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CVE-2026-53012— nexthop: fix IPv6 route referencing IPv4 nexthop

EPSS 0.18% · P8
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I. Basic Information for CVE-2026-53012

Vulnerability Information
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Vulnerability Title
nexthop: fix IPv6 route referencing IPv4 nexthop
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nexthop: fix IPv6 route referencing IPv4 nexthop syzbot reported a panic [1] [2]. When an IPv6 nexthop is replaced with an IPv4 nexthop, the has_v4 flag of all groups containing this nexthop is not updated. This is because nh_group_v4_update is only called when replacing AF_INET to AF_INET6, but the reverse direction (AF_INET6 to AF_INET) is missed. This allows a stale has_v4=false to bypass fib6_check_nexthop, causing IPv6 routes to be attached to groups that effectively contain only AF_INET members. Subsequent route lookups then call nexthop_fib6_nh() which returns NULL for the AF_INET member, leading to a NULL pointer dereference. Fix by calling nh_group_v4_update whenever the family changes, not just AF_INET to AF_INET6. Reproducer: # AF_INET6 blackhole ip -6 nexthop add id 1 blackhole # group with has_v4=false ip nexthop add id 100 group 1 # replace with AF_INET (no -6), has_v4 stays false ip nexthop replace id 1 blackhole # pass stale has_v4 check ip -6 route add 2001:db8::/64 nhid 100 # panic ping -6 2001:db8::1 [1] https://syzkaller.appspot.com/bug?id=e17283eb2f8dcf3dd9b47fe6f67a95f71faadad0 [2] https://syzkaller.appspot.com/bug?id=8699b6ae54c9f35837d925686208402949e12ef3
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 7bf4796dd09984ad1612877a82d0d139c70ae27f ~ ceffe81a0be92afc0cd1340bc8ca46559cce9bb4 -
LinuxLinux 5.3 -

II. Public POCs for CVE-2026-53012

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III. Intelligence Information for CVE-2026-53012

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Patches & Fixes for CVE-2026-53012 (8)

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

CVE-2026-530469.8 CRITICALksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-530889.8 CRITICALnet: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-530109.8 CRITICALksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-530069.8 CRITICALipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-530869.8 CRITICALnet: bcmgenet: fix racing timeout handler
CVE-2026-530029.8 CRITICALnetfilter: conntrack: remove sprintf usage
CVE-2026-529939.8 CRITICALtipc: fix double-free in tipc_buf_append()
CVE-2026-529899.8 CRITICALnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-529869.8 CRITICALnetfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-529829.8 CRITICALnet: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-530459.8 CRITICALmemory: tegra124-emc: Fix dll_change check
CVE-2026-529559.8 CRITICALlibceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-530499.8 CRITICALgfs2: add some missing log locking
CVE-2026-529149.8 CRITICALbatman-adv: fix fragment reassembly length accounting
CVE-2026-529319.8 CRITICALbatman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-529249.8 CRITICALsctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-530559.8 CRITICALcrypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-530439.1 CRITICALocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-529999.1 CRITICALnetfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-529589.1 CRITICALlibceph: Fix potential out-of-bounds access in osdmap_decode()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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