CVE-2026-72019
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
macsec: don't read an unset MAC header in macsec_encrypt()
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | b6cec6187b8632423cd99a94fd5e5ba165fa2a33 | Unavailable | None listed |
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | 3adea1b1c04b57e08a5c12a1f42483760581ce61 | Unavailable | None listed |
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | dc9ffa1905e72f026d080880a2e4cfc42aa91000 | Unavailable | None listed |
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | f21fa533a3ed15ada74106aac4b9ddd078fc6b7a | Unavailable | None listed |
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | e17a42199824973cd8212e95b21ffadf4114a21b | Unavailable | None listed |
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | 2cf10d042562283ff4ae97c02d0993d4f1b5ea29 | Unavailable | None listed |
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | c39087ad0b97fc11a3b058dfc8db9fd370762cb9 | Unavailable | None listed |
| c09440f7dcb304002dfced8c0fea289eb25f2da0 | affected | git | f5089008f90c0a7c5520dff3934e0af00adf322d | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.6 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.6 | Unavailable | None listed |
| 5.10.265 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.216 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.178 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.145 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.97 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.40 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.5 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |