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CVE-2026-31421: 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: cls_fw: fix NULL pointer dereference on shared blocks The old-method path in fw_classify() calls tcf_block_q() and dereferences q->handle. Shared blocks leave block->q NULL, causing a NULL deref when an empty cls_fw filter is attached to a shared block and a packet with a nonzero major skb mark is classified. Reject the configuration in fw_change() when the old method (no TCA_OPTIONS) is used on a shared block, since fw_classify()'s old-method path needs block->q which is NULL for shared blocks. The fixed null-ptr-deref calling stack: KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] RIP: 0010:fw_classify (net/sched/cls_fw.c:81) Call Trace: tcf_classify (./include/net/tc_wrapper.h:197 net/sched/cls_api.c:1764 net/sched/cls_api.c:1860) tc_run (net/core/dev.c:4401) __dev_queue_xmit (net/core/dev.c:4535 net/core/dev.c:4790)

    Засегнати продукти

    • Linux Linux: 1abf272022cf1d18469405f47b4ec49c6a3125db преди d6d5bd62a09650856e1e2010eb09853eba0d64e1; 1abf272022cf1d18469405f47b4ec49c6a3125db преди febf64ca79a2d6540ab6e5e197fa0f4f7e84473e; 1abf272022cf1d18469405f47b4ec49c6a3125db преди 3d41f9a314afa94b1c7c7c75405920123220e8cd; 1abf272022cf1d18469405f47b4ec49c6a3125db преди 18328eff2f97d1a6adcdb6d4a0f42f2f83a31e28; 1abf272022cf1d18469405f47b4ec49c6a3125db преди 5cf41031922c154aa5ccda8bcdb0f5e6226582ec; 1abf272022cf1d18469405f47b4ec49c6a3125db преди 3cb055df9e8625ce699a259d8178d67b37f2b160; 1abf272022cf1d18469405f47b4ec49c6a3125db преди 96426c348def662b06bfdc65be3002905604927a; 1abf272022cf1d18469405f47b4ec49c6a3125db преди faeea8bbf6e958bf3c00cb08263109661975987c
    • Linux Linux: 4.15; преди 4.15; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.168 до 6.1.*; 6.6.134 до 6.6.*; 6.12.81 до 6.12.*; 6.18.22 до 6.18.*; 6.19.12 до 6.19.*; 7.0 до *
    • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *

    История

    • 13 април 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31421: Linux | freedomonline.bg