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CVE-2026-98840: 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: vc_screen: reload vc pointer before if (ret) in vcs_write() to avoid UAF The reload of 'vc' added by commit 8fb9ea65c9d1 ("vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF") sits after the 'if (ret)' block, so the copy-failure break path exits the loop without reloading vc. If the vc was kfree()'d via vc_port_destruct during the unlocked copy_from_user() window, the post-loop 'if (written && vc) vcs_scr_updated(vc)' is reached with a stale non-NULL vc. The '&& vc' guard from commit a287620312dc ("vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write") only handles the NULL case, not this stale-non-NULL case; vcs_notifier() then reads param->vc->vc_num from freed memory: BUG: KASAN: slab-use-after-free in vcs_notifier+0x7c/0xd0 Read of size 2 at addr ffff888007149190 Call Trace: vcs_notifier+0x7c/0xd0 atomic_notifier_call_chain+0x70/0xa0 vcs_scr_updated+0x77/0xa0 vcs_write+0x71b/0x7e0 Allocated by task: vc_allocate -> con_install -> tty_open Freed by task: kfree <- vt_ioctl (VT_DISALLOCATE -> vc_port_destruct) Move the reload to immediately after console_lock(), before 'if (ret)', so every break path below passes a fresh vc to the post-loop vcs_scr_updated().

    Засегнати продукти

    • Linux Linux: 43a6281790273c1b0a9ab76609ff0245b968f1e6 преди cbc05413d3694193494b2374b56bae801ac41fec; b6bbb85cf45bf0b070e741997fe0af3a772c5ad5 преди 942742000a0288d4ca60c448894aabacd48004d5; ff4806202749a51938236214adc0281481a57366 преди c9f56d4b29792a62b17f2051ba93fd3b40a479ec; 8232fca738011ca2ec865b46ec721d1796dc0580 преди c073d01f6f5367c3a4f07efd507274ed0d03acd0; 73049768ad57145acd337102c5aa3c788e6642c8 преди 1485a3dd97ab1af2605243cabe6b604546d46dd1; 7cc3dd79777f6ae4625ec37e84dd18a26dc88bde преди 233a2e190b12884d186027d0b86d43a48799b69c; a287620312dc6dcb9a093417a0e589bf30fcf38a преди 9dfcadc5e003fb250dd471db90144bd5366140e9; a287620312dc6dcb9a093417a0e589bf30fcf38a преди 226bd5603371cd9f6642cbb9e9a677f445de3530; 74be188eb2dc1c99d63986167b9a67d415fe7326; 09a43e81279b8da15526da09877134b8bcf618b0; 5.10.260 преди 5.10.273; 5.15.211 преди 5.15.224; 6.1.177 преди 6.1.191; 6.6.144 преди 6.6.160; 6.12.95 преди 6.12.113; 6.18.37 преди 6.18.56; 7.0.14 преди 7.1; 7.1.2 преди 7.2
    • Linux Linux: 7.2; преди 7.2; 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.*; 6.18.56 до 6.18.*; 7.2.10 до 7.2.*; от 7.3 нататък

    История

    • 18 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98840: Linux | freedomonline.bg