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CVE-2026-52998— netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check

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存在安全漏洞，该漏洞源于nf_osf_ttl函数在未验证设备指针有效性的情况下访问skb->dev进行本地接口地址查找，可能导致空指针取消引用。

CVSS 7.5 · High EPSS 0.58% · P47

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< f4de0777e4554a7de19c920accde6319dd530782 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< c996a90f3071cf43683e5423da31aadbe002b8b4 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< edc806f9122961f0d3819f7c69c14cccde31f277 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 5d05de2f0928d81309a815ecc76d1a3ad72cbc16 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 95be653a76793856ff8b2d8bd82c2943c23f5ca8 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 79b90a96688e521771fa6ed3dc7864b76b8df293 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 83fc5dd63455a779ea2dd0f7ffee3c920919d80b affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 711987ba281fd806322a7cd244e98e2a81903114 affected
… +10 more rows
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I. Basic Information for CVE-2026-52998

Vulnerability Information
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Vulnerability Title
netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check The nf_osf_ttl() function accessed skb->dev to perform a local interface address lookup without verifying that the device pointer was valid. Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn't especially in modern environments with containers and virtual switching. Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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存在安全漏洞，该漏洞源于nf_osf_ttl函数在未验证设备指针有效性的情况下访问skb->dev进行本地接口地址查找，可能导致空指针取消引用。
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 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 ~ f4de0777e4554a7de19c920accde6319dd530782 -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2026-52998

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III. Intelligence Information for CVE-2026-52998

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Patches & Fixes for CVE-2026-52998 (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-2026-52998

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