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.

https://git.kernel.org/stable/c/37abc4504fa19d8f9f1e87792e8a2b8fdb308e40

https://git.kernel.org/stable/c/3bec49ca55e08fb085cc4318f24b1b37eaab28cb

https://git.kernel.org/stable/c/542a13890b742099c461d70920e97b14e568f6ec

https://git.kernel.org/stable/c/5506c825f14d810f0690b1f4367cb7249ebb387a

https://git.kernel.org/stable/c/d548179adcc87e1bc66b17e00352a1f536e76065

https://git.kernel.org/stable/c/de21b59c29e31c5108ddc04210631bbfab81b997

https://git.kernel.org/stable/c/de618299190b418291609e6921557253bd417e25

https://git.kernel.org/stable/c/e2d4d51cf5785815fa4e91e0c019e3eb2506a84c

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["drivers/thunderbolt/property.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"37abc4504fa19d8f9f1e87792e8a2b8fdb308e40","versionType":"git","status":"affected"},{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"e2d4d51cf5785815fa4e91e0c019e3eb2506a84c","versionType":"git","status":"affected"},{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"de618299190b418291609e6921557253bd417e25","versionType":"git","status":"affected"},{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"5506c825f14d810f0690b1f4367cb7249ebb387a","versionType":"git","status":"affected"},{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"542a13890b742099c461d70920e97b14e568f6ec","versionType":"git","status":"affected"},{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"d548179adcc87e1bc66b17e00352a1f536e76065","versionType":"git","status":"affected"},{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"3bec49ca55e08fb085cc4318f24b1b37eaab28cb","versionType":"git","status":"affected"},{"version":"cdae7c07e3e3509eaabc18c1640a55dc5b99c179","lessThan":"de21b59c29e31c5108ddc04210631bbfab81b997","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["drivers/thunderbolt/property.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"4.15","status":"affected"},{"version":"0","lessThan":"4.15","versionType":"semver","status":"unaffected"},{"version":"5.10.259","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.210","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.176","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.143","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.93","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.35","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.0.12","lessThanOrEqual":"7.0.*","versionType":"semver","status":"unaffected"},{"version":"7.1","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]