Към съдържанието
Търсене

CVE-2026-23276: Linux

Няма оценка

CVSS

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net: add xmit recursion limit to tunnel xmit functions Tunnel xmit functions (iptunnel_xmit, ip6tunnel_xmit) lack their own recursion limit. When a bond device in broadcast mode has GRE tap interfaces as slaves, and those GRE tunnels route back through the bond, multicast/broadcast traffic triggers infinite recursion between bond_xmit_broadcast() and ip_tunnel_xmit()/ip6_tnl_xmit(), causing kernel stack overflow. The existing XMIT_RECURSION_LIMIT (8) in the no-qdisc path is not sufficient because tunnel recursion involves route lookups and full IP output, consuming much more stack per level. Use a lower limit of 4 (IP_TUNNEL_RECURSION_LIMIT) to prevent overflow. Add recursion detection using dev_xmit_recursion helpers directly in iptunnel_xmit() and ip6tunnel_xmit() to cover all IPv4/IPv6 tunnel paths including UDP encapsulated tunnels (VXLAN, Geneve, etc.). Move dev_xmit_recursion helpers from net/core/dev.h to public header include/linux/netdevice.h so they can be used by tunnel code. BUG: KASAN: stack-out-of-bounds in blake2s.constprop.0+0xe7/0x160 Write of size 32 at addr ffff88810033fed0 by task kworker/0:1/11 Workqueue: mld mld_ifc_work Call Trace: <TASK> __build_flow_key.constprop.0 (net/ipv4/route.c:515) ip_rt_update_pmtu (net/ipv4/route.c:1073) iptunnel_xmit (net/ipv4/ip_tunnel_core.c:84) ip_tunnel_xmit (net/ipv4/ip_tunnel.c:847) gre_tap_xmit (net/ipv4/ip_gre.c:779) dev_hard_start_xmit (net/core/dev.c:3887) sch_direct_xmit (net/sched/sch_generic.c:347) __dev_queue_xmit (net/core/dev.c:4802) bond_dev_queue_xmit (drivers/net/bonding/bond_main.c:312) bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5279) bond_start_xmit (drivers/net/bonding/bond_main.c:5530) dev_hard_start_xmit (net/core/dev.c:3887) __dev_queue_xmit (net/core/dev.c:4841) ip_finish_output2 (net/ipv4/ip_output.c:237) ip_output (net/ipv4/ip_output.c:438) iptunnel_xmit (net/ipv4/ip_t

    Засегнати продукти

    • Linux Linux: 745e20f1b626b1be4b100af5d4bf7b3439392f8f преди da5f0166cef3d4285ddbb1b638661263fc03ee92; 745e20f1b626b1be4b100af5d4bf7b3439392f8f преди 834c4f645726a25fd71ea50cdfb5c135f8f95d85; 745e20f1b626b1be4b100af5d4bf7b3439392f8f преди 8a57deeb256069f262957d8012418559ff66c385; 745e20f1b626b1be4b100af5d4bf7b3439392f8f преди b56b8d19bd05e2a8338385c770bc2b60590bc81e; 745e20f1b626b1be4b100af5d4bf7b3439392f8f преди 6f1a9140ecda3baba3d945b9a6155af4268aafc4; 3f266b04185de51d8e6446eb1fccec3b5e7ce575; 2.6.35.9 преди 2.6.36
    • Linux Linux: 2.6.37; преди 2.6.37; 6.6.160 до 6.6.*; 6.12.78 до 6.12.*; 6.18.19 до 6.18.*; 6.19.9 до 6.19.*; от 7.0 нататък

    История

    • 20 март 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-23276: Linux | freedomonline.bg