Answer in brief
CVE-2026-80742 records a Unknown severity vulnerability in af_packet: Don't send zero-byte data in tpacket_snd().. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dde212f8622f5cb36223fff1ebd6e6f2a3dc61fe || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80a702964467b998d254f16cc61c2c9a20540c9d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7521e691c7c4f2231634c95053281ac888d1f452 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1fc70b3d513bafb16b17540178870ef46e81c0bb || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3fa110f9e2ea96f567f2194c673c4bc327640111 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98c5914d6b7bd4b4675535908e57dea31f1efd6a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f09ac5682f1bb67981fcb6ead4d3cfe439225876 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6bcd76c134c55c697148acb5c0194e9666abdf84 | dde212f8622f5cb36223fff1ebd6e6f2a3dc61fe, 80a702964467b998d254f16cc61c2c9a20540c9d, 7521e691c7c4f2231634c95053281ac888d1f452, 1fc70b3d513bafb16b17540178870ef46e81c0bb, 3fa110f9e2ea96f567f2194c673c4bc327640111, 98c5914d6b7bd4b4675535908e57dea31f1efd6a, f09ac5682f1bb67981fcb6ead4d3cfe439225876, 6bcd76c134c55c697148acb5c0194e9666abdf84 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 3, 2026
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().
Quoted source text, attributed separately from HOL analysis.