CVE-2026-23389: 
Linux Kernel vulnerability analysis and mitigation

CVE-2026-23389 is a memory leak vulnerability in the Linux kernel's ice_set_ringparam() function, affecting the Intel ice network driver. The flaw was discovered via static analysis and code review, and publicly disclosed on March 25, 2026. Affected kernel versions span from 4.17.1 up to (but not including) 6.12.81, versions 6.13 through 6.18.21, and versions 6.19 through 6.19.6, as well as development releases 7.0-rc1 through 7.0-rc7. It carries a CVSS v3.1 base score of 5.5 (Medium) (Red Hat Advisory, Red Hat Bugzilla).

The root cause is improper memory management (CWE-401: Missing Release of Memory after Effective Lifetime; CWE-763: Release of Invalid Pointer or Reference) in the ice_set_ringparam() function of the Linux kernel's ice driver. In the function, tx_rings and xdp_rings are allocated before rx_rings; if rx_rings allocation fails, execution jumps to the done label without freeing the previously allocated tx_rings and xdp_rings. Additionally, if setup of an individual Rx ring fails during the configuration loop, the code jumps to the free_tx label, which releases tx_rings but leaks xdp_rings. The fix introduces a free_xdp label to ensure all allocated ring buffers are properly freed on all error paths (Red Hat Bugzilla).

Exploitation of this vulnerability allows a local, low-privileged attacker to trigger kernel memory leaks by repeatedly invoking ring parameter configuration on an ice-driver network interface, gradually exhausting kernel memory. Over time, this can lead to denial of service conditions including system unresponsiveness or crashes due to out-of-memory (OOM) conditions. There is no confidentiality or integrity impact; the vulnerability is limited to availability (Red Hat Advisory).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of disclosure. The EPSS score is approximately 0.018% (0.000180), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires local access and low privileges, limiting the practical attack surface (Red Hat Advisory).

Upgrade to a patched Linux kernel version: 6.12.81 or later (for the 4.17.1–6.12.x branch), 6.18.22 or later (for the 6.13–6.18.x branch), or 6.19.7 or later (for the 6.19.x branch). Development branch users should use 7.0-rc3 or later. Patches are available via the upstream kernel stable tree. If immediate patching is not feasible, restrict local user access to systems running affected kernels and monitor memory usage for unexpected depletion. Debian has also accepted the fix into its stable and backports repositories (Red Hat Advisory, Red Hat Bugzilla).