[PATCH 5.10/5.15/6.1/6.6] vlan: require the MAC header to be present in __vlan_insert_inner_tag()

[Alexander Martyniuk <alexevgmart@gmail.com>]

From: Xiang Mei <xmei5@asu.edu>

commit ab888242fce4f16f6c4d4c6ec53939ad36aa3b3a upstream.

__vlan_insert_inner_tag() only guarantees head room via skb_cow_head(),
never that mac_len bytes of MAC header are present.  Its ETH_HLEN
wrappers - __vlan_insert_tag() under skb_vlan_push(), and
vlan_insert_tag() under validate_xmit_vlan() on the generic transmit
path - therefore rewrite the first 16 bytes at skb->data: a 12-byte
memmove plus two 2-byte stores at +12 and +14.  No caller supplies the
bound, while the pop helpers use skb_ensure_writable()/pskb_may_pull().

An IFF_TUN device has hard_header_len == 0, so packet_snd() accepts a
one-byte AF_PACKET/SOCK_RAW frame.  The first vlan push only sets a
hwaccel tag; the next - clsact "action vlan push" or
bpf_skb_vlan_push() - enters the helper with skb->len still 1.  The
head comes from skbuff_small_head without __GFP_ZERO, so each push
drags bytes from beyond skb->tail into the frame.  After three the
one-byte send leaves as 13 bytes carrying 11 bytes of uninitialised
slab:

  0000: 5a b3 62 12 80 88 ff ff 00 b3 62 12 81
           `------------------------------'
  only 0x5a was sent; the rest is slab, here the top 56 bits of a
  linear-map address

Require the MAC header the helper rewrites to be present, so such a
frame is dropped rather than transmitted.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Reported-by: co+0ea1ac045375cf05@bugs.sh
Signed-off-by: Xiang Mei <xmei5@asu.edu>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260915083152.705309-1-xmei5@asu.edu
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Alexander Martyniuk <alexevgmart@gmail.com>
---
Backport fix for CVE-2026-98377
 include/linux/if_vlan.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 3728e3978f83..2759d3846666 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -346,6 +346,9 @@ static inline int __vlan_insert_inner_tag(struct sk_buff *skb,
 {
 	struct vlan_ethhdr *veth;
 
+	if (unlikely(!pskb_may_pull(skb, mac_len)))
+		return -EINVAL;
+
 	if (skb_cow_head(skb, VLAN_HLEN) < 0)
 		return -ENOMEM;
 
-- 
2.43.0