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CVE-2026-89544: Linux

7.5

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: fix gssx_dec_option_array error path bugs Four coupled defects in the gssx XDR option-array decoder make the error paths unsafe: a NULL deref in the caller, a refcount leak on the decoded group_info, and a latent use-after-free that the leak fix would otherwise expose. gssx_dec_option_array() sets oa->count = 1 before allocating oa->data. If that allocation fails, -ENOMEM is returned with oa->count == 1 and oa->data == NULL. All other error paths jump to free_oa: which frees oa->data and NULLs it but also leaves oa->count == 1. The caller trusts the count: gssp_accept_sec_context_upcall() gssx_dec_accept_sec_context() gssx_dec_option_array() /* fails, count=1 data=NULL */ data = res.options.data[0].value /* NULL deref */ Independently, free_creds: releases the partially decoded svc_cred with a bare kfree(creds). gssx_dec_linux_creds() installs a groups_alloc() result into creds->cr_group_info; that object is kvmalloc-backed and refcounted, and only put_group_info() reaches kvfree(). A plain kfree(creds) drops the wrapper and leaks the group_info allocation. The natural fix for the leak is to call free_svc_cred(creds) before kfree(creds), but free_svc_cred() invokes put_group_info() on creds->cr_group_info unconditionally when non-NULL. The existing out_free_groups: path in gssx_dec_linux_creds() already called groups_free() on that pointer without clearing it, so once free_svc_cred() is wired in, the subsequent put_group_info() would touch freed memory. Fix all four together: - Move the oa->count = 1 assignment below the oa->data allocation so it is never set when oa->data is NULL. - Reset oa->count to 0 at free_oa: so count and data stay coherent and the caller sees an empty option array. - Call free_svc_cred(creds) before kfree(creds) at free_creds: so the refcounted cr_group_info is released. free_svc_cred() either NULL-g

Засегнати продукти

  • Linux Linux: bb336cd8d5ecb69c430ebe3e7bcff68471d93fa8 преди ac86b45bb978cd4fdbcaaca82dd0f2337f8e310c; dd292e884c649f9b1c18af0ec75ca90b390cd044 преди 3473139d15d67e2fd737cf0613082adb5499362f; 934212a623cbab851848b6de377eb476718c3e4c преди 993a9012e68b8667a0a9b316fd718680c7e008a0; 5e6013ae2c8d420faea553d363935f65badd32c3 преди 8c56a46db3b7523f13e167c3e2c6e3c47a87dcb3; 3cfcfc102a5e57b021b786a755a38935e357797d преди fb30241f7ccace372ee83017891549f23a715581; 3cfcfc102a5e57b021b786a755a38935e357797d преди 3ff45361e9469e85c0f86b8e7b82c63e50bab8ef; 3cfcfc102a5e57b021b786a755a38935e357797d преди f85a83774d7f4e2ac71c0c384df0dfb6f7d0179a; 3cfcfc102a5e57b021b786a755a38935e357797d преди 5e9a94539b1ec17a89177d952badfd0d844d694a; b97c37978ca825557d331c9012e0c1ddc0e42364; bfa9d86d39a0fe4685f90c3529aa9bd62a9d97a8; 9806c2393cd2ab0a8e7bb9ffae02ce20e3112ec4; 996997d1fb2126feda550d6adcedcbd94911fc69; 5.10.214 преди 5.10.273; 5.15.153 преди 5.15.224; 6.1.83 преди 6.1.191; 6.6.23 преди 6.6.160; 4.19.311 преди 4.20; 5.4.273 преди 5.5; 6.7.11 преди 6.8; 6.8.2 преди 6.9
  • Linux Linux: 6.9; преди 6.9; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.111 до 6.12.*; 6.18.51 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

  • 11 септември 2026 Публикувано

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