CVE-2026-97958— net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().
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，以下漏洞已得到修复： net/sched: cls_api: 不要在 tc_ctl_chain() 中重放 RTM_GETCHAIN。 如果 netlink 套接字反复发送 RTM_GETCHAIN 请求，而未通过 recv() 接收响应，则 tc_ctl_chain() 会大量占用 CPU 并触发“Hung Task”（任务挂起）警告。[0] 根据栈跟踪信息，当用户空间 netlink 套接字的接收缓冲区已满时，netlink_attachskb() 可能返回 -EAGAIN，从而干扰 t
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 2ed9db3074fcd8d12709fe40ff0e691d74229818< 240251a4ca7cda213103694b6e21c4a5745e5d8b |
affected |
2ed9db3074fcd8d12709fe40ff0e691d74229818< 9a0f07f7dbd1bfe8c2fd03ad055e9e60a703d5df |
affected | ||
2ed9db3074fcd8d12709fe40ff0e691d74229818< 6558b0d46c5941ed1aa67da8878e224c54239cc5 |
affected | ||
2ed9db3074fcd8d12709fe40ff0e691d74229818< 96c2fc5daf983af2e0c1256c31e89c1f3f855279 |
affected | ||
2ed9db3074fcd8d12709fe40ff0e691d74229818< a1c2840d95af1fa3d83ba71e23fa0c674a4c6796 |
affected | ||
2ed9db3074fcd8d12709fe40ff0e691d74229818< 503ba58481e3ba69d28127d35a39cec529f9670c |
affected | ||
2ed9db3074fcd8d12709fe40ff0e691d74229818< e9ac395bb56122a057d0aa91a6b55d9e3fa37c26 |
affected | ||
2ed9db3074fcd8d12709fe40ff0e691d74229818< dff39930ad5e53d202bfdfb14687d1d2fd753b4d |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-97958
Vulnerability Information
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Vulnerability Title
net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().
If a netlink socket sends RTM_GETCHAIN requests repeatedly
without recv()ing the responses, tc_ctl_chain() hogs CPU and
triggers Hung Task splat. [0]
As caught in the stack trace, netlink_attachskb() could confuse
tc_ctl_chain() by returning -EAGAIN when the userspace netlink
socket's receive buffer is full.
The replay: label exists since commit 32a4f5ecd738 ("net: sched:
introduce chain object to uapi") but was not used initially.
Since commit 9f407f1768d3 ("net: sched: introduce chain templates"),
the label is needed for RTM_NEWCHAIN because tcf_proto_lookup_ops()
may release RTNL to call request_module().
However, the replay logic is unnecessary for RTM_GETCHAIN.
Let's apply the replay logic only for RTM_NEWCHAIN.
[0]:
INFO: task repro:1018 is blocked on a mutex likely owned by task repro:1022.
task:repro state:R running task stack:14096 pid:1022 tgid:1014 ppid:961 task_flags:0x400040 flags:0x00080000
Call Trace:
<TASK>
? clockevents_program_event (kernel/time/clockevents.c:372)
? pskb_expand_head (net/core/skbuff.c:615)
? skb_release_data (net/core/skbuff.c:1122)
? netlink_attachskb (./include/linux/skbuff.h:1323 ./include/linux/skbuff.h:1332 net/netlink/af_netlink.c:1232)
? __netlink_lookup (./include/linux/rcupdate.h:882 ./include/linux/rhashtable.h:711 net/netlink/af_netlink.c:499)
? tc_chain_notify (net/sched/cls_api.c:3045)
? tc_chain_notify (./include/linux/skbuff.h:1384 net/sched/cls_api.c:3041)
? netlink_unicast (net/netlink/af_netlink.c:1335)
? rtnl_unicast (./include/net/netlink.h:1198 net/core/rtnetlink.c:985)
? tc_ctl_chain (net/sched/cls_api.c:3242)
? rtnetlink_rcv_msg (net/core/rtnetlink.c:7146)
? netlink_unicast (net/netlink/af_netlink.c:1354)
? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:7177)
? netlink_rcv_skb (net/netlink/af_netlink.c:2556)
? netlink_unicast (net/netlink/af_netlink.c:1319)
? netlink_sendmsg (net/netlink/af_netlink.c:1900)
? __sock_sendmsg (net/socket.c:800)
? __sys_sendto (net/socket.c:2281)
? __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284)
? do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
</TASK>
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-2026-97958
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-97958 (8)
Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total
| CVE-2026-100075 | 9.8 CRITICAL | RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters |
| CVE-2026-97555 | 8.8 HIGH | smb: client: fix heap overflow in DACL owner/group rewrite |
| CVE-2026-97957 | 8.8 HIGH | net: hinic: fix mailbox segment buffer overflow |
| CVE-2026-97527 | 8.8 HIGH | scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock |
| CVE-2026-97528 | 8.8 HIGH | scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error |
| CVE-2026-98115 | 8.8 HIGH | ksmbd: safely drain sessions during logoff |
| CVE-2026-97525 | 8.2 HIGH | x86/mm/pat: Allocate split page tables as kernel page tables |
| CVE-2026-98069 | 8.1 HIGH | net/rds: acquire the fastpath locks in rds_conn_shutdown() |
| CVE-2026-97573 | 8.1 HIGH | bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset() |
| CVE-2026-97570 | 8.1 HIGH | bnxt_en: Bound SW TPA IDs to prevent crashes |
| CVE-2026-98130 | 8.1 HIGH | sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START |
| CVE-2026-98070 | 8.1 HIGH | net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks() |
| CVE-2026-97941 | 7.8 HIGH | mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race |
| CVE-2026-97575 | 7.8 HIGH | media: v4l2-ctrls: validate AV1 tile counts |
| CVE-2026-97576 | 7.8 HIGH | media: v4l2-ctrls: validate HEVC tile counts |
| CVE-2026-98002 | 7.8 HIGH | iommu/amd: Fix ineffective error check in nested domain allocation |
| CVE-2026-98112 | 7.8 HIGH | ksmbd: fix listener task lifetime on netdev events |
| CVE-2026-97937 | 7.8 HIGH | ftrace: fork: Initialize function graph state before copy_exec_state() |
| CVE-2026-97580 | 7.8 HIGH | media: rkvdec: bound HEVC tile loops and PPS id to the array capacity |
| CVE-2026-97940 | 7.8 HIGH | ipv6: fix fib6 walker UAF on seq stop |
Showing top 20 of 372 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
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CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
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