CVE-2026-81008
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
A use-after-free vulnerability exists in the Linux kernel's icc_get() and of_icc_get_by_index() functions. When memory allocation for path->name fails, the error path calls kfree(path) without removing the path's requests from the req_list, leaving dangling pointers that can be dereferenced later. The fix replaces kfree(path) with icc_put(path) and ensures the icc_lock mutex is released before calling icc_put().
Risk Assessment
This vulnerability can lead to kernel memory corruption, system crashes (panic), or potentially arbitrary code execution in kernel context. In multi-tenant or high-load environments, it could be exploited for privilege escalation.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit referenced in the CVE). If updating is not possible, restrict access to debugfs interfaces and monitor the system for abnormal interconnect-related behavior.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: interconnect: Fix use after free in icc_get() and of_icc_get_by_index() In of_icc_get_by_index() and icc_get(), if the dynamic allocation for path->name fails via kasprintf(), the error handling path directly calls kfree(path) to free the path object and returns an error. However, prior to this point, path_find() calls path_init(), which already links the path's requests into the req_list of the respective interconnect nodes via hlist_add_head(). Directly invoking kfree(path) leaves dangling pointers in the hlist. A subsequent call to icc_get() or icc_set_bw() will traverse or modify these corrupted lists, triggering a slab use afterfree. KASAN report showing the vulnerability when reproducing via debugfs: BUG: KASAN: slab-use-after-free in path_find+0x6f8/0xcfc Write of size 8 at addr fff000000d43f748 by task sh/1 ... Call trace: kasan_report+0xac/0xfc path_find+0x6f8/0xcfc icc_get+0x148/0x380 icc_get_set+0xf8/0x2d0 ... Freed by task 1: kfree+0x1a0/0x4a4 icc_get+0x2cc/0x380 icc_get_set+0xf8/0x2d0 Fix this by replacing kfree(path) with the proper teardown function, icc_put(path), which safely removes the requests from the req_list using hlist_del() and drops the provider usage references before freeing the memory. Additionally, in icc_get(), ensure that the icc_lock mutex is released prior to calling icc_put(path) to avoid a deadlock, as icc_put() internally acquires the same lock.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS