Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
c09440f7dcb304002dfced8c0fea289eb25f2da0 to < b6cec6187b8632423cd99a94fd5e5ba165fa2a33affectedc09440f7dcb304002dfced8c0fea289eb25f2da0 to < 3adea1b1c04b57e08a5c12a1f42483760581ce61affectedc09440f7dcb304002dfced8c0fea289eb25f2da0 to < dc9ffa1905e72f026d080880a2e4cfc42aa91000affectedc09440f7dcb304002dfced8c0fea289eb25f2da0 to < f21fa533a3ed15ada74106aac4b9ddd078fc6b7aaffectedc09440f7dcb304002dfced8c0fea289eb25f2da0 to < e17a42199824973cd8212e95b21ffadf4114a21baffectedc09440f7dcb304002dfced8c0fea289eb25f2da0 to < 2cf10d042562283ff4ae97c02d0993d4f1b5ea29affectedc09440f7dcb304002dfced8c0fea289eb25f2da0 to < c39087ad0b97fc11a3b058dfc8db9fd370762cb9affectedc09440f7dcb304002dfced8c0fea289eb25f2da0 to < f5089008f90c0a7c5520dff3934e0af00adf322daffected
Linux Linux
Default version status: affected
4.6affected0 to < 4.6unaffected5.10.265 to ≤ 5.10.*unaffected5.15.216 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/b6cec6187b8632423cd99a94fd5e5ba165fa2a33 ↗
- https://git.kernel.org/stable/c/3adea1b1c04b57e08a5c12a1f42483760581ce61 ↗
- https://git.kernel.org/stable/c/dc9ffa1905e72f026d080880a2e4cfc42aa91000 ↗
- https://git.kernel.org/stable/c/f21fa533a3ed15ada74106aac4b9ddd078fc6b7a ↗
- https://git.kernel.org/stable/c/e17a42199824973cd8212e95b21ffadf4114a21b ↗
- https://git.kernel.org/stable/c/2cf10d042562283ff4ae97c02d0993d4f1b5ea29 ↗
- https://git.kernel.org/stable/c/c39087ad0b97fc11a3b058dfc8db9fd370762cb9 ↗
- https://git.kernel.org/stable/c/f5089008f90c0a7c5520dff3934e0af00adf322d ↗