CVE-2025-40306
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel's OrangeFS (orangefs) filesystem driver, a buffer overflow vulnerability was found in extended attribute (xattr) handling. The helper function `xattr_key()` incorrectly checks the loop condition, causing an infinite loop and potential system hang. Additionally, incorrect use of the `hash_add` macro led to memory leaks and unfreed allocations.
Risk Assessment
An attacker can exploit this vulnerability to cause a denial of service (DoS) by hanging a kernel thread or exhausting memory (OOM), destabilizing the system and user applications.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit in the stable branch). If an update is not possible, temporarily restrict access to the OrangeFS filesystem or disable extended attribute support.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: orangefs: fix xattr related buffer overflow... Willy Tarreau <[email protected]> forwarded me a message from Disclosure <[email protected]> with the following warning: > The helper `xattr_key()` uses the pointer variable in the loop condition > rather than dereferencing it. As `key` is incremented, it remains non-NULL > (until it runs into unmapped memory), so the loop does not terminate on > valid C strings and will walk memory indefinitely, consuming CPU or hanging > the thread. I easily reproduced this with setfattr and getfattr, causing a kernel oops, hung user processes and corrupted orangefs files. Disclosure sent along a diff (not a patch) with a suggested fix, which I based this patch on. After xattr_key started working right, xfstest generic/069 exposed an xattr related memory leak that lead to OOM. xattr_key returns a hashed key. When adding xattrs to the orangefs xattr cache, orangefs used hash_add, a kernel hashing macro. hash_add also hashes the key using hash_log which resulted in additions to the xattr cache going to the wrong hash bucket. generic/069 tortures a single file and orangefs does a getattr for the xattr "security.capability" every time. Orangefs negative caches on xattrs which includes a kmalloc. Since adds to the xattr cache were going to the wrong bucket, every getattr for "security.capability" resulted in another kmalloc, none of which were ever freed. I changed the two uses of hash_add to hlist_add_head instead and the memory leak ceased and generic/069 quit throwing furniture.