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CVE-2026-72423— bpf: Guard conntrack opts error writes

CVSS 8.8 · High EPSS 0.15% · P5

Affected Version Matrix 6

VendorProductVersion RangeStatus
LinuxLinuxb4c2b9593a1c4c3a718370e34af28e817fd5e5c6< dd74c80203842a21b2ebb9f70d1260d9aa20fa05affected
b4c2b9593a1c4c3a718370e34af28e817fd5e5c6< 6f6183a39533d727deaa5061cadae6dd9e6744d0affected
5.18affected
< 5.18unaffected
7.1.5≤ 7.1.*unaffected
7.2≤ *unaffected
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I. Basic Information for CVE-2026-72423

Vulnerability Information
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Vulnerability Title
bpf: Guard conntrack opts error writes
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Guard conntrack opts error writes The conntrack lookup and allocation kfuncs take an opts pointer together with an opts__sz argument. The verifier checks only the memory range described by opts__sz, but the wrappers unconditionally write opts->error whenever the internal lookup or allocation helper returns an error. For an invalid size smaller than the end of opts->error, that write can land outside the verifier-checked range. Keep returning NULL for invalid arguments, but only report the error through opts->error when the supplied size includes the field. This preserves error reporting for the supported 12-byte and 16-byte layouts, and for other invalid sizes that still include opts->error.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux b4c2b9593a1c4c3a718370e34af28e817fd5e5c6 ~ dd74c80203842a21b2ebb9f70d1260d9aa20fa05 -
LinuxLinux 5.18 -

II. Public POCs for CVE-2026-72423

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III. Intelligence Information for CVE-2026-72423

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Patches & Fixes for CVE-2026-72423 (1)

Same Patch Batch · Linux · 2026-08-15 · 846 CVEs total

CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-724639.8 CRITICALxfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-722489.8 CRITICALnetfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-723819.8 CRITICALksmbd: fix use-after-free of fp->owner.name in durable handle owner check
CVE-2026-724779.8 CRITICALfs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-724739.8 CRITICALxprtrdma: Decouple req recycling from RPC completion
CVE-2026-724729.8 CRITICALnfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-744069.8 CRITICALvxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
CVE-2026-722229.8 CRITICALsunrpc: pin svc_xprt across the asynchronous TLS handshake callback
CVE-2026-721379.8 CRITICALxfrm: nat_keepalive: avoid double free on send error
CVE-2026-743769.8 CRITICALmd/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-722269.8 CRITICALbatman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-722349.8 CRITICALbatman-adv: access unicast_ttvn skb->data only after skb realloc

Showing top 20 of 846 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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