CVE-2026-98172— smb: client: fix smbd_connection leak on cifs_get_tcp_session() error
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： smb：客户端：修复在 cifs_get_tcp_session() 出错时发生的 smbd_connection 泄漏问题 当通过 smbd_get_connection() 成功建立 RDMA 连接后，若后续 cifs_get_tcp_session() 调用失败（例如 kthread_create() 返回错误），错误处理路径会在未先销毁 smbd_connection 的情况下释放 tcp_ses。 通过在 kfree(tcp_ses) 之前的 out_err
Affected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 2f8946464b11822169b9f10c7cf58a2440b51d54< 3164402c58940ff58a3cecdb026405f07b0253af |
affected |
2f8946464b11822169b9f10c7cf58a2440b51d54< e3344bb0ff5ec8a276f42239e140f5442841ef23 |
affected | ||
2f8946464b11822169b9f10c7cf58a2440b51d54< 5c908e49d349266dff0c86dda6a05df0ff19b824 |
affected | ||
2f8946464b11822169b9f10c7cf58a2440b51d54< 928edc4bd6a617caabeb575fc13c254d9df623c4 |
affected | ||
2f8946464b11822169b9f10c7cf58a2440b51d54< b26a3fcf2f1c2cadba400290b639f01395db8fc8 |
affected | ||
2f8946464b11822169b9f10c7cf58a2440b51d54< e75c96157d45e498970158c8f7373d90102e33b9 |
affected | ||
4.16 |
affected | ||
< 4.16 |
unaffected | ||
| … +6 more rows | |||
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I. Basic Information for CVE-2026-98172
Vulnerability Information
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Vulnerability Title
smb: client: fix smbd_connection leak on cifs_get_tcp_session() error
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix smbd_connection leak on cifs_get_tcp_session() error
When an RDMA connection is successfully established via
smbd_get_connection() but cifs_get_tcp_session() later fails (e.g.
kthread_create() returns an error), the error path frees tcp_ses
without first destroying the smbd_connection.
Fix this by calling smbd_destroy() in the out_err cleanup path before
kfree(tcp_ses). smbd_destroy() safely handles the case where
smbd_conn is NULL, so it can be called unconditionally.
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-2026-98172
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-98172 (5)
Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total
| CVE-2026-98323 | 9.8 CRITICAL | RDMA/siw: Bound fragmented header copies by the remaining length |
| CVE-2026-98365 | 9.8 CRITICAL | RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access |
| CVE-2026-98282 | 8.8 HIGH | powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba |
| CVE-2026-98283 | 8.8 HIGH | KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid() |
| CVE-2026-98339 | 8.8 HIGH | wifi: cfg80211: don't filter by BSS type when removing stale entries |
| CVE-2026-98171 | 8.8 HIGH | smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs |
| CVE-2026-98261 | 8.1 HIGH | cifs: Fix server use-after-free in cifs_chan_skip_or_disable() |
| CVE-2026-98357 | 8.1 HIGH | IB/isert: wait for deferred control PDU completions before releasing the connection |
| CVE-2026-98239 | 8.1 HIGH | net: lan743x: fix RX checksum use-after-free |
| CVE-2026-98341 | 7.8 HIGH | wifi: cfg80211: don't free driver-owned scan requests |
| CVE-2026-98324 | 7.8 HIGH | dmaengine: pxa: fix double counting of the hw descriptors |
| CVE-2026-98228 | 7.8 HIGH | mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ |
| CVE-2026-98229 | 7.8 HIGH | xfrm: save input state data before secpath resets |
| CVE-2026-98320 | 7.8 HIGH | netfilter: flowtable: hold reference on ct until flow is released |
| CVE-2026-98318 | 7.8 HIGH | smb: client: validate absolute native symlink targets before NT fixups |
| CVE-2026-98315 | 7.8 HIGH | ntfs: protect runlist updates with the runlist lock |
| CVE-2026-98260 | 7.8 HIGH | exec: Cleanup POSIX timers right after de_thread() |
| CVE-2026-98256 | 7.8 HIGH | signal: Prevent exec() race |
| CVE-2026-98258 | 7.8 HIGH | posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list |
| CVE-2026-98254 | 7.8 HIGH | swiotlb: use the adjusted address for the highmem page lookup |
Showing top 20 of 208 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98374
tcp: fix use-after-free of retransmit_skb_hint in tcp_send_s -
CVE-2026-98373
mm/hugetlb: preserve mremap address delta when skipping page -
CVE-2026-98372
xfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk -
CVE-2026-98371
xfrm: iptfs: fix runt reassembly panic from short inner tot_ -
CVE-2026-98370
xfrm: fix compat ALLOCSPI request use-after-free
Same vendor: Linux
-
CVE-2026-98374
tcp: fix use-after-free of retransmit_skb_hint in tcp_send_s -
CVE-2026-98373
mm/hugetlb: preserve mremap address delta when skipping page -
CVE-2026-98372
xfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk -
CVE-2026-98371
xfrm: iptfs: fix runt reassembly panic from short inner tot_ -
CVE-2026-98370
xfrm: fix compat ALLOCSPI request use-after-free
V. Comments for CVE-2026-98172
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