CVE-2024-38580: epoll: be better about file lifetimes
First published: Wed Jun 19 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.15.161 | 5.15.161 |
| redhat/kernel | <6.1.93 | 6.1.93 |
| redhat/kernel | <6.6.33 | 6.6.33 |
| redhat/kernel | <6.8.12 | 6.8.12 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.11.10-1 6.12.3-1 |
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Reference Links
- https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d
- https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b
- https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2
- https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784
- https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e
- https://launchpad.net/bugs/cve/CVE-2024-38580
- https://access.redhat.com/security/cve/CVE-2024-38580
- https://lore.kernel.org/linux-cve-announce/2024061948-CVE-2024-38580-d87f@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2293413
- https://access.redhat.com/errata/RHSA-2024:4928
- https://bugzilla.redhat.com/show_bug.cgi?id=2293412
- https://git.kernel.org/linus/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b
- https://security-tracker.debian.org/tracker/CVE-2024-38580
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38580
- https://nvd.nist.gov/vuln/detail/CVE-2024-38580
- https://ubuntu.com/security/CVE-2024-38580
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