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CVE-2026-74490— tipc: avoid use-after-free in poll trace queue dumps

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.0版本存在安全漏洞，该漏洞源于tipc_poll在未持有套接字锁的情况下访问队列转储，可能导致释放后重用。

CVSS 8.8 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b4b9771bcbbd5839b0f77aba55e2f85989ed6779< 3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8 affected
b4b9771bcbbd5839b0f77aba55e2f85989ed6779< ae7fc824970888b4fdaa076819c9a6f2fcede275 affected
b4b9771bcbbd5839b0f77aba55e2f85989ed6779< 78706367fe1b98aee0a6de27c62b7f1e3035f38d affected
b4b9771bcbbd5839b0f77aba55e2f85989ed6779< d7940bb6a8e7ab28f972c2875cb05783216312dc affected
b4b9771bcbbd5839b0f77aba55e2f85989ed6779< 5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d affected
b4b9771bcbbd5839b0f77aba55e2f85989ed6779< bed792737b5f1ba773054dbe984502958bdfe6ce affected
b4b9771bcbbd5839b0f77aba55e2f85989ed6779< ac2f787980fdf4364cd5651a4c8128e59b8de3aa affected
b4b9771bcbbd5839b0f77aba55e2f85989ed6779< b4f1719dfea023220e0e6bd892b087d76b2a6a49 affected
… +10 more rows
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I. Basic Information for CVE-2026-74490

Vulnerability Information
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Vulnerability Title
tipc: avoid use-after-free in poll trace queue dumps
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. Other queue dump trace callsites keep their existing output under the locking they already provide, while poll still emits the event itself without walking live queue members from an unlocked context.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.0版本存在安全漏洞，该漏洞源于tipc_poll在未持有套接字锁的情况下访问队列转储，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b4b9771bcbbd5839b0f77aba55e2f85989ed6779 ~ 3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-74490

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III. Intelligence Information for CVE-2026-74490

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Patches & Fixes for CVE-2026-74490 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72208 9.8 CRITICAL ntfs: add bounds check before accessing EA entries
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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