Description
In the Linux kernel, the following vulnerability has been resolved: ppp_synctty: ensure a writeable skb header ppp_sync_txmunge() checks headroom before prepending the address and control bytes, but does not ensure that the skb header is writable. A received skb can reach this function through PPP channel bridging without passing through ppp_start_xmit(), which calls skb_cow_head(). For example, a PPPoE frame may share its buffer with a clone queued to an AF_PACKET socket. If it is bridged to a synchronous tty channel, the address/control bytes can overwrite data still visible to that socket. Use skb_cow_head() to ensure both sufficient headroom and a writable header.
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
4cf476ced45d7f12df30a68e833b263e7a2202d1 to < 25e03eeead2c49748c7582dfb64c205f93a42d00affected4cf476ced45d7f12df30a68e833b263e7a2202d1 to < a256f9925288ef47de8febed5c38d5cc21340211affected4cf476ced45d7f12df30a68e833b263e7a2202d1 to < 7953946f68262a8bb137aa101249adef6e029652affected4cf476ced45d7f12df30a68e833b263e7a2202d1 to < 3af7797fbabc84992e0ca5ad2bc0ca8537d053efaffected4cf476ced45d7f12df30a68e833b263e7a2202d1 to < 0996c3e6bcc6ae08cb371ed43648c9f7f748ae6eaffected4cf476ced45d7f12df30a68e833b263e7a2202d1 to < 15d0a6c9a42df2d745c37510dba828f6dbe60d9faffected4cf476ced45d7f12df30a68e833b263e7a2202d1 to < 8aaeb56aff2a557a88f83ae866da2c91ad247e59affected
Linux Linux
Default version status: affected
5.11affected0 to < 5.11unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2.7 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/25e03eeead2c49748c7582dfb64c205f93a42d00 ↗
- https://git.kernel.org/stable/c/a256f9925288ef47de8febed5c38d5cc21340211 ↗
- https://git.kernel.org/stable/c/7953946f68262a8bb137aa101249adef6e029652 ↗
- https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef ↗
- https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e ↗
- https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f ↗
- https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59 ↗