CyberSecBulletin
CVE-2024-44983NVD status: Modified

Linux: Use of Uninitialized Resource

Published Updated By the CyberSecBulletin desk

CVE-2024-44983 is a high-severity use of uninitialized resource 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 c05155cc455785916164aa5e1b4605a2ae946537, d9384ae7aec46036d248d1c2c2757e471ab486c3, 0279c35d242d037abeb73d60d06a6d1bb7f672d9 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 0.25% 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 c05155cc455785916164aa5e1b4605a2ae946537 or d9384ae7aec46036d248d1c2c2757e471ab486c3 or 0279c35d242d037abeb73d60d06a6d1bb7f672d9 or 043a18bb6cf16adaa2f8642acfde6e8956a9caaa, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.166 or 6.1.107 or 6.6.48 or 6.10.7, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux4cd91f7c290f64fe430867ddbae10bff34657b6a up to, but not including, c05155cc455785916164aa5e1b4605a2ae946537; 4cd91f7c290f64fe430867ddbae10bff34657b6a up to, but not including, d9384ae7aec46036d248d1c2c2757e471ab486c3; 4cd91f7c290f64fe430867ddbae10bff34657b6a up to, but not including, 0279c35d242d037abeb73d60d06a6d1bb7f672d9; 4cd91f7c290f64fe430867ddbae10bff34657b6a up to, but not including, 043a18bb6cf16adaa2f8642acfde6e8956a9caaa; 4cd91f7c290f64fe430867ddbae10bff34657b6a up to, but not including, 6ea14ccb60c8ab829349979b22b58a941ec4a3ee; 5.13c05155cc455785916164aa5e1b4605a2ae946537, d9384ae7aec46036d248d1c2c2757e471ab486c3, 0279c35d242d037abeb73d60d06a6d1bb7f672d9, 043a18bb6cf16adaa2f8642acfde6e8956a9caaa, 6ea14ccb60c8ab829349979b22b58a941ec4a3ee
LinuxLinux Kernel5.13 up to, but not including, 5.15.166; 5.16 up to, but not including, 6.1.107; 6.2 up to, but not including, 6.6.48; 6.7 up to, but not including, 6.10.7; 6.115.15.166, 6.1.107, 6.6.48, 6.10.7

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: netfilter: flowtable: validate vlan header Ensure there is sufficient room to access the protocol field of the VLAN header, validate it once before the flowtable lookup. ===================================================== BUG: KMSAN: uninit-value in nf_flow_offload_inet_hook+0x45a/0x5f0 net/netfilter/nf_flow_table_inet.c:32 nf_flow_offload_inet_hook+0x45a/0x5f0 net/netfilter/nf_flow_table_inet.c:32 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626 nf_hook_ingress include/linux/netfilter_netdev.h:34 [inline] nf_ingress net/core/dev.c:5440 [inline]

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

The underlying weakness: Use of Uninitialized Resource

The product uses or accesses a resource that has not been initialized.

How developers prevent this class of flaw

  • Explicitly initialize the resource before use. If this is performed through an API function or standard procedure, follow all required steps.
  • Pay close attention to complex conditionals that affect initialization, since some branches might not perform the initialization.
  • Avoid race conditions (CWE-362) during initialization routines.

More Use of Uninitialized Resource vulnerabilities (CWE-908)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Recent Use of Uninitialized Resource vulnerabilities

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