Description
In the Linux kernel, the following vulnerability has been resolved: net: guard timestamp cmsgs to real error queue skbs skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb from sk_error_queue. That assumption is not true for AF_PACKET sockets: outgoing packet taps are also delivered to packet sockets with skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET instead of struct sock_exterr_skb. If such an skb is received with timestamping enabled, the generic timestamp cmsg path can read AF_PACKET control-buffer state as sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop counter overlaps opt_stats. An odd drop count makes the path emit SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear skbs this copies past the linear head and can trigger hardened usercopy or disclose adjacent heap contents. Keep skb_is_err_queue() local to net/socket.c, but make it verify that the PACKET_OUTGOING marker is paired with the sock_rmem_free destructor installed by sock_queue_err_skb(). AF_PACKET receive skbs use normal receive ownership and no longer pass as error-queue skbs, while legitimate sk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free ownership.
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
8605330aac5a5785630aec8f64378a54891937cc to < 24a0d548d3a765cd4558224e4f8e06e14cba26e3affected8605330aac5a5785630aec8f64378a54891937cc to < 71ff5cdd5da61d0438e902aa0fd68c28bc901abeaffected8605330aac5a5785630aec8f64378a54891937cc to < ad9a0374ee6d11048e1f74cd5180bad58b9848b4affected8605330aac5a5785630aec8f64378a54891937cc to < b903e9b5629ec8dd6db92174070045bf81ad7060affected8605330aac5a5785630aec8f64378a54891937cc to < e0665b2a8e90bb08bd205062c75662b502d31797affected8605330aac5a5785630aec8f64378a54891937cc to < 3dde4fb941fa5649ab809f6cd3e20e0c424a4e31affected8605330aac5a5785630aec8f64378a54891937cc to < eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24aaffected8605330aac5a5785630aec8f64378a54891937cc to < 1ee90b77b727df903033db873c75caac5c27ec98affectedcdaf15b43bd31003220cb080bcbbd57787a2fca9affected4.10.14 to < 4.11affected
Linux Linux
Default version status: affected
4.11affected0 to < 4.11unaffected5.10.259 to ≤ 5.10.*unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.143 to ≤ 6.6.*unaffected6.12.94 to ≤ 6.12.*unaffected6.18.36 to ≤ 6.18.*unaffected7.0.13 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3 ↗
- https://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe ↗
- https://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4 ↗
- https://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060 ↗
- https://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797 ↗
- https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31 ↗
- https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a ↗
- https://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗