CVE-2022-49345
Linux Kernel Xfrm EXPORT_SYMBOL Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: net: xfrm: unexport __init-annotated xfrm4_protocol_init() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it has been broken for a decade. Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds. There are two ways to fix it: - Remove __init - Remove EXPORT_SYMBOL I chose the latter for this case because the only in-tree call-site, net/ipv4/xfrm4_policy.c is never compiled as modular. (CONFIG_XFRM is boolean)
INFO
Published Date :
Feb. 26, 2025, 7:01 a.m.
Last Modified :
Feb. 26, 2025, 7:01 a.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2022-49345.
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The following table lists the changes that have been made to the
CVE-2022-49345 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 26, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: net: xfrm: unexport __init-annotated xfrm4_protocol_init() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it has been broken for a decade. Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds. There are two ways to fix it: - Remove __init - Remove EXPORT_SYMBOL I chose the latter for this case because the only in-tree call-site, net/ipv4/xfrm4_policy.c is never compiled as modular. (CONFIG_XFRM is boolean) Added Reference https://git.kernel.org/stable/c/2b253fbc9f7b5db18d716436bdcf8ecef09fd63d Added Reference https://git.kernel.org/stable/c/31f3c6a4dcd3260a386e62cef2d5b36e902600a1 Added Reference https://git.kernel.org/stable/c/4a388f08d8784af48f352193d2b72aaf167a57a1 Added Reference https://git.kernel.org/stable/c/85a055c03691e51499123194a14a0c249cf33227 Added Reference https://git.kernel.org/stable/c/be3884d5cd04ccd58294b83a02d70b7c5fca19d3 Added Reference https://git.kernel.org/stable/c/c58d82a1264813e69119c13e9804e2e60b664ad5 Added Reference https://git.kernel.org/stable/c/e04d59cfe0c0129df7aba7ef7bb17b96be2a64f2 Added Reference https://git.kernel.org/stable/c/e53cd3814504b2cadaba4d5a8a07eeea9ddacd03 Added Reference https://git.kernel.org/stable/c/ef6d2354de238b065d8799c80da4be9a6af18e39
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-49345 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2022-49345
weaknesses.