Kritik CVSS 9.8

CVE-2026-43037: Linux Kernel: sınır dışı yazma

Yayın: 1 Mayıs 2026 18:16 · Güncelleme: 6 Kasım 2026 10:18

Açıklama (NVD)

In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() Oskar Kjos reported the following problem. ip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written by the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes IPCB(skb2) to __ip_options_echo(), which interprets that cb[] region as struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff at offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr value. __ip_options_echo() then reads optlen from attacker-controlled packet data at sptr[rr+1] and copies that many bytes into dopt->__data, a fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE). To fix this we clear skb2->cb[], as suggested by Oskar Kjos. Also add minimal IPv4 header validation (version == 4, ihl >= 5).

Özet bilgiler

Ürün: Linux Linux Kernel
CVSS v3.1: 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: %0,69 (yüzdelik 53)
CWE: CWE-787
Yama: Mevcut

Etkilenen sürümler

Ürün	Başlangıç	Bitiş	Düzeltildi
linux-linux-kernel	2.6.22	—	5.10.253
linux-linux-kernel	5.11	—	5.15.203
linux-linux-kernel	5.16	—	6.1.168
linux-linux-kernel	6.2	—	6.6.134
linux-linux-kernel	6.7	—	6.12.81
linux-linux-kernel	6.13	—	6.18.22
linux-linux-kernel	6.19	—	6.19.12
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—

Kaynaklar

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