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CVE-2026-80731: Linux

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.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header dev_validate_header() reads dev->hard_header_len directly when zero-padding short link layer headers for CAP_SYS_RAWIO holders: if (capable(CAP_SYS_RAWIO)) { memset(ll_header + len, 0, dev->hard_header_len - len); return true; } Packet send paths call dev_validate_header() on skbs whose headroom was allocated from an earlier hard_header_len read. If the device is reconfigured so that dev->hard_header_len increases before validation, the memset writes past the reserved buffer, an out-of-bounds write. This out-of-bounds write is masked in some SOCK_RAW paths today because the same concurrent increase can first make skb_push() exceed the reserved headroom and trigger skb_under_panic(). Remove the zero-padding branch before making those hard_header_len reads consistent, so the snapshot fixes do not turn a loud panic into a silent overwrite. This path is only reached for variable length L2 protocols, where len < hard_header_len but len >= min_header_len. No remaining in-tree variable length L2 protocol implements header_ops->validate, and the CAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no real value beyond allowing testing of intentionally malformed input. Drop the CAP_SYS_RAWIO branch. The remaining reads of dev->hard_header_len in dev_validate_header() are comparisons only and have no memory safety impact.

Засегнати продукти

  • Linux Linux: b5518429e70cd783b8ca52335456172c1a0589f6 преди 53fd7f912c0877647d6a1e1877f5ea8535ee0b4a; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди 8fc9816404166a90ed8d544dc52482fafffb6d9f; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди b0f92a5731dc82556a9ae005cc35f71ab136307b; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди 99df6b7a713f96eda206680d100b76e15f9d9b69; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди 74e035f07f53feca09e2352e77fccb09cad5e208; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди dbb30dc943a93e083f1e531bfdc6779e57de40d0; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди fc902f52a02298c7432b2334c0c82a2885a1a8b6; 2793a23aacbd754dbbb5cb75093deb7e4103bace преди 3b9a324e646d3657a8d9806dfbfe4f3e4066e882; f58a6c08ebdfa978178bbca78c2ba744a2665912; 1df16498dfd0d5a129bdf2982d9a08df73e8923d; 8b8d278aa4de9335682bbd4a3bb619af015c859e; 6804052fa9d86e9a512c88b24a5debbfc1a490fc; 3.2.80 преди 3.2.81; 3.16.36 преди 3.17; 4.1.28 преди 4.2; 4.4.8 преди 4.5; 4.5.2 преди 4.6
  • Linux Linux: 4.6; преди 4.6; 3.2.81 до 3.2.*; 5.10.265 до 5.10.*; 5.15.216 до 5.15.*; 6.1.183 до 6.1.*; 6.6.152 до 6.6.*; 6.12.104 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; от 7.2 нататък

История

  • 3 септември 2026 Публикувано

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