CVE - CVE-2024-26689

CVE-ID
CVE-2024-26689	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77 URL:https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77 MISC:https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc URL:https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc MISC:https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214 URL:https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214 MISC:https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7 URL:https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7 MISC:https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef URL:https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef MISC:https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139 URL:https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139
Assigning CNA
kernel.org
Date Record Created
20240219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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