CVE-2024-43890: linux kernel Integer Overflow — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix overflow in get_free_elt() "tracing_map->next_elt" in get_free_elt() is at risk of overflowing. Once it overflows, new elements can still be inserted into the tracing_map even though the maximum number of elements (`max_elts`) has been reached. Continuing to insert elements after the overflow could result in the tracing_map containing "tracing_map->max_size" elements, leaving no empty entries. If any attempt is made to insert an element into a full tracing_map using `__tracing_map_insert()`, it will cause an infinite loop with preemption disabled, leading to a CPU hang problem. Fix this by preventing any further increments to "tracing_map->next_elt" once it reaches "tracing_map->max_elt".

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.7 — 4.19.320
linux	linux_kernel	4.20 — 5.4.282
linux	linux_kernel	5.5 — 5.10.224
linux	linux_kernel	5.11 — 5.15.165
linux	linux_kernel	5.16 — 6.1.105
linux	linux_kernel	6.2 — 6.6.46
linux	linux_kernel	6.7 — 6.10.5
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/236bb4690773ab6869b40bedc7bc8d889e36f9d6 https://git.kernel.org/stable/c/302ceb625d7b990db205a15e371f9a71238de91c https://git.kernel.org/stable/c/788ea62499b3c18541fd6d621964d8fafbc4aec5 https://git.kernel.org/stable/c/a172c7b22bc2feaf489cfc6d6865f7237134fdf8 https://git.kernel.org/stable/c/bcf86c01ca4676316557dd482c8416ece8c2e143 https://git.kernel.org/stable/c/cd10d186a5409a1fe6e976df82858e9773a698da https://git.kernel.org/stable/c/d3e4dbc2858fe85d1dbd2e72a9fc5dea988b5c18 https://git.kernel.org/stable/c/eb223bf01e688dfe37e813c8988ee11c8c9f8d0a

Other References

https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://cert-portal.siemens.com/productcert/html/ssa-265688.html https://cert-portal.siemens.com/productcert/html/ssa-355557.html https://cert-portal.siemens.com/productcert/html/ssa-613116.html

Frequently Asked Questions

What is CVE-2024-43890? +

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix overflow in get_free_elt() "tracing_map->next_elt" in get_free_elt() is at risk of overflowing. Once it overflows, new elements can still be inserted into the tracing_map even though the maximum number of elements (`max_elts`) has been reached. Continuing to insert elements after the overflow could result in the tracing_map containing "tracing_map->max_size" elements, leaving no empty entries. If any attempt is made to insert an element into a full tracing_map using `__tracing_map_insert()`, it will cause an infinite loop with preemption disabled, leading to a CPU hang problem. Fix this by preventing any further increments to "tracing_map->next_elt" once it reaches "tracing_map->max_elt". It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-43890? +

CVE-2024-43890 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-43890? +

CVE-2024-43890 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-43890? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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