CVE-2024-26689 (GCVE-0-2024-26689)
Vulnerability from cvelistv5
Published
2024-04-03 14:54
Modified
2026-05-11 20:02
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9030aaf9bf0a1eee47a154c316c789e959638b0f
Version: 9030aaf9bf0a1eee47a154c316c789e959638b0f
Version: 9030aaf9bf0a1eee47a154c316c789e959638b0f
Version: 9030aaf9bf0a1eee47a154c316c789e959638b0f
Version: 9030aaf9bf0a1eee47a154c316c789e959638b0f
Version: 9030aaf9bf0a1eee47a154c316c789e959638b0f
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