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CVE-2026-64114: Linux, невалидиран вход

7.8

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 локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: ipv4: raw: reject IP_HDRINCL packets with ihl < 5 raw_send_hdrinc() validates that the caller-supplied IPv4 header fits within the message length: iphlen = iph->ihl * 4; err = -EINVAL; if (iphlen > length) goto error_free; if (iphlen >= sizeof(*iph)) { /* fix up saddr, tot_len, id, csum, transport_header */ } It does not, however, reject ihl < 5. For such a packet the "if (iphlen >= sizeof(*iph))" branch is skipped, leaving the crafted iphdr untouched, but the packet is still handed to __ip_local_out() and onward. Downstream consumers that read iph->ihl assume a sane value: net/ipv4/ah4.c:ah_output() in particular subtracts sizeof(struct iphdr) from top_iph->ihl * 4 and passes the (signed-int-negative, then cast to size_t) result to memcpy(), producing an OOB access of length close to SIZE_MAX and a host kernel panic. An IPv4 header with ihl < 5 is malformed by definition (RFC 791: "Internet Header Length is the length of the internet header in 32 bit words ... Note that the minimum value for a correct header is 5."). The kernel should not be willing to inject such a packet into its own output path. Reject "iphlen < sizeof(*iph)" alongside the existing "iphlen > length" check. This matches the principle that locally constructed packets that re-enter the IP stack must pass the same basic sanity tests that a foreign packet would be subjected to. Once this lands, the "if (iphlen >= sizeof(*iph))" wrapper around the fixup branch becomes redundant; left in place to keep the patch minimal and backport-friendly. A follow-up can unwrap it. Note that commit 86f4c90a1c5c ("ipv4, ipv6: ensure raw socket message is big enough to hold an IP header") ensures the message buffer is large enough to hold an iphdr, but does not constrain the self-reported iph->ihl. Reachability: the malformed packet source is any caller with CAP_NET_RAW, including an unprivileged proc

Засегнати продукти

  • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 1065b9efa4126df559b03a849c139ecfae92cd25; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди bc20dbd48c26e743f7e0845020c11ed2ce8b15ee; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 5a564f737ec54d63e8ee221d3ff396d07586d464; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 3c5411fa4944ed99af3d9d1de750ea8169b6dac9; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 145e9afa5b905229b4788bb72c3255f5a5f77508; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 7725cd3b471740fd23d25ed1da722c671fb2a5d3; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди bbe0be67de296176e7243c76e3d9f02f6ae9ff0b; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 915fab69823a14c170dbaa3b41978768e0fe62fc
  • Linux Linux: 2.6.12; преди 2.6.12; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.142 до 6.6.*; 6.12.92 до 6.12.*; 6.18.34 до 6.18.*; 7.0.11 до 7.0.*; 7.1 до *

Вид слабост

История

  • 19 юли 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-64114: Linux, невалидиран вход | freedomonline.bg