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CVE-2026-53002— netfilter: conntrack: remove sprintf usage

Quick assessment

Affected
Linux Linux
Exploitation
Public or AI PoC available; prioritize validation
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 2.6.20版本存在安全漏洞，该漏洞源于使用sprintf函数替换为scnprintf时，在mangle_content_len函数中存在栈缓冲区溢出。

CVSS 9.8 · Critical EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9fafcd7b203229c3f3893a475741afc27e276306< 2f793ba78470a99f40389b7dc60a81d9f5ad3956 affected
9fafcd7b203229c3f3893a475741afc27e276306< 6bbf829b4c1b44c941c47dd0d710f1393258f3d5 affected
9fafcd7b203229c3f3893a475741afc27e276306< ab64e61c9323fa6de21bd20da1ddb29a0fb65d34 affected
9fafcd7b203229c3f3893a475741afc27e276306< 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e affected
9fafcd7b203229c3f3893a475741afc27e276306< a8e0a32a23d3f34862af3b4da792ecb3a891a9a3 affected
9fafcd7b203229c3f3893a475741afc27e276306< 8e3be0d12615a173fe260cd42753ca7a001acbf2 affected
9fafcd7b203229c3f3893a475741afc27e276306< c08ff52e44945e6ef4ce0790f49ea761b060c45b affected
9fafcd7b203229c3f3893a475741afc27e276306< 6e7066bdb481a87fe88c4fa563e348c03b2d373d affected
… +10 more rows
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I. Basic Information for CVE-2026-53002

Vulnerability Information
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Vulnerability Title
netfilter: conntrack: remove sprintf usage
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: remove sprintf usage Replace it with scnprintf, the buffer sizes are expected to be large enough to hold the result, no need for snprintf+overflow check. Increase buffer size in mangle_content_len() while at it. BUG: KASAN: stack-out-of-bounds in vsnprintf+0xea5/0x1270 Write of size 1 at addr [..] vsnprintf+0xea5/0x1270 sprintf+0xb1/0xe0 mangle_content_len+0x1ac/0x280 nf_nat_sdp_session+0x1cc/0x240 process_sdp+0x8f8/0xb80 process_invite_request+0x108/0x2b0 process_sip_msg+0x5da/0xf50 sip_help_tcp+0x45e/0x780 nf_confirm+0x34d/0x990 [..]
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.20版本存在安全漏洞，该漏洞源于使用sprintf函数替换为scnprintf时，在mangle_content_len函数中存在栈缓冲区溢出。
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 9fafcd7b203229c3f3893a475741afc27e276306 ~ 2f793ba78470a99f40389b7dc60a81d9f5ad3956 -
Linux Linux 2.6.20 -

II. Public POCs for CVE-2026-53002

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 6926 chars
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III. Intelligence Information for CVE-2026-53002

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Patches & Fixes for CVE-2026-53002 (8)

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

CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
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-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
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-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
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()
CVE-2026-53057 8.8 HIGH iommu/riscv: Add IOTINVAL after updating DDT/PDT entries

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-2026-53002

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