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CVE-2026-63888 is a memory-safety vulnerability in the Linux kernel SCSI target iSCSI Text-phase handler, specifically in iscsit_handle_text_cmd(). It comprises two long-standing flaws introduced with the original LIO iSCSI target integration. First, when DataDigest is negotiated, the handler allocates the text buffer at ALIGN(payload_length, 4) but later increments rx_size by the digest length and passes that inflated size to iscsit_crc_buf(). As a result, crc32c() processes 4 bytes past the end of the allocated text_in buffer, causing a slab out-of-bounds read on Text PDUs using DataDigest=CRC32C. Second, on a DataDigest mismatch when ErrorRecoveryLevel is greater than 0, the handler frees text_in and returns without clearing cmd->text_in_ptr. That stale pointer can then be freed again by iscsit_setup_text_cmd() on a subsequent Text Request using the same ITT, or during session teardown in iscsit_release_cmd(), resulting in a double-free. The upstream fix passes the actual padded payload length to the CRC routine and clears cmd->text_in_ptr after freeing the buffer in the error-recovery drop path.
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A Linux kernel iSCSI target vulnerability in iscsit_handle_text_cmd() involving a 4-byte CRC buffer overread and a stale pointer double-free in the Text-phase handler, which can lead to slab corruption or a remote kernel BUG on hardened systems.
A Linux kernel iSCSI target vulnerability involving CRC overread and double-free in iscsit_handle_text_cmd().
A specific vulnerability affecting Red Hat Enterprise Linux 10.2 kernel-related packages; the content does not provide technical details beyond listing it in the advisory.
A Linux kernel vulnerability in the SCSI target iSCSI component involving CRC overread and double-free in iscsit_handle_text_cmd().
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Cross-references every affected SKU, including bundled OEM variants.
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