CVE-2022-50569
xfrm: Update ipcomp_scratches with NULL when freed
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: Update ipcomp_scratches with NULL when freed Currently if ipcomp_alloc_scratches() fails to allocate memory ipcomp_scratches holds obsolete address. So when we try to free the percpu scratches using ipcomp_free_scratches() it tries to vfree non existent vm area. Described below: static void * __percpu *ipcomp_alloc_scratches(void) { ... scratches = alloc_percpu(void *); if (!scratches) return NULL; ipcomp_scratches does not know about this allocation failure. Therefore holding the old obsolete address. ... } So when we free, static void ipcomp_free_scratches(void) { ... scratches = ipcomp_scratches; Assigning obsolete address from ipcomp_scratches if (!scratches) return; for_each_possible_cpu(i) vfree(*per_cpu_ptr(scratches, i)); Trying to free non existent page, causing warning: trying to vfree existent vm area. ... } Fix this breakage by updating ipcomp_scrtches with NULL when scratches is freed
INFO
Published Date :
Oct. 22, 2025, 2:15 p.m.
Last Modified :
Oct. 22, 2025, 9:12 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to a patched version.
- Verify the integrity of the kernel installation.
- Reboot the system after updating.
References to Advisories, Solutions, and Tools
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CVE-2022-50569.
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associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
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approaches employed by adversaries to exploit the CVE-2022-50569
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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CVE-2022-50569 vulnerability anywhere in the article.
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CVE-2022-50569 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
Oct. 22, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: xfrm: Update ipcomp_scratches with NULL when freed Currently if ipcomp_alloc_scratches() fails to allocate memory ipcomp_scratches holds obsolete address. So when we try to free the percpu scratches using ipcomp_free_scratches() it tries to vfree non existent vm area. Described below: static void * __percpu *ipcomp_alloc_scratches(void) { ... scratches = alloc_percpu(void *); if (!scratches) return NULL; ipcomp_scratches does not know about this allocation failure. Therefore holding the old obsolete address. ... } So when we free, static void ipcomp_free_scratches(void) { ... scratches = ipcomp_scratches; Assigning obsolete address from ipcomp_scratches if (!scratches) return; for_each_possible_cpu(i) vfree(*per_cpu_ptr(scratches, i)); Trying to free non existent page, causing warning: trying to vfree existent vm area. ... } Fix this breakage by updating ipcomp_scrtches with NULL when scratches is freed Added Reference https://git.kernel.org/stable/c/03155680191ef0f004b1d6a5714c5b8cd271ab61 Added Reference https://git.kernel.org/stable/c/18373ed500f7cd53e24d9b0bd0f1c09d78dba87e Added Reference https://git.kernel.org/stable/c/1e8abde895b3ac6a368cbdb372e8800c49e73a28 Added Reference https://git.kernel.org/stable/c/2c19945ce8095d065df550e7fe350cd5cc40c6e6 Added Reference https://git.kernel.org/stable/c/8a04d2fc700f717104bfb95b0f6694e448a4537f Added Reference https://git.kernel.org/stable/c/a39f456d62810c0efb43cead22f98d95b53e4b1a Added Reference https://git.kernel.org/stable/c/be81c44242b20fc3bdcc73480ef8aaee56f5d0b6 Added Reference https://git.kernel.org/stable/c/debca61df6bc2f65e020656c9c5b878d6b38d30f Added Reference https://git.kernel.org/stable/c/f3bdba4440d82e0da2b1bfc35d3836c8a8e00677