cbcvebase.
CVE-2023-53296
published 2025-09-16

CVE-2023-53296: In the Linux kernel, the following vulnerability has been resolved: sctp: check send stream number after wait_for_sndbuf This patch fixes a corner case where…

PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.14%
3.5th percentile
In the Linux kernel, the following vulnerability has been resolved: sctp: check send stream number after wait_for_sndbuf This patch fixes a corner case where the asoc out stream count may change after wait_for_sndbuf. When the main thread in the client starts a connection, if its out stream count is set to N while the in stream count in the server is set to N - 2, another thread in the client keeps sending the msgs with stream number N - 1, and waits for sndbuf before processing INIT_ACK. However, after processing INIT_ACK, the out stream count in the client is shrunk to N - 2, the same to the in stream count in the server. The crash occurs when the thread waiting for sndbuf is awake and sends the msg in a non-existing stream(N - 1), the call trace is as below: KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] Call Trace: sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x197d/0x5310 net/sctp/sm_sideeffect.c:1170 sctp_primitive_SEND+0x9f/0xc0 net/sctp/primitive.c:163 sctp_sendmsg_to_asoc+0x10eb/0x1a30 net/sctp/socket.c:1868 sctp_sendmsg+0x8d4/0x1d90 net/sctp/socket.c:2026 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825 sock_sendmsg_nosec net/socket.c:722 [inline] sock_sendmsg+0xde/0x190 net/socket.c:745 The fix is to add an unlikely check for the send stream number after the thread wakes up from the wait_for_sndbuf.

Affected

20 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.25-1 (bookworm)linux 6.1.25-1 (bookworm)
linuxlinux——
linuxlinux>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < 9346a1a21142357972a6f466ba6275ddc54b04ac9346a1a21142357972a6f466ba6275ddc54b04ac
linuxlinux>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < 0443fff49d6352160c200064156c25898bd9f58c0443fff49d6352160c200064156c25898bd9f58c
linuxlinux>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < b4b6dfad41aaae9e36e44327b18d5cf4b20dd2ceb4b6dfad41aaae9e36e44327b18d5cf4b20dd2ce
linuxlinux>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < 667eb99cf7c15fe5b0ecefe75cf658e20ef20c9f667eb99cf7c15fe5b0ecefe75cf658e20ef20c9f
linuxlinux>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < d2128636b303aa9cf065055402ee6697409a8837d2128636b303aa9cf065055402ee6697409a8837
linuxlinux>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < a615e7270318fa0b98bf1ff38daf6cf52d840312a615e7270318fa0b98bf1ff38daf6cf52d840312
linuxlinux>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < 2584024b23552c00d95b50255e47bd18d306d31a2584024b23552c00d95b50255e47bd18d306d31a
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 5.10.178-15.10.178-1
linuxlinux_kernel>= 0 < 6.1.25-16.1.25-1
linuxlinux_kernel>= 0 < 6.1.25-16.1.25-1
linuxlinux_kernel>= 0 < 6.1.25-16.1.25-1
linuxlinux_kernel>= 4.15 < 4.19.2814.19.281
linuxlinux_kernel>= 4.20 < 5.4.2415.4.241
linuxlinux_kernel>= 5.11 < 5.15.1075.15.107
linuxlinux_kernel>= 5.16 < 6.1.246.1.24
linuxlinux_kernel>= 5.5 < 5.10.1785.10.178
linuxlinux_kernel>= 6.2 < 6.2.116.2.11

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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