Description
In the Linux kernel, the following vulnerability has been resolved: epoll: be better about file lifetimes epoll can call out to vfs_poll() with a file pointer that may race with the last 'fput()'. That would make f_count go down to zero, and while the ep->mtx locking means that the resulting file pointer tear-down will be blocked until the poll returns, it means that f_count is already dead, and any use of it won't actually get a reference to the file any more: it's dead regardless. Make sure we have a valid ref on the file pointer before we call down to vfs_poll() from the epoll routines.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < cbfd1088e24ec4c1199756a37cb8e4cd0a4b016eaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 559214eb4e5c3d05e69428af2fae2691ba1eb784affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4f65f4defe4e23659275ce5153541cd4f76ce2d2affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 16e3182f6322575eb7c12e728ad3c7986a189d5daffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4efaa5acf0a1d2b5947f98abb3acf8bfd966422baffected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.15.161 to ≤ 5.15.*unaffected6.1.93 to ≤ 6.1.*unaffected6.6.33 to ≤ 6.6.*unaffected6.8.12 to ≤ 6.8.*unaffected6.9 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e ↗
- https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784 ↗
- https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2 ↗
- https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d ↗
- https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b ↗