191", "lessThanOrEqual": "6.1.*", "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" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.10.273" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.15.224" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.1.191" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.12.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.18.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.2.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/64153f1dd14dabfd4e79bf506bb5b5d66f7b42eb" }, { "url": "https://git.kernel.org/stable/c/b62fb105961b677418cbc0a0a8837a41735729ec" }, { "url": "https://git.kernel.org/stable/c/b4da5c85cd701066ff429727fb61b84bde8bcce2" }, { "url": "https://git.kernel.org/stable/c/00bcc303000bac524d62eed054d77372b38ace0f" }, { "url": "https://git.kernel.org/stable/c/22182f91c6703af6e9832cffe6d22b381031cb5a" }, { "url": "https://git.kernel.org/stable/c/85e5512369d4fe6e5f2c43712d9f9e01d4ae8437" }, { "url": "https://git.kernel.org/stable/c/b627c6ba20be20334338229b4820baacb9d96826" }, { "url": "https://git.kernel.org/stable/c/c9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021" } ], "title": "net/sched: em_text: reject unterminated algo before autoload", "x_generator": { "engine": "bippy-1.2.0" } } } }