Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Reject dir_len < 4 to prevent size_t underflow On the non-root path, __tb_property_parse_dir() takes dir_len from entry->length (u16 widened to size_t). Two distinct OOB conditions follow when entry->length < 4: 1. The non-root path begins with kmemdup(&block[dir_offset], sizeof(*dir->uuid), ...) which always reads 4 dwords from dir_offset. tb_property_entry_valid() only enforces dir_offset + entry->length <= block_len, so a crafted entry with dir_offset close to the end of the property block and entry->length in 0..3 passes that gate but lets the UUID copy run off the block (e.g. dir_offset = 497, dir_len = 3 in a 500-dword block reads block[497..501]). 2. After the kmemdup, content_len = dir_len - 4 underflows size_t to ~SIZE_MAX, nentries becomes SIZE_MAX / 4, and the entry walk runs OOB on each iteration until an entry fails validation or the kernel oopses on an unmapped page. Reject dir_len < 4 on the non-root path *before* the UUID kmemdup, which closes both holes. Also move INIT_LIST_HEAD(&dir->properties) up to immediately after the dir allocation so the new error-return path (and the existing uuid-alloc failure path) calling tb_property_free_dir() sees a walkable list rather than the zero-initialized NULL next/prev that list_for_each_entry_safe() would oops on.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before 37abc4504fa19d8f9f1e87792e8a2b8fdb308e40; affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before e2d4d51cf5785815fa4e91e0c019e3eb2506a84c; affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before de618299190b418291609e6921557253bd417e25; affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before 5506c825f14d810f0690b1f4367cb7249ebb387a; affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before 542a13890b742099c461d70920e97b14e568f6ec; affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before d548179adcc87e1bc66b17e00352a1f536e76065; affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before 3bec49ca55e08fb085cc4318f24b1b37eaab28cb; affected cdae7c07e3e3509eaabc18c1640a55dc5b99c179 before de21b59c29e31c5108ddc04210631bbfab81b997 |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; unaffected 5.10.259 through 5.10.*; unaffected 5.15.210 through 5.15.*; unaffected 6.1.176 through 6.1.*; unaffected 6.6.143 through 6.6.*; unaffected 6.12.93 through 6.12.*; unaffected 6.18.35 through 6.18.*; unaffected 7.0.12 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/37abc4504fa19d8f9f1e87792e8a2b8fdb308e40
- https://git.kernel.org/stable/c/e2d4d51cf5785815fa4e91e0c019e3eb2506a84c
- https://git.kernel.org/stable/c/de618299190b418291609e6921557253bd417e25
- https://git.kernel.org/stable/c/5506c825f14d810f0690b1f4367cb7249ebb387a
- https://git.kernel.org/stable/c/542a13890b742099c461d70920e97b14e568f6ec
- https://git.kernel.org/stable/c/d548179adcc87e1bc66b17e00352a1f536e76065
- https://git.kernel.org/stable/c/3bec49ca55e08fb085cc4318f24b1b37eaab28cb
- https://git.kernel.org/stable/c/de21b59c29e31c5108ddc04210631bbfab81b997