CVE-2026-68269: drm/i915/gem: Add missing nospec on parallel submit slot

From: Greg Kroah-Hartman <[email protected]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

drm/i915/gem: Add missing nospec on parallel submit slot

Add missing Spectre mitigation for userspace controlled parallel
submission slot.

Discovered using AI-assisted static analysis confirmed by Intel
Product Security.

(cherry picked from commit 15b9353deff3cf72331c387780de3cf9c316b643)

The Linux kernel CVE team has assigned CVE-2026-68269 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.16 with commit e5e32171a2cf1e434d4f88e12467f3e47d0ec618 and fixed in 6.6.148 with commit 4a27275d275971c9ea29d3d240ea4a224ad368a2
	Issue introduced in 5.16 with commit e5e32171a2cf1e434d4f88e12467f3e47d0ec618 and fixed in 6.12.101 with commit be393175306694de5da1d1a23a8ea4149baa09f1
	Issue introduced in 5.16 with commit e5e32171a2cf1e434d4f88e12467f3e47d0ec618 and fixed in 6.18.42 with commit 45db277b2e1e34bcc99a0852026791108339ec3e
	Issue introduced in 5.16 with commit e5e32171a2cf1e434d4f88e12467f3e47d0ec618 and fixed in 7.1.6 with commit c41a54619e95f860bf2950dd679ab353380ecd2b
	Issue introduced in 5.16 with commit e5e32171a2cf1e434d4f88e12467f3e47d0ec618 and fixed in 7.2-rc1 with commit 914a76a9f08366434bf595700f62026b7a19a9cc

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-68269
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/gpu/drm/i915/gem/i915_gem_context.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/4a27275d275971c9ea29d3d240ea4a224ad368a2
	https://git.kernel.org/stable/c/be393175306694de5da1d1a23a8ea4149baa09f1
	https://git.kernel.org/stable/c/45db277b2e1e34bcc99a0852026791108339ec3e
	https://git.kernel.org/stable/c/c41a54619e95f860bf2950dd679ab353380ecd2b
	https://git.kernel.org/stable/c/914a76a9f08366434bf595700f62026b7a19a9cc