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CVE-2026-89555: Linux

9.8

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: mpls: reload header after pskb_may_pull() mpls_select_multipath() calls mpls_multipath_hash() to choose a nexthop when an MPLS route has multiple nexthops. While walking the MPLS label stack, the hash routine caches hdr for the current label. After finding the bottom-of-stack label, it calls pskb_may_pull() before reading the inner IP header. If an skb is constructed with the inner IP header in nonlinear data and insufficient tailroom in the linear head, pskb_may_pull() calls pskb_expand_head() to replace the skb head and free the old one. This leaves hdr pointing to freed memory. The IPv6 path can invalidate hdr again when it performs a second pull for the larger header. The issue was found through static analysis. A reproducer sending a legal Geneve packet through a bareudp/MPLS multipath setup triggered the same KASAN report in 2 of 2 unpatched runs: BUG: KASAN: slab-use-after-free in mpls_select_multipath Read of size 1 at addr ffff88800ecc6e20 by task ksoftirqd/1/23 Call Trace: mpls_select_multipath mpls_forward __netif_receive_skb_list_core netif_receive_skb_list_internal napi_complete_done gro_cell_poll __napi_poll net_rx_action Freed by task 23: kfree pskb_expand_head __pskb_pull_tail mpls_select_multipath Reload hdr from the current skb head after each successful pull before deriving the inner IPv4 or IPv6 header pointer.

Засегнати продукти

  • Linux Linux: 9f427a0e474a67b454420c131709600d44850486 преди aa4fe0b450a461aa1162fe8375f5d28f4c957df8; 9f427a0e474a67b454420c131709600d44850486 преди b1c0783b2facc398437ad8f8b86c636d7a78f8db; 9f427a0e474a67b454420c131709600d44850486 преди bfaaff99238326166694354a63a76c02563f98b1; 9f427a0e474a67b454420c131709600d44850486 преди d9640239827d6d0cb84263b590f7a4f1596c17eb; 9f427a0e474a67b454420c131709600d44850486 преди fed638a248116b8a249bd4202d28e5934bdc65ad; 9f427a0e474a67b454420c131709600d44850486 преди d82b90a38c2ca8a0694428eab0e9551c23f2447d; 9f427a0e474a67b454420c131709600d44850486 преди 49d38c1b4390412f8950d33dfaee0ccbd17beb81; 9f427a0e474a67b454420c131709600d44850486 преди 29e63b8d9fc150cc191b1c6eb7e16e1247e1b650; ad864d9fce0ec56cc8f6afe5c6a0e6d7f484b9eb; 4.9.8 преди 4.10
  • Linux Linux: 4.10; преди 4.10; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

  • 11 септември 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-89555: Linux | freedomonline.bg