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Vulnerability Details :

CVE-2025-38563

Summary
Assigner-Linux
Assigner Org ID-416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published At-19 Aug, 2025 | 17:02
Updated At-03 Nov, 2025 | 17:39
Rejected At-
Credits

perf/core: Prevent VMA split of buffer mappings

In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page with the ringbuffer and additionally the auxiliary buffer, when the event supports it. Once the first mapping is established, subsequent mapping have to use the same offset and the same size in both cases. The reference counting for the ringbuffer and the auxiliary buffer depends on this being correct. Though perf does not prevent that a related mapping is split via mmap(2), munmap(2) or mremap(2). A split of a VMA results in perf_mmap_open() calls, which take reference counts, but then the subsequent perf_mmap_close() calls are not longer fulfilling the offset and size checks. This leads to reference count leaks. As perf already has the requirement for subsequent mappings to match the initial mapping, the obvious consequence is that VMA splits, caused by resizing of a mapping or partial unmapping, have to be prevented. Implement the vm_operations_struct::may_split() callback and return unconditionally -EINVAL. That ensures that the mapping offsets and sizes cannot be changed after the fact. Remapping to a different fixed address with the same size is still possible as it takes the references for the new mapping and drops those of the old mapping.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Linux
Assigner Org ID:416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published At:19 Aug, 2025 | 17:02
Updated At:03 Nov, 2025 | 17:39
Rejected At:
▼CVE Numbering Authority (CNA)
perf/core: Prevent VMA split of buffer mappings

In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page with the ringbuffer and additionally the auxiliary buffer, when the event supports it. Once the first mapping is established, subsequent mapping have to use the same offset and the same size in both cases. The reference counting for the ringbuffer and the auxiliary buffer depends on this being correct. Though perf does not prevent that a related mapping is split via mmap(2), munmap(2) or mremap(2). A split of a VMA results in perf_mmap_open() calls, which take reference counts, but then the subsequent perf_mmap_close() calls are not longer fulfilling the offset and size checks. This leads to reference count leaks. As perf already has the requirement for subsequent mappings to match the initial mapping, the obvious consequence is that VMA splits, caused by resizing of a mapping or partial unmapping, have to be prevented. Implement the vm_operations_struct::may_split() callback and return unconditionally -EINVAL. That ensures that the mapping offsets and sizes cannot be changed after the fact. Remapping to a different fixed address with the same size is still possible as it takes the references for the new mapping and drops those of the old mapping.

Affected Products
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • kernel/events/core.c
Default Status
unaffected
Versions
Affected
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before e4346ffec2c44d6b0be834d59b20632b5bb5729e (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before d52451a9210f2e5a079ba052918c93563518a9ff (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before 3bd518cc7ea61076bcd725e36ff0e690754977c0 (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before 7b84cb58d1f0aa07656802eae24689566e5f5b1b (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before 6757a31a8e295ae4f01717a954afda173f25a121 (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before e529888b7e8092912dd8789bdfc76685ccd2ff5f (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before ff668930871e0198c7f4e325058b8b7c286787bd (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before 65311aad4c808bedad0c05d9bb8b06c47dae73eb (git)
  • From 45bfb2e50471abbbfd83d40d28c986078b0d24ff before b024d7b56c77191cde544f838debb7f8451cd0d6 (git)
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • kernel/events/core.c
Default Status
affected
Versions
Affected
  • 4.1
Unaffected
  • From 0 before 4.1 (semver)
  • From 5.4.297 through 5.4.* (semver)
  • From 5.10.241 through 5.10.* (semver)
  • From 5.15.190 through 5.15.* (semver)
  • From 6.1.148 through 6.1.* (semver)
  • From 6.6.102 through 6.6.* (semver)
  • From 6.12.42 through 6.12.* (semver)
  • From 6.15.10 through 6.15.* (semver)
  • From 6.16.1 through 6.16.* (semver)
  • From 6.17 through * (original_commit_for_fix)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://git.kernel.org/stable/c/e4346ffec2c44d6b0be834d59b20632b5bb5729e
N/A
https://git.kernel.org/stable/c/d52451a9210f2e5a079ba052918c93563518a9ff
N/A
https://git.kernel.org/stable/c/3bd518cc7ea61076bcd725e36ff0e690754977c0
N/A
https://git.kernel.org/stable/c/7b84cb58d1f0aa07656802eae24689566e5f5b1b
N/A
https://git.kernel.org/stable/c/6757a31a8e295ae4f01717a954afda173f25a121
N/A
https://git.kernel.org/stable/c/e529888b7e8092912dd8789bdfc76685ccd2ff5f
N/A
https://git.kernel.org/stable/c/ff668930871e0198c7f4e325058b8b7c286787bd
N/A
https://git.kernel.org/stable/c/65311aad4c808bedad0c05d9bb8b06c47dae73eb
N/A
https://git.kernel.org/stable/c/b024d7b56c77191cde544f838debb7f8451cd0d6
N/A
https://www.zerodayinitiative.com/advisories/ZDI-25-873/
N/A
Hyperlink: https://git.kernel.org/stable/c/e4346ffec2c44d6b0be834d59b20632b5bb5729e
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/d52451a9210f2e5a079ba052918c93563518a9ff
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/3bd518cc7ea61076bcd725e36ff0e690754977c0
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/7b84cb58d1f0aa07656802eae24689566e5f5b1b
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/6757a31a8e295ae4f01717a954afda173f25a121
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/e529888b7e8092912dd8789bdfc76685ccd2ff5f
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/ff668930871e0198c7f4e325058b8b7c286787bd
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/65311aad4c808bedad0c05d9bb8b06c47dae73eb
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/b024d7b56c77191cde544f838debb7f8451cd0d6
Resource: N/A
Hyperlink: https://www.zerodayinitiative.com/advisories/ZDI-25-873/
Resource: N/A
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
N/A
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
N/A
Hyperlink: https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Resource: N/A
Hyperlink: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Resource: N/A
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published At:19 Aug, 2025 | 17:15
Updated At:08 Jan, 2026 | 21:03

In the Linux kernel, the following vulnerability has been resolved: perf/core: Prevent VMA split of buffer mappings The perf mmap code is careful about mmap()'ing the user page with the ringbuffer and additionally the auxiliary buffer, when the event supports it. Once the first mapping is established, subsequent mapping have to use the same offset and the same size in both cases. The reference counting for the ringbuffer and the auxiliary buffer depends on this being correct. Though perf does not prevent that a related mapping is split via mmap(2), munmap(2) or mremap(2). A split of a VMA results in perf_mmap_open() calls, which take reference counts, but then the subsequent perf_mmap_close() calls are not longer fulfilling the offset and size checks. This leads to reference count leaks. As perf already has the requirement for subsequent mappings to match the initial mapping, the obvious consequence is that VMA splits, caused by resizing of a mapping or partial unmapping, have to be prevented. Implement the vm_operations_struct::may_split() callback and return unconditionally -EINVAL. That ensures that the mapping offsets and sizes cannot be changed after the fact. Remapping to a different fixed address with the same size is still possible as it takes the references for the new mapping and drops those of the old mapping.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.17.8HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Type: Primary
Version: 3.1
Base score: 7.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CPE Matches
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 4.1(inclusive) to 5.4.297(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 5.5(inclusive) to 5.10.241(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 5.11(inclusive) to 5.15.190(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 5.16(inclusive) to 6.1.148(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 6.2(inclusive) to 6.6.102(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 6.7(inclusive) to 6.12.42(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 6.13(inclusive) to 6.15.10(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux Kernel Organization, Inc
linux
>>linux_kernel>>Versions from 6.16(inclusive) to 6.16.1(exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Debian GNU/Linux
debian
>>debian_linux>>11.0
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
NVD-CWE-noinfoPrimarynvd@nist.gov
CWE ID: NVD-CWE-noinfo
Type: Primary
Source: nvd@nist.gov
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://git.kernel.org/stable/c/3bd518cc7ea61076bcd725e36ff0e690754977c0416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/65311aad4c808bedad0c05d9bb8b06c47dae73eb416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/6757a31a8e295ae4f01717a954afda173f25a121416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/7b84cb58d1f0aa07656802eae24689566e5f5b1b416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/b024d7b56c77191cde544f838debb7f8451cd0d6416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/d52451a9210f2e5a079ba052918c93563518a9ff416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/e4346ffec2c44d6b0be834d59b20632b5bb5729e416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/e529888b7e8092912dd8789bdfc76685ccd2ff5f416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://git.kernel.org/stable/c/ff668930871e0198c7f4e325058b8b7c286787bd416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
https://www.zerodayinitiative.com/advisories/ZDI-25-873/416baaa9-dc9f-4396-8d5f-8c081fb06d67
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlaf854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Mailing List
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlaf854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Mailing List
Hyperlink: https://git.kernel.org/stable/c/3bd518cc7ea61076bcd725e36ff0e690754977c0
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/65311aad4c808bedad0c05d9bb8b06c47dae73eb
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/6757a31a8e295ae4f01717a954afda173f25a121
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/7b84cb58d1f0aa07656802eae24689566e5f5b1b
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/b024d7b56c77191cde544f838debb7f8451cd0d6
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/d52451a9210f2e5a079ba052918c93563518a9ff
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/e4346ffec2c44d6b0be834d59b20632b5bb5729e
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/e529888b7e8092912dd8789bdfc76685ccd2ff5f
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://git.kernel.org/stable/c/ff668930871e0198c7f4e325058b8b7c286787bd
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Patch
Hyperlink: https://www.zerodayinitiative.com/advisories/ZDI-25-873/
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource:
Third Party Advisory
Hyperlink: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Mailing List
Hyperlink: https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Mailing List

Change History

0
Information is not available yet

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CVE-2025-21855
Matching Score-8
Assigner-kernel.org
ShareView Details
Matching Score-8
Assigner-kernel.org
CVSS Score-7.8||HIGH
EPSS-0.04% / 11.21%
||
7 Day CHG~0.00%
Published-12 Mar, 2025 | 09:42
Updated-03 Nov, 2025 | 20:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
ibmvnic: Don't reference skb after sending to VIOS

In the Linux kernel, the following vulnerability has been resolved: ibmvnic: Don't reference skb after sending to VIOS Previously, after successfully flushing the xmit buffer to VIOS, the tx_bytes stat was incremented by the length of the skb. It is invalid to access the skb memory after sending the buffer to the VIOS because, at any point after sending, the VIOS can trigger an interrupt to free this memory. A race between reading skb->len and freeing the skb is possible (especially during LPM) and will result in use-after-free: ================================================================== BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic] Read of size 4 at addr c00000024eb48a70 by task hxecom/14495 <...> Call Trace: [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable) [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0 [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8 [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0 [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic] [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358 <...> Freed by task 0: kasan_save_stack+0x34/0x68 kasan_save_track+0x2c/0x50 kasan_save_free_info+0x64/0x108 __kasan_mempool_poison_object+0x148/0x2d4 napi_skb_cache_put+0x5c/0x194 net_tx_action+0x154/0x5b8 handle_softirqs+0x20c/0x60c do_softirq_own_stack+0x6c/0x88 <...> The buggy address belongs to the object at c00000024eb48a00 which belongs to the cache skbuff_head_cache of size 224 ==================================================================

Action-Not Available
Vendor-Linux Kernel Organization, Inc
Product-linux_kernelLinux
CWE ID-CWE-416
Use After Free
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