CVE-2026-89477— sctp: fix NULL deref on untransmitted RECONF completion
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Linux 内核中，已修复以下漏洞： SCTP：修复未发送的 RECONF 完成处理中的空指针解引用 、 和 通过停止其所在传输层上的重配置定时器来完成待处理的流重配置请求： 是在 将块附加到出站数据包时分配的，并且 也在同一位置启动 reconf 定时器。如果一个请求已经发布到 但尚未传输，则其 字段为空（NULL），因此在完成该请求时会对 NULL 进行解引用。 有两种方式可以触发此问题： 1. 通过本地地址移除触发 在被移除的地址是关联中最后一个地址时，会设置 标志位，但不发送任何 ASCONF 消息。随
Affected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 81054476453640159149cb6704e834893e16736b< 77ea60f2d24002c308f224db44a4542c466489af |
affected |
81054476453640159149cb6704e834893e16736b< 25419f516ea84b1e7d3d55aae5215ac86ece0c66 |
affected | ||
81054476453640159149cb6704e834893e16736b< 0ee697defc0594f1da810ed75d9d643fb46f5318 |
affected | ||
81054476453640159149cb6704e834893e16736b< 2db9bfa3e27bdea15e05ea70b56bad3d21e570ec |
affected | ||
4.11 |
affected | ||
< 4.11 |
unaffected | ||
6.12.109≤ 6.12.* |
unaffected | ||
6.18.50≤ 6.18.* |
unaffected | ||
| … +2 more rows | |||
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I. Basic Information for CVE-2026-89477
Vulnerability Information
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Vulnerability Title
sctp: fix NULL deref on untransmitted RECONF completion
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
sctp: fix NULL deref on untransmitted RECONF completion
sctp_process_strreset_outreq(), sctp_process_strreset_addstrm_out() and
sctp_process_strreset_resp() complete a pending stream reconfiguration
request by stopping the reconf timer on the transport it was sent on:
t = asoc->strreset_chunk->transport;
if (timer_delete(&t->reconf_timer))
sctp_transport_put(t);
chunk->transport is assigned by __sctp_packet_append_chunk() when the
chunk is appended to an outbound packet, and sctp_outq_flush_ctrl() arms
the reconf timer at that same point. A request already published in
asoc->strreset_chunk but not yet transmitted has neither, so completing
it dereferences NULL.
Two ways to get there. sctp_send_asconf_del_ip() sets
asoc->src_out_of_asoc_ok without sending anything when the address being
removed is the association's last one, and sctp_outq_flush_ctrl() then
leaves every non-ASCONF control chunk queued; as only
sctp_process_asconf_ack() clears that flag, it persists. An unprivileged
process that removes such an address and then asks for a stream reset
panics the kernel from softirq. A peer needs neither ASCONF nor local
help: sctp_cmd_interpreter() uncorks the outqueue only once the whole
packet has been processed, so a reply built while walking a RECONF chunk
stays untransmitted for the rest of that walk, and one RECONF chunk
carrying [Incoming SSN Reset Request, Outgoing SSN Reset Request,
Response] -- or two RECONF chunks in one packet -- reaches the same
dereference.
KASAN: null-ptr-deref in range [0x00000000000001e8-0x00000000000001ef]
RIP: 0010:timer_delete+0x67/0x110
Call Trace:
<IRQ>
sctp_process_strreset_addstrm_out (net/sctp/stream.c:832)
sctp_sf_do_reconf (net/sctp/sm_statefuns.c:4212)
sctp_do_sm (net/sctp/sm_sideeffect.c:1172)
sctp_assoc_bh_rcv (net/sctp/associola.c:1044)
sctp_rcv (net/sctp/input.c:243)
ip_local_deliver (net/ipv4/ip_input.c:262)
process_backlog (net/core/dev.c:6680)
</IRQ>
A response can only acknowledge a request that was actually sent, so do
not match asoc->strreset_chunk while chunk->transport is NULL. Guarding
the lookup covers all three completion sites.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-89477
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-89477 (4)
Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total
| CVE-2026-89490 | ocfs2: fix readdir position truncation on 32-bit kernels | |
| CVE-2026-89478 | sctp: drop a chunk if its transport was removed | |
| CVE-2026-89479 | sctp: stop processing a packet once its association is deleted | |
| CVE-2026-89480 | nvme-tcp: reject a read that transferred too few bytes | |
| CVE-2026-89482 | nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone | |
| CVE-2026-89481 | nvme-tcp: fix host memory disclosure on R2T for a read command | |
| CVE-2026-89483 | nvme: zero the discard fallback page | |
| CVE-2026-89484 | lockd: fix NULL dereference on lockowner allocation failure | |
| CVE-2026-89485 | lockd: pin next file across nlm_inspect_file lock-drop | |
| CVE-2026-89486 | ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user() | |
| CVE-2026-89487 | openvswitch: only skb_tx_error() a packet we are about to drop | |
| CVE-2026-89488 | openvswitch: Fix CT limit teardown use-after-free | |
| CVE-2026-89489 | openrisc: fix arbitrary kernel memory access via or1k_atomic syscall | |
| CVE-2026-89491 | ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin() | |
| CVE-2026-89501 | ring-buffer: Hold cpu_buffer::lock when resizing a subbuf | |
| CVE-2026-89498 | orangefs: fix double-free of trailer_buf on readdir copy failure | |
| CVE-2026-89499 | ring-buffer: Stop remote reader update when page swap fails | |
| CVE-2026-89500 | ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page | |
| CVE-2026-89497 | orangefs: skip leading spaces before parsing client debug masks | |
| CVE-2026-89502 | ring-buffer: Free cpu_buffer::free_page with subbuf_order |
Showing top 20 of 431 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-89773
drm/amd/display: Skip Update HDCP Config In Transition State -
CVE-2026-89772
btrfs: write-protect folios during data writeback -
CVE-2026-89771
ring-buffer: Fix subbuf resize race with ring buffer readers -
CVE-2026-89770
iomap: don't free integrity payload that doesn't exist -
CVE-2026-89769
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_sta
Same vendor: Linux
-
CVE-2026-89773
drm/amd/display: Skip Update HDCP Config In Transition State -
CVE-2026-89772
btrfs: write-protect folios during data writeback -
CVE-2026-89771
ring-buffer: Fix subbuf resize race with ring buffer readers -
CVE-2026-89770
iomap: don't free integrity payload that doesn't exist -
CVE-2026-89769
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_sta
V. Comments for CVE-2026-89477
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