CyberSecBulletin
CVE-2024-26665NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2024-26665 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 e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d, d964dd1bc1452594b4207d9229c157d9386e5d8a, e37cde7a5716466ff2a76f7f27f0a29b05b9a732 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 0.68% chance of exploitation within 30 days, higher than 53% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d or d964dd1bc1452594b4207d9229c157d9386e5d8a or e37cde7a5716466ff2a76f7f27f0a29b05b9a732 or 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.210 or 5.15.149 or 6.1.78 or 6.6.17, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f up to, but not including, e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d; 4cb47a8644cc9eb8ec81190a50e79e6530d0297f up to, but not including, d964dd1bc1452594b4207d9229c157d9386e5d8a; 4cb47a8644cc9eb8ec81190a50e79e6530d0297f up to, but not including, e37cde7a5716466ff2a76f7f27f0a29b05b9a732; 4cb47a8644cc9eb8ec81190a50e79e6530d0297f up to, but not including, 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1; 4cb47a8644cc9eb8ec81190a50e79e6530d0297f up to, but not including, 7dc9feb8b1705cf00de20563b6bc4831f4c99dab; 4cb47a8644cc9eb8ec81190a50e79e6530d0297f up to, but not including, d75abeec401f8c86b470e7028a13fcdc87e5dd06; 5.9e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d, d964dd1bc1452594b4207d9229c157d9386e5d8a, e37cde7a5716466ff2a76f7f27f0a29b05b9a732, 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1, 7dc9feb8b1705cf00de20563b6bc4831f4c99dab, d75abeec401f8c86b470e7028a13fcdc87e5dd06
LinuxLinux Kernel5.9 up to, but not including, 5.10.210; 5.11 up to, but not including, 5.15.149; 5.16 up to, but not including, 6.1.78; 6.2 up to, but not including, 6.6.17; 6.7 up to, but not including, 6.7.5; 6.85.10.210, 5.15.149, 6.1.78, 6.6.17, 6.7.5
DebianDebian Linux10.0Not stated

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.

Scoring systemScoreSeverityScored by
CVSS 3.19.1CriticalCNA
CVSS 3.17.1HighNVD

Official description

In the Linux kernel, the following vulnerability has been resolved: tunnels: fix out of bounds access when building IPv6 PMTU error If the ICMPv6 error is built from a non-linear skb we get the following splat, BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240 Read of size 4 at addr ffff88811d402c80 by task netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 ... kasan_report+0xd8/0x110 do_csum+0x220/0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32a0 br_dev_queue_push_xmit+0x39d/0x6a0 Use skb_checksum instead of csum_partial who cannot deal with non-linear SKBs.

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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