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Microsoft issued a critical patch for two vulnerabilities in the core graphics subsystem of Windows, one of eight fixes released Tuesday as part of its monthly security updates.Microsoft released a total of five critical patches in its April security bulletin. Two of them fix bugs in Windows, two fix bugs in Windows and Internet Explorer (IE), and one fixes a vulnerability in Microsoft Office. The critical rating means an attacker could potentially exploit the flaws to hack into a victim's computer.
The other patches fix vulnerabilities in Windows and Office and were rated "important." Microsoft releases patches on the second Tuesday of every month, which has become known in the industry as "Patch Tuesday."
Microsoft Fixes Critical Bugs on 'Patch Tuesday' [pcworld.com]
I still do not know why they can't do updates as they happen just like AV software.
I hadn't read it before, but there's an entire article about Patch Tuesday on Wikipedia [en.wikipedia.org].
I still do not know why they can't do updates as they happen just like AV software.
The size and complexity of OS patches is (or can be) far greater than anti-virus software. I've never studied AV software in depth, but I think most updates only affect the virus definition database. Something like that is easy, you don't have to perform compatibility tests, etc. However, when you are updating operating system program code, there is a potential that it will kill systems stone dead if you get it wrong. This being the case, a monthly cycle is reasonable.
Kaled.