CyberSecBulletin
CVE-2025-71133NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2025-71133 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 db93ae6fa66f1c61ae63400191195e3ee58021da, 305c02e541befe4a44ffde30ed374970f41aeb6c, fc23d05f0b3fb4d80657e7afebae2cae686b31c8 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 0.18% 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 db93ae6fa66f1c61ae63400191195e3ee58021da or 305c02e541befe4a44ffde30ed374970f41aeb6c or fc23d05f0b3fb4d80657e7afebae2cae686b31c8 or bf197c7c79ef6458d1ee84dd7db251b51784885f, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.198 or 6.1.160 or 6.6.120 or 6.12.64, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux915cc7ac0f8e2a23675ee896e87f17c7d3c47089 up to, but not including, db93ae6fa66f1c61ae63400191195e3ee58021da; 915cc7ac0f8e2a23675ee896e87f17c7d3c47089 up to, but not including, 305c02e541befe4a44ffde30ed374970f41aeb6c; 915cc7ac0f8e2a23675ee896e87f17c7d3c47089 up to, but not including, fc23d05f0b3fb4d80657e7afebae2cae686b31c8; 915cc7ac0f8e2a23675ee896e87f17c7d3c47089 up to, but not including, bf197c7c79ef6458d1ee84dd7db251b51784885f; 915cc7ac0f8e2a23675ee896e87f17c7d3c47089 up to, but not including, d9b9affd103f51b42322da4ed5ac025b560bc354; 915cc7ac0f8e2a23675ee896e87f17c7d3c47089 up to, but not including, 6f05611728e9d0ab024832a4f1abb74a5f5d0bb0; 5.14db93ae6fa66f1c61ae63400191195e3ee58021da, 305c02e541befe4a44ffde30ed374970f41aeb6c, fc23d05f0b3fb4d80657e7afebae2cae686b31c8, bf197c7c79ef6458d1ee84dd7db251b51784885f, d9b9affd103f51b42322da4ed5ac025b560bc354, 6f05611728e9d0ab024832a4f1abb74a5f5d0bb0
LinuxLinux Kernel5.14.1 up to, but not including, 5.15.198; 5.16 up to, but not including, 6.1.160; 6.2 up to, but not including, 6.6.120; 6.7 up to, but not including, 6.12.64; 6.13 up to, but not including, 6.18.4; 5.14; 6.195.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.4

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
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 NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: avoid invalid read in irdma_net_event irdma_net_event() should not dereference anything from "neigh" (alias "ptr") until it has checked that the event is NETEVENT_NEIGH_UPDATE. Other events come with different structures pointed to by "ptr" and they may be smaller than struct neighbour. Move the read of neigh->dev under the NETEVENT_NEIGH_UPDATE case. The bug is mostly harmless, but it triggers KASAN on debug kernels: BUG: KASAN: stack-out-of-bounds in irdma_net_event+0x32e/0x3b0 [irdma] Read of size 8 at addr ffffc900075e07f0 by task kworker/27:2/542554 CPU: 27 PID: 542554 Comm: kworker/27:2 Kdump: loaded Not tainted 5.14.0-630.el9.x86_64+debug #1 Hardware name: [...] Workqueue: events rt6_probe_deferred Call Trace: <IRQ> dump_stack_lvl+0x60/0xb0 print_address_description.constprop.0+0x2c/0x3f0 print_report+0xb4/0x270 kasan_report+0x92/0xc0 irdma_net_event+0x32e/0x3b0 [irdma] notifier_call_chain+0x9e/0x180 atomic_notifier_call_chain+0x5c/0x110 rt6_do_redirect+0xb91/0x1080 tcp_v6_err+0xe9b/0x13e0 icmpv6_notify+0x2b2/0x630 ndisc_redirect_rcv+0x328/0x530 icmpv6_rcv+0xc16/0x1360 ip6_protocol_deliver_rcu+0xb84/0x12e0 ip6_input_finish+0x117/0x240 ip6_input+0xc4/0x370 ipv6_rcv+0x420/0x7d0 __netif_receive_skb_one_core+0x118/0x1b0 process_backlog+0xd1/0x5d0 __napi_poll.constprop.0+0xa3/0x440 net_rx_action+0x78a/0xba0 handle_softirqs+0x2d4/0x9c0 do_softirq+0xad/0xe0 </IRQ>

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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