<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif"><br>Hi and G'day <br><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">I hope, that it's a good place to ask another question about Linux kernel. As we know kernel-team mailing list is used to coordinate and plan kernel uploads for Ubuntu etc. But my question is related to system security. <br><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">So; let say, that after a couple of kernel updates (of course, with plenty of security issues fixed) there are - for example - three 'old' kernels: one currently used and <span id="result_box" class="short_text" lang="en"><span class="">and three</span> <span class="">previous versions. An example: <br><br>[~]$ dpkg -l |grep linux-image-3.2 |wc -l <br>4 <br><br>What user should do in such situation: he should remove an 'old' kernels (simple, because they are vulnerable and have unpatched security issues etc.) or he can keep those kernels as long, as there is enough space on the /boot partition (if there is such a partition) or, at last when he decide to do it - remove? <br><br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif"><span id="result_box" class="short_text" lang="en"><span class="">Generally: it is secure to keep more than one, patched kernel? Is there any chance, that an 'older' kernel versions could affect the safety of the system? If after kernel update everything is working okay... I see no reason to keep more than this one. But that's only my personal opinion. <br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br>Whether the older kernel versions, can be used in some way by an attacker? Of course if he manage to break in to the system etc. I apologize for such naive questions.<br><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Best regards.<br><br><br></div></div>