CyberSecBulletin
CVE-2026-64411NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-64411 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 4c046ca4e35a83ea32f6e748f54139f5fe2a1d01, ab63ccefb9c71627f957a0724c2b9ebc869c6f20, c6f539311e58e76aa96feef0f1572b13a564f8a2 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 0.13% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 4c046ca4e35a83ea32f6e748f54139f5fe2a1d01 or ab63ccefb9c71627f957a0724c2b9ebc869c6f20 or c6f539311e58e76aa96feef0f1572b13a564f8a2 or 2664f537ca5bcb2ef3fac2683dcca602e51fad24, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.261 or 5.15.212 or 6.1.178 or 6.6.145, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 4c046ca4e35a83ea32f6e748f54139f5fe2a1d01; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, ab63ccefb9c71627f957a0724c2b9ebc869c6f20; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, c6f539311e58e76aa96feef0f1572b13a564f8a2; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 2664f537ca5bcb2ef3fac2683dcca602e51fad24; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 7436da6c1bc44654b7f11a17e746f6999fd37250; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, b6183b1b88a722b6d8ea0cecc99eba168a15e0be; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, a622d2e9608c9dff47fc2e5759ac7aa3a836b45d; and 1 more ranges4c046ca4e35a83ea32f6e748f54139f5fe2a1d01, ab63ccefb9c71627f957a0724c2b9ebc869c6f20, c6f539311e58e76aa96feef0f1572b13a564f8a2, 2664f537ca5bcb2ef3fac2683dcca602e51fad24, 7436da6c1bc44654b7f11a17e746f6999fd37250, 6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)V3.1.6 and later; V3.1.7 and laterNot stated
LinuxLinux Kernel2.6.12.1 up to, but not including, 5.10.261; 5.11 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, 7.1.4; 2.6.12; and 1 more ranges5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39

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
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
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
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

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

Official description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: terminate table name before find_table_lock() update_counters() and compat_update_counters() forward a user-supplied 32-byte table name to find_table_lock() without NUL-terminating it. On a lookup miss, find_inlist_lock() calls try_then_request_module(..., "%s%s", "ebtable_", name), and vsnprintf() reads past the name field and the stack object until it hits a zero byte. BUG: KASAN: stack-out-of-bounds in string (lib/vsprintf.c:648 lib/vsprintf.c:730) Read of size 1 at addr ffff8880119dfb20 by task exploit/147 Call Trace: ... string (lib/vsprintf.c:648 lib/vsprintf.c:730) vsnprintf (lib/vsprintf.c:2945) __request_module (kernel/module/kmod.c:150) do_update_counters.isra.0 (net/bridge/netfilter/ebtables.c:371 net/bridge/netfilter/ebtables.c:380) update_counters (net/bridge/netfilter/ebtables.c:1440) do_ebt_set_ctl (net/bridge/netfilter/ebtables.c:2573) nf_setsockopt (net/netfilter/nf_sockopt.c:101) ip_setsockopt (net/ipv4/ip_sockglue.c:1424) raw_setsockopt (net/ipv4/raw.c:847) __sys_setsockopt (net/socket.c:2393) ... compat_do_replace() shares the same unterminated name via compat_copy_ebt_replace_from_user(); terminate it there too so all find_table_lock() callers behave alike. The other callers already terminate the name after the copy.

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: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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