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CVE-2026-52970— netfilter: nft_ct: fix missing expect put in obj eval

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于netfilter: nft_ct组件在对象评估时未释放预期引用，可能导致资源泄漏。

AI Predicted 4.4 Difficulty: Easy EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 857b46027d6f91150797295752581b7155b9d0e1< cdb9a25dd3416d427e8b2753210f8baf44207577 affected
857b46027d6f91150797295752581b7155b9d0e1< 26ab32ec73941871c97562ee1f39587950dc3b68 affected
857b46027d6f91150797295752581b7155b9d0e1< 7b96242ceedfe249f158419f3254bcee04173ffe affected
857b46027d6f91150797295752581b7155b9d0e1< ecca618e1e339494911090474ed87742c0f73976 affected
857b46027d6f91150797295752581b7155b9d0e1< 2aef1b13d5c0285f340512c6c07eb858fd018fd8 affected
857b46027d6f91150797295752581b7155b9d0e1< 1dced0725e2fae3ac3416274db20a7ff5a46931d affected
857b46027d6f91150797295752581b7155b9d0e1< 84c422cea5a45fe56be839f25880f21fd33940cd affected
857b46027d6f91150797295752581b7155b9d0e1< 19f94b6fee75b3ef7fbc06f3745b9a771a8a19a4 affected
… +10 more rows
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I. Basic Information for CVE-2026-52970

Vulnerability Information
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Vulnerability Title
netfilter: nft_ct: fix missing expect put in obj eval
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: fix missing expect put in obj eval nft_ct_expect_obj_eval() allocates an expectation and may call nf_ct_expect_related(), but never drops its local reference. Add nf_ct_expect_put(exp) before return to balance allocation.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于netfilter: nft_ct组件在对象评估时未释放预期引用，可能导致资源泄漏。
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 857b46027d6f91150797295752581b7155b9d0e1 ~ cdb9a25dd3416d427e8b2753210f8baf44207577 -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-52970

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III. Intelligence Information for CVE-2026-52970

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Patches & Fixes for CVE-2026-52970 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52970

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