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CVE-2026-23319: 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: bpf: Fix a UAF issue in bpf_trampoline_link_cgroup_shim The root cause of this bug is that when 'bpf_link_put' reduces the refcount of 'shim_link->link.link' to zero, the resource is considered released but may still be referenced via 'tr->progs_hlist' in 'cgroup_shim_find'. The actual cleanup of 'tr->progs_hlist' in 'bpf_shim_tramp_link_release' is deferred. During this window, another process can cause a use-after-free via 'bpf_trampoline_link_cgroup_shim'. Based on Martin KaFai Lau's suggestions, I have created a simple patch. To fix this: Add an atomic non-zero check in 'bpf_trampoline_link_cgroup_shim'. Only increment the refcount if it is not already zero. Testing: I verified the fix by adding a delay in 'bpf_shim_tramp_link_release' to make the bug easier to trigger: static void bpf_shim_tramp_link_release(struct bpf_link *link) { /* ... */ if (!shim_link->trampoline) return; + msleep(100); WARN_ON_ONCE(bpf_trampoline_unlink_prog(&shim_link->link, shim_link->trampoline, NULL)); bpf_trampoline_put(shim_link->trampoline); } Before the patch, running a PoC easily reproduced the crash(almost 100%) with a call trace similar to KaiyanM's report. After the patch, the bug no longer occurs even after millions of iterations.

    Засегнати продукти

    • Linux Linux: 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e преди 529e685e522b9d7fb379dbe6929dcdf520e34c8c; 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e преди 9b02c5c4147f8af8ed783c8deb5df927a55c3951; 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e преди cfcfa0ca0212162aa472551266038e8fd6768cff; 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e преди 3eeddb80191f7626ec1ef742bfff51ec3b0fa5c2; 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e преди 4e8a0005d633a4adc98e3b65d5080f93b90d356b; 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e преди 56145d237385ca0e7ca9ff7b226aaf2eb8ef368b
    • Linux Linux: 6.0; преди 6.0; 6.1.167 до 6.1.*; 6.6.130 до 6.6.*; 6.12.77 до 6.12.*; 6.18.17 до 6.18.*; 6.19.7 до 6.19.*; от 7.0 нататък
    • Siemens: още 4 продукта, добавени от Siemens

      SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

    История

    • 25 март 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-23319: Linux | freedomonline.bg