CVE-2023-53296
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-16

Last updated on: 2025-12-02

Assigner: kernel.org

Description
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: <TASK> 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.
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Meta Information
Published
2025-09-16
Last Modified
2025-12-02
Generated
2026-05-27
AI Q&A
2025-09-16
EPSS Evaluated
2026-05-25
NVD
CVE-2023-53296
Affected Vendors & Products
Showing 11 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 4.15 (inc) to 4.19.281 (exc)
linux linux_kernel From 4.20 (inc) to 5.4.241 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.178 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.107 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.24 (exc)
linux linux_kernel From 6.2 (inc) to 6.2.11 (exc)
linux linux_kernel 6.3
linux linux_kernel 6.3
linux linux_kernel 6.3
linux linux_kernel 6.3
linux linux_kernel 6.3
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a race condition in the Linux kernel's SCTP implementation where the send stream number is not properly checked after a thread wakes up from waiting for buffer space (wait_for_sndbuf). Specifically, if the client's outgoing stream count changes after processing an INIT_ACK message, a thread may attempt to send a message on a stream number that no longer exists, leading to a null pointer dereference and kernel crash.


How can this vulnerability impact me? :

This vulnerability can cause a kernel crash (null pointer dereference) in systems using SCTP, potentially leading to denial of service or system instability.


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