[OE-core][PATCH v3 5/9] cve-exclusions: set status for CVE-2022-1247

[Junjie Cao <junjie.cao@linux.dev>]

The CVE describes a race between rose_connect() and the code that frees
a rose_neigh once its count and use fields reach zero.

net/rose, and rose_connect() with it, was removed entirely in v7.1:

  https://git.kernel.org/linus/dd8d4bc28ad7252610d8e79c1313a2d1e3499a51
  ("net: remove ax25 and amateur radio (hamradio) subsystem", v7.1)

The linux-yocto kernel on master is 6.18, which still carries net/rose.
There the race is closed by Takamitsu Iwai's August 2025 refcount
conversion, which converts the 'use' field to refcount_t and removes the
unlocked rose->neighbour->use++ in rose_connect() that the CVE describes:

  https://git.kernel.org/linus/d860d1faa6b2ce3becfdb8b0c2b048ad31800061
  ("net: rose: convert 'use' field to refcount_t", v6.17)
  https://git.kernel.org/linus/da9c9c877597170b929a6121a68dcd3dd9a80f45
  ("net: rose: include node references in rose_neigh refcount", v6.17)

Both are in v6.17 and were backported to 6.1.y, 6.6.y, 6.12.y and 6.16.y
in the 2025-09-02 stable round. Upstream assigned these two commits their
own identifiers, CVE-2025-39826 and CVE-2025-39827 (both fixed in
v6.17-rc4), so the identification does not rest on this reading of the
diff alone. The Red Hat record for CVE-2022-1247 still shows it open and
lists no fix.

CC: Paul Barker <paul@pbarker.dev>
AI-Generated: Uses Claude (claude-opus-5)
Signed-off-by: Junjie Cao <junjie.cao@linux.dev>
---
v3:
- lead with the v7.1 removal of net/rose per review; keep the v6.17
  commits, which are what covers the 6.18 kernel on master
- cite the upstream CVE-2025-39826 / CVE-2025-39827 assignments for
  the two fixing commits instead of relying on the diff match alone

v2: https://lore.kernel.org/openembedded-core/20260803084827.1348810-1-junjie.cao@linux.dev/

 meta/recipes-kernel/linux/cve-exclusion.inc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/meta/recipes-kernel/linux/cve-exclusion.inc b/meta/recipes-kernel/linux/cve-exclusion.inc
index be74672..b08eaa1 100644
--- a/meta/recipes-kernel/linux/cve-exclusion.inc
+++ b/meta/recipes-kernel/linux/cve-exclusion.inc
@@ -221,3 +221,11 @@ exploitation requires a relative kernel.core_pattern"
 # https://bugzilla.redhat.com/show_bug.cgi?id=2044575
 CVE_STATUS[CVE-2022-0400] = "disputed: the reported net/smc out-of-bounds read \
 was never substantiated and was closed as not-a-bug by Red Hat, SUSE and Debian"
+
+# net/rose and rose_connect() were removed entirely in v7.1 (dd8d4bc28ad7).
+# The 6.18 kernel on master still carries net/rose; there the race is
+# closed by the v6.17 refcount conversion, which upstream tracks as
+# CVE-2025-39826 / CVE-2025-39827.
+# Fix https://git.kernel.org/linus/d860d1faa6b2ce3becfdb8b0c2b048ad31800061
+# Fix https://git.kernel.org/linus/da9c9c877597170b929a6121a68dcd3dd9a80f45
+CVE_STATUS[CVE-2022-1247] = "fixed-version: Fixed from version 6.17"
-- 
2.43.0