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.

  - smb: client: fix krb5 mount with username option Customer reported that some of their krb5 mounts were     failing against a single server as the client was trying to mount the shares with wrong credentials. It     turned out the client was reusing SMB session from first mount to try mounting the other shares, even     though a different username= option had been specified to the other mounts. By using username mount option     along with sec=krb5 to search for principals from keytab is supported by cifs.upcall(8) since cifs-     utils-4.8. So fix this by matching username mount option in match_session() even with Kerberos. For     example, the second mount below should fail with -ENOKEY as there is no 'foobar' principal in keytab     (/etc/krb5.keytab). The client ends up reusing SMB session from first mount to perform the second one,     which is wrong. ``` $ ktutil ktutil: add_entry -password -p testuser -k 1 -e aes256-cts Password for     testuser@ZELDA.TEST: ktutil: write_kt /etc/krb5.keytab ktutil: quit $ klist -ke Keytab name:
    FILE:/etc/krb5.keytab KVNO Principal ---- ----------------------------------------------------------------     1 testuser@ZELDA.TEST (aes256-cts-hmac-sha1-96) $ mount.cifs //w22-root2/scratch /mnt/1 -o     sec=krb5,username=testuser $ mount.cifs //w22-root2/scratch /mnt/2 -o sec=krb5,username=foobar $ mount -t     cifs | grep -Po 'username=\K\w+' testuser testuser ``` (CVE-2026-31392)

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

ID	Name	Product	Family	Published	Updated	Severity
306005	Photon OS 5.0: Linux PHSA-2026-5.0-0813	Nessus	PhotonOS Local Security Checks	4/11/2026	4/27/2026	high
304921	Linux Distros Unpatched Vulnerability : CVE-2026-31392	Nessus	Misc.	4/5/2026	4/7/2026	medium
306997	Photon OS 4.0: Linux PHSA-2026-4.0-0998	Nessus	PhotonOS Local Security Checks	4/17/2026	4/17/2026	medium

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