Answer in brief
CVE-2026-72019 records a Unknown severity vulnerability in macsec: don't read an unset MAC header in macsec_encrypt(). 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 | >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <dc9ffa1905e72f026d080880a2e4cfc42aa91000 || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <f21fa533a3ed15ada74106aac4b9ddd078fc6b7a || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <e17a42199824973cd8212e95b21ffadf4114a21b || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <2cf10d042562283ff4ae97c02d0993d4f1b5ea29 || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <c39087ad0b97fc11a3b058dfc8db9fd370762cb9 || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <f5089008f90c0a7c5520dff3934e0af00adf322d | dc9ffa1905e72f026d080880a2e4cfc42aa91000, f21fa533a3ed15ada74106aac4b9ddd078fc6b7a, e17a42199824973cd8212e95b21ffadf4114a21b, 2cf10d042562283ff4ae97c02d0993d4f1b5ea29, c39087ad0b97fc11a3b058dfc8db9fd370762cb9, f5089008f90c0a7c5520dff3934e0af00adf322d |
| Linux/Linuxgeneric | 4.6 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: macsec: don't read an unset MAC header in macsec_encrypt() macsec_encrypt() reads the Ethernet header via eth_hdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the SecTAG. On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb reaches the macsec ndo_start_xmit() with the MAC header unset, so eth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of bounds: a 12-byte heap over-read that is also emitted on the wire as the frame's outer source/destination MAC. KASAN reports a slab-out-of-bounds read in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET build flags it as an unset mac header in skb_mac_header(). On the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added by commit 96cc4b69581d ("macvlan: do not assume mac_header is set in macvlan_broadcast()") for exactly this purpose.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-72019 records a Unknown severity vulnerability in macsec: don't read an unset MAC header in macsec_encrypt(). 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 | >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <dc9ffa1905e72f026d080880a2e4cfc42aa91000 || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <f21fa533a3ed15ada74106aac4b9ddd078fc6b7a || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <e17a42199824973cd8212e95b21ffadf4114a21b || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <2cf10d042562283ff4ae97c02d0993d4f1b5ea29 || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <c39087ad0b97fc11a3b058dfc8db9fd370762cb9 || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <f5089008f90c0a7c5520dff3934e0af00adf322d | dc9ffa1905e72f026d080880a2e4cfc42aa91000, f21fa533a3ed15ada74106aac4b9ddd078fc6b7a, e17a42199824973cd8212e95b21ffadf4114a21b, 2cf10d042562283ff4ae97c02d0993d4f1b5ea29, c39087ad0b97fc11a3b058dfc8db9fd370762cb9, f5089008f90c0a7c5520dff3934e0af00adf322d |
| Linux/Linuxgeneric | 4.6 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: macsec: don't read an unset MAC header in macsec_encrypt() macsec_encrypt() reads the Ethernet header via eth_hdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the SecTAG. On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb reaches the macsec ndo_start_xmit() with the MAC header unset, so eth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of bounds: a 12-byte heap over-read that is also emitted on the wire as the frame's outer source/destination MAC. KASAN reports a slab-out-of-bounds read in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET build flags it as an unset mac header in skb_mac_header(). On the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added by commit 96cc4b69581d ("macvlan: do not assume mac_header is set in macvlan_broadcast()") for exactly this purpose.
Quoted source text, attributed separately from HOL analysis.