CyberSecBulletin
CVE-2026-64355NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-64355 is a critical-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 47baddc856ae7e93a565dd9deeb797999b179466, 07a4c11ee8ef4abcb39d922e9e410ae269671cdf, bccbab36ff228e0825eb85d9b0f9b8434cd0a399 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.51% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Linux to 47baddc856ae7e93a565dd9deeb797999b179466 or 07a4c11ee8ef4abcb39d922e9e410ae269671cdf or bccbab36ff228e0825eb85d9b0f9b8434cd0a399 or c5b4f5efcb55c1af3fe44ff712d31b7fb098a831, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.212 or 6.1.178 or 6.6.145 or 6.12.96, whichever matches your release line, or a later version.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 up to, but not including, 47baddc856ae7e93a565dd9deeb797999b179466; e624d4ed4aa8cc3c69d1359b0aaea539203ed266 up to, but not including, 07a4c11ee8ef4abcb39d922e9e410ae269671cdf; e624d4ed4aa8cc3c69d1359b0aaea539203ed266 up to, but not including, bccbab36ff228e0825eb85d9b0f9b8434cd0a399; e624d4ed4aa8cc3c69d1359b0aaea539203ed266 up to, but not including, c5b4f5efcb55c1af3fe44ff712d31b7fb098a831; e624d4ed4aa8cc3c69d1359b0aaea539203ed266 up to, but not including, a9bb2d9c798cb62a4050a991c27b752770c33afe; e624d4ed4aa8cc3c69d1359b0aaea539203ed266 up to, but not including, 51d07c12ca411e692c424ecdabf077f1e61a61be; e624d4ed4aa8cc3c69d1359b0aaea539203ed266 up to, but not including, aa496720618f1a6054f1c870bf10b4f6c99bf656; 5.1447baddc856ae7e93a565dd9deeb797999b179466, 07a4c11ee8ef4abcb39d922e9e410ae269671cdf, bccbab36ff228e0825eb85d9b0f9b8434cd0a399, c5b4f5efcb55c1af3fe44ff712d31b7fb098a831, a9bb2d9c798cb62a4050a991c27b752770c33afe, 51d07c12ca411e692c424ecdabf077f1e61a61be
LinuxLinux Kernel5.14 up to, but not including, 5.15.212; 5.16 up to, but not including, 6.1.178; 6.2 up to, but not including, 6.6.145; 6.7 up to, but not including, 6.12.96; 6.13 up to, but not including, 6.18.39; 6.19 up to, but not including, 7.1.45.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject fragmented frames in devmap Devmap broadcast redirects clone the packet for all but the last destination. For native XDP, that clone path copies only the linear xdp_frame data, while fragmented frames keep skb_shared_info in tailroom outside the linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but without valid frag metadata, and the later free path can interpret uninitialized tail data as skb_shared_info, leading to an out-of-bounds access during frame return. Reject fragmented native XDP frames in dev_map_enqueue_clone(). Add the same restriction to the generic XDP clone path in dev_map_redirect_clone(). Generic XDP represents fragmented packets as nonlinear skbs, and rejecting them here keeps clone-based broadcast support aligned between native and generic XDP.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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