Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 559214eb4e5c3d05e69428af2fae2691ba1eb784; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4f65f4defe4e23659275ce5153541cd4f76ce2d2; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 16e3182f6322575eb7c12e728ad3c7986a189d5d; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4efaa5acf0a1d2b5947f98abb3acf8bfd966422b |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.15.161 through 5.15.*; unaffected 6.1.93 through 6.1.*; unaffected 6.6.33 through 6.6.*; unaffected 6.8.12 through 6.8.*; unaffected 6.9 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
- 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
No English description supplied.
No references supplied.