CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: xfrm: Check for underflow in xfrm_state_mtu Leo Lin reported OOB write issue in esp component: xfrm_state_mtu() returns u32 but performs its arithmetic in unsigned modulo-2^32 space using an attacker-influenced "header_len + authsize + net_adj" subtracted from a small "mtu" argument. A nobody user can install an IPv4 ESP tunnel SA with a large authentication key (XFRMA_ALG_AUTH_TRUNC, e.g. hmac(sha512), 64-byte key, 64-byte trunc), configure a small interface MTU (68 bytes), and set XFRMA_TFCPAD to a large value. When a single UDP datagram is then sent through the tunnel, xfrm_state_mtu() underflows to a near-2^32 value, and esp_output() consumes it as a signed int via: padto = min(x->tfcpad, xfrm_state_mtu(x, mtu_cached)) esp.tfclen = padto - skb->len (assigned to int) esp.tfclen ends up negative (e.g. -207). It is sign-extended to size_t when passed to memset() inside esp_output_fill_trailer(), producing a ~16 EB write of zeroes at skb_tail_pointer(skb). KASAN logs it as "Write of size 18446744073709551537 at addr ffff888...". Check for underflow and return 1. This causes the sendmsg attempt to fail with ENETUNREACH.
Засегнати продукти
- Linux Linux: c5c2523893747f88a83376abad310c8ad13f7197 преди 8014f70c4e6e5ab101ae3860a614e65e988372e3; c5c2523893747f88a83376abad310c8ad13f7197 преди 1021d2877b689a648b27815c854557a917122e93; c5c2523893747f88a83376abad310c8ad13f7197 преди 2a41b1b31c61c52b972278ce1732a1443f5e89ed; c5c2523893747f88a83376abad310c8ad13f7197 преди fccd685b32df5aaf6bad4381eeda216468e283f0; c5c2523893747f88a83376abad310c8ad13f7197 преди 820e501be8aee4b365d218d83227b314309c5fda; c5c2523893747f88a83376abad310c8ad13f7197 преди 82ac903e0b519849647657b8c48d21237ada06a2; c5c2523893747f88a83376abad310c8ad13f7197 преди 3db50ceeacb52806d8fe86fb1dfe944df0b9f789; c5c2523893747f88a83376abad310c8ad13f7197 преди 742b04d0550b0ec89dcbc99537ec88653bd1ad90
- Linux Linux: 2.6.22; преди 2.6.22; 5.10.259 до 5.10.*; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.143 до 6.6.*; 6.12.93 до 6.12.*; 6.18.35 до 6.18.*; 7.0.12 до 7.0.*; от 7.1 нататък
Вид слабост
История
- 19 юли 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-64009
- https://nvd.nist.gov/vuln/detail/CVE-2026-64009
- https://git.kernel.org/stable/c/8014f70c4e6e5ab101ae3860a614e65e988372e3
- https://git.kernel.org/stable/c/1021d2877b689a648b27815c854557a917122e93
- https://git.kernel.org/stable/c/2a41b1b31c61c52b972278ce1732a1443f5e89ed
- https://git.kernel.org/stable/c/fccd685b32df5aaf6bad4381eeda216468e283f0
- https://git.kernel.org/stable/c/820e501be8aee4b365d218d83227b314309c5fda
- https://git.kernel.org/stable/c/82ac903e0b519849647657b8c48d21237ada06a2
- https://git.kernel.org/stable/c/3db50ceeacb52806d8fe86fb1dfe944df0b9f789
- https://git.kernel.org/stable/c/742b04d0550b0ec89dcbc99537ec88653bd1ad90