CVE-2024-26689: ceph: prevent use-after-free in encode_cap_msg()
First published: Wed Apr 03 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <5.10.210 | |
| Linux Linux kernel | >=5.11<5.15.149 | |
| Linux Linux kernel | >=5.16<6.1.79 | |
| Linux Linux kernel | >=6.2<6.6.18 | |
| Linux Linux kernel | >=6.7<6.7.6 | |
| Linux Linux kernel | =6.8-rc1 | |
| Linux Linux kernel | =6.8-rc2 | |
| Linux Linux kernel | =6.8-rc3 | |
| Debian Debian Linux | =10.0 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
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Reference Links
- https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77
- https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc
- https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214
- https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7
- https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef
- https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139
- https://launchpad.net/bugs/cve/CVE-2024-26689
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26689
- https://nvd.nist.gov/vuln/detail/CVE-2024-26689
- https://security-tracker.debian.org/tracker/CVE-2024-26689
- https://ubuntu.com/security/CVE-2024-26689
- https://git.kernel.org/linus/cda4672da1c26835dcbd7aec2bfed954eda9b5ef
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