CVE-2026-97605
UnknownSummary
In the Linux kernel, the EROFS filesystem has a vulnerability in LZMA decoder pool resizing. On partial allocation failure, a broken stream remains in an inconsistent state, potentially passing NULL to xz_dec_microlzma_reset().
Risk Assessment
An attacker could trigger a kernel panic or undefined behavior, leading to denial of service (DoS).
Recommendation
Apply the Linux kernel update containing the fix that reorders allocation and updates the global limit only after full success.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: erofs: preserve LZMA decoders on resize failure The pool-resize path frees each stream's old decoder before allocating its replacement. If an allocation fails after some streams have already been replaced, the failed stream is put back on the list with state == NULL. z_erofs_lzma_max_dictsize is still advanced as if the whole pool had been resized. An existing LZMA mount can select the broken stream and pass NULL to xz_dec_microlzma_reset(). A retry at the same size also skip another resize attempt. Since the global maximum was advanced, thus, the invalid state is left unrepaired. Allocate each replacement before freeing the old decoder, temporarily retaining one old decoder during allocation. Stop at the first failure and advance z_erofs_lzma_max_dictsize only after all streams satisfy the request. Record each stream's dictionary capacity so retries can skip streams already enlarged before a partial failure.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS