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.

An update of the linux package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-80979)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
375048	Photon OS 5.0: Linux PHSA-2026-5.0-92-0999	Nessus	PhotonOS Local Security Checks	Local	high
375011	Photon OS 5.0: Linux PHSA-2026-5.0-91-0999	Nessus	PhotonOS Local Security Checks	Local	high
366742	SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:4706-1)	Nessus	SuSE Local Security Checks	Local	high
362907	Debian dla-4817 : ata-modules-6.12.107+deb12-armmp-di - security update	Nessus	Debian Local Security Checks	Local	high
351155	Debian dsa-6528 : ata-modules-6.12.111+deb13-armmp-di - security update	Nessus	Debian Local Security Checks	Local	high
345423	Linux Distros Unpatched Vulnerability : CVE-2026-80979	Nessus	Misc.	Local	high

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CVE-2026-80979

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