CVE-2026-80979
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel's net/smc subsystem, smc_conn_free() unregisters the connection only while the link group is still on its device list and never sets conn->killed. In the window between unlinking the group and killing its connections, the device can re-arm the receive tasklet after tasklet_kill() has returned, leading to a use-after-free.
Risk Assessment
A use-after-free in the SMC receive path can cause a kernel crash or potentially code execution. It affects systems using SMC with ISM/DMB support.
Recommendation
Update the Linux kernel to a version with the fix that unconditionally unregisters the connection and drains the tasklet before detaching, and clears sndbuf_desc before freeing it. Until patched, consider limiting SMC usage.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net/smc: unregister the connection before draining the rx tasklet smc_conn_free() calls smc_ism_unset_conn() only while the link group is still on its device list, and never sets conn->killed. smc_lgr_terminate_sched() unlinks the group immediately and defers killing its connections to a work item, so a connection freed in that window keeps its smcd->conn[] slot with both gates in smcd_handle_irq() open, and the device can re-arm the receive tasklet after tasklet_kill() has returned. On the DMB-nocopy path the ghost send buffer is freed right after that drain, so the re-armed tasklet dereferences it. Unregister unconditionally and drain before the detach at both teardown sites, mirroring rmb_desc, which smc_buf_unuse() releases after the drain. Clear conn->sndbuf_desc before freeing it as well, so a reader that samples the pointer cannot get one that is already freed.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS