Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: af_packet: Don't send zero-byte data in tpacket_snd(). syzbot reported a WARNING in __dev_queue_xmit() triggered via tpacket_snd(): skb_assert_len WARNING: at include/linux/skbuff.h:2753 skb_assert_len WARNING: at __dev_queue_xmit+0x21bc/0x4970 net/core/dev.c:4781 Call Trace: <TASK> dev_queue_xmit include/linux/netdevice.h:3448 [inline] packet_xmit+0x243/0x310 net/packet/af_packet.c:276 tpacket_snd net/packet/af_packet.c:2907 [inline] packet_sendmsg+0x28d6/0x4eb0 net/packet/af_packet.c:3134 When sending 0-byte packets via TPACKET ring buffer on devices with no hard header (e.g. dev->hard_header_len == 0), tpacket_fill_skb() populates an skb with skb->len == 0 and returns 0. tpacket_snd() then forwards this empty skb to packet_xmit(), causing __dev_queue_xmit() to hit skb_assert_len(skb). Similar checks exist in packet_snd() via commit dc633700f00f ("net/af_packet: check len when min_header_len equals to 0") and in packet_sendmsg_spkt() via commit 6a341729fb31 ("af_packet: Don't send zero-byte data in packet_sendmsg_spkt()."). Return -EINVAL in tpacket_fill_skb() when skb->len is zero to reject zero-length packets in tpacket_snd().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before dde212f8622f5cb36223fff1ebd6e6f2a3dc61fe; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 80a702964467b998d254f16cc61c2c9a20540c9d; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7521e691c7c4f2231634c95053281ac888d1f452; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 1fc70b3d513bafb16b17540178870ef46e81c0bb; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3fa110f9e2ea96f567f2194c673c4bc327640111; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 98c5914d6b7bd4b4675535908e57dea31f1efd6a; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f09ac5682f1bb67981fcb6ead4d3cfe439225876; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6bcd76c134c55c697148acb5c0194e9666abdf84 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.266 through 5.10.*; unaffected 5.15.217 through 5.15.*; unaffected 6.1.184 through 6.1.*; unaffected 6.6.153 through 6.6.*; unaffected 6.12.105 through 6.12.*; unaffected 6.18.46 through 6.18.*; unaffected 7.1.10 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dde212f8622f5cb36223fff1ebd6e6f2a3dc61fe
- https://git.kernel.org/stable/c/80a702964467b998d254f16cc61c2c9a20540c9d
- https://git.kernel.org/stable/c/7521e691c7c4f2231634c95053281ac888d1f452
- https://git.kernel.org/stable/c/1fc70b3d513bafb16b17540178870ef46e81c0bb
- https://git.kernel.org/stable/c/3fa110f9e2ea96f567f2194c673c4bc327640111
- https://git.kernel.org/stable/c/98c5914d6b7bd4b4675535908e57dea31f1efd6a
- https://git.kernel.org/stable/c/f09ac5682f1bb67981fcb6ead4d3cfe439225876
- https://git.kernel.org/stable/c/6bcd76c134c55c697148acb5c0194e9666abdf84