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CVE-2026-98969: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net/sched: em_text: reject unterminated algo before autoload This is a follow-up to commit 9c572a83037a ("net/sched: fix potential stack infoleak in em_text_dump()"), which zero-initialised the dump-side struct. Sashiko pointed at a pre-existing bug that exposed the change-side input-validation gap open. em_text_change() casts the raw netlink attribute payload to struct tcf_em_text and passes conf->algo, a 16-byte array with no enforced NUL terminator, to textsearch_prepare(). On the TS_AUTOLOAD retry textsearch_prepare() calls request_module("ts_%s", algo); vsnprintf() walks %s until it finds a NUL, so an algo[] with no NUL reads past the array into the adjacent struct fields and payload and feeds those bytes to the usermode helper command line. This is an out-of-bounds read and a kernel memory disclosure. Reject the attribute when no NUL exists within TC_EM_TEXT_ALGOSIZ bytes, matching the check xt_string has had since 3ab720881b6e. Conditions to recreate the bug: - CAP_NET_ADMIN on the target netns (namespace-local via unshare -Urn is enough) - install clsact on an interface, then add a basic filter with one text ematch whose algo[] is 16 bytes with no NUL (e.g. "A"*16) and pattern_len at least 1 - the add fails with -ENOENT and the kernel invokes modprobe with a module name made of "ts_" plus the 16 bytes and the adjacent payload

    Засегнати продукти

    • Linux Linux: d675c989ed2d4ba23dff615330b04371aea83534 преди 64153f1dd14dabfd4e79bf506bb5b5d66f7b42eb; d675c989ed2d4ba23dff615330b04371aea83534 преди b62fb105961b677418cbc0a0a8837a41735729ec; d675c989ed2d4ba23dff615330b04371aea83534 преди b4da5c85cd701066ff429727fb61b84bde8bcce2; d675c989ed2d4ba23dff615330b04371aea83534 преди 00bcc303000bac524d62eed054d77372b38ace0f; d675c989ed2d4ba23dff615330b04371aea83534 преди 22182f91c6703af6e9832cffe6d22b381031cb5a; d675c989ed2d4ba23dff615330b04371aea83534 преди 85e5512369d4fe6e5f2c43712d9f9e01d4ae8437; d675c989ed2d4ba23dff615330b04371aea83534 преди b627c6ba20be20334338229b4820baacb9d96826; d675c989ed2d4ba23dff615330b04371aea83534 преди c9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021
    • Linux Linux: 2.6.13; преди 2.6.13; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.113 до 6.12.*; 6.18.57 до 6.18.*; 7.2.11 до 7.2.*; от 7.3 нататък

    История

    • 23 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98969: Linux | freedomonline.bg