CVE-2025-38453
published 2025-07-25CVE-2025-38453: In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU syzbot reports that…
PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.15%
4.9th percentile
In the Linux kernel, the following vulnerability has been resolved:
io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
syzbot reports that defer/local task_work adding via msg_ring can hit
a request that has been freed:
CPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xd2/0x2b0 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
io_req_local_work_add io_uring/io_uring.c:1184 [inline]
__io_req_task_work_add+0x589/0x950 io_uring/io_uring.c:1252
io_msg_remote_post io_uring/msg_ring.c:103 [inline]
io_msg_data_remote io_uring/msg_ring.c:133 [inline]
__io_msg_ring_data+0x820/0xaa0 io_uring/msg_ring.c:151
io_msg_ring_data io_uring/msg_ring.c:173 [inline]
io_msg_ring+0x134/0xa00 io_uring/msg_ring.c:314
__io_issue_sqe+0x17e/0x4b0 io_uring/io_uring.c:1739
io_issue_sqe+0x165/0xfd0 io_uring/io_uring.c:1762
io_wq_submit_work+0x6e9/0xb90 io_uring/io_uring.c:1874
io_worker_handle_work+0x7cd/0x1180 io_uring/io-wq.c:642
io_wq_worker+0x42f/0xeb0 io_uring/io-wq.c:696
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
which is supposed to be safe with how requests are allocated. But msg
ring requests alloc and free on their own, and hence must defer freeing
to a sane time.
Add an rcu_head and use kfree_rcu() in both spots where requests are
freed. Only the one in io_msg_tw_complete() is strictly required as it
has been visible on the other ring, but use it consistently in the other
spot as well.
This should not cause any other issues outside of KASAN rightfully
complaining about it.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.16.3-1 (forky) | linux 6.16.3-1 (forky) |
| linux | linux | — | — |
| linux | linux | >= 0617bb500bfabf8447062f1e1edde92ed2b638f1 < 094ba14a471cc6c68078c7ad488539eaf32c2277 | 094ba14a471cc6c68078c7ad488539eaf32c2277 |
| linux | linux | >= 0617bb500bfabf8447062f1e1edde92ed2b638f1 < e5b3432f4a6b418b8bd8fc91f38efbf17a77167a | e5b3432f4a6b418b8bd8fc91f38efbf17a77167a |
| linux | linux | >= 0617bb500bfabf8447062f1e1edde92ed2b638f1 < fc582cd26e888b0652bc1494f252329453fd3b23 | fc582cd26e888b0652bc1494f252329453fd3b23 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.12.48-1 | 6.12.48-1 |
| linux | linux_kernel | >= 0 < 6.16.3-1 | 6.16.3-1 |
| linux | linux_kernel | >= 6.11 < 6.12.46 | 6.12.46 |
| linux | linux_kernel | >= 6.13 < 6.15.7 | 6.15.7 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5LOW
vendor_redhat5.5MEDIUM
vendor_ubuntu3.2LOW
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
linux-azure, linux-azure-6.14 vulnerabilities
osv·2025-12-15·CVSS 3.2
CVE-2024-36331 [LOW] linux-azure, linux-azure-6.14 vulnerabilities
linux-azure, linux-azure-6.14 vulnerabilities
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
-
OSV
linux-gcp-6.14, linux-raspi vulnerabilities
osv·2025-12-04·CVSS 3.2
CVE-2024-36331 [LOW] linux-gcp-6.14, linux-raspi vulnerabilities
linux-gcp-6.14, linux-raspi vulnerabilities
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine subsystem;
- EDAC drivers;
- GPU drivers;
- HID subsystem;
- Har
OSV
linux-aws-6.14, linux-oracle-6.14 vulnerabilities
osv·2025-11-26·CVSS 3.2
CVE-2024-36331 [LOW] linux-aws-6.14, linux-oracle-6.14 vulnerabilities
linux-aws-6.14, linux-oracle-6.14 vulnerabilities
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine subsystem;
- EDAC drivers;
- GPU drivers;
- HID subsystem;
OSV
linux-oem-6.14 vulnerabilities
osv·2025-11-21·CVSS 3.2
CVE-2024-36331 [LOW] linux-oem-6.14 vulnerabilities
linux-oem-6.14 vulnerabilities
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine subsystem;
- GPU drivers;
- HID subsystem;
- Hardware monitoring drivers;
- I
OSV
linux, linux-aws, linux-gcp, linux-hwe-6.14, linux-oracle, linux-realtime vulnerabilities
osv·2025-11-21·CVSS 3.2
CVE-2024-36331 [LOW] linux, linux-aws, linux-gcp, linux-hwe-6.14, linux-oracle, linux-realtime vulnerabilities
linux, linux-aws, linux-gcp, linux-hwe-6.14, linux-oracle, linux-realtime vulnerabilities
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine subsystem;
- EDAC
OSV
linux-realtime-6.14 vulnerabilities
osv·2025-11-21·CVSS 3.2
CVE-2024-36331 [LOW] linux-realtime-6.14 vulnerabilities
linux-realtime-6.14 vulnerabilities
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine subsystem;
- EDAC drivers;
- GPU drivers;
- HID subsystem;
- Hardware mo
OSV
CVE-2025-38453: In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU syzbot reports that
osv·2025-07-25·CVSS 5.5
CVE-2025-38453 [MEDIUM] CVE-2025-38453: In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU syzbot reports that
In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU syzbot reports that defer/local task_work adding via msg_ring can hit a request that has been freed: CPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 io_req_local_work_add io_uring/io_uring.c:1184 [inline] __io_req_task_work_add+0x589/0x950 io_uring/io_uring.c:1252 io_msg_remote_post io_uring/msg_ring.
GHSA
GHSA-9gq9-xvp8-xm4m: In the Linux kernel, the following vulnerability has been resolved:
io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
syzbot reports th
ghsa_unreviewed·2025-07-25
CVE-2025-38453 [MEDIUM] GHSA-9gq9-xvp8-xm4m: In the Linux kernel, the following vulnerability has been resolved:
io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
syzbot reports th
In the Linux kernel, the following vulnerability has been resolved:
io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
syzbot reports that defer/local task_work adding via msg_ring can hit
a request that has been freed:
CPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xd2/0x2b0 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
io_req_local_work_add io_uring/io_uring.c:1184 [inline]
__io_req_task_work_add+0x589/0x950 io_uring/io_uring.c:1252
io_msg_remote_post io_uring/msg_r
Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2025-12-15·CVSS 3.2
CVE-2025-38566 [LOW] Linux kernel (Azure) vulnerabilities
Title: Linux kernel (Azure) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the s
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2025-12-04·CVSS 3.2
CVE-2025-38493 [LOW] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine subsys
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2025-11-26·CVSS 3.2
CVE-2025-38566 [LOW] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine subsys
Ubuntu
Linux kernel (Real-time) vulnerabilities
vendor_ubuntu·2025-11-21·CVSS 3.2
CVE-2025-38566 [LOW] Linux kernel (Real-time) vulnerabilities
Title: Linux kernel (Real-time) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA e
Ubuntu
Linux kernel (OEM) vulnerabilities
vendor_ubuntu·2025-11-21·CVSS 3.2
CVE-2025-38493 [LOW] Linux kernel (OEM) vulnerabilities
Title: Linux kernel (OEM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- S390 architecture;
- x86 architecture;
- Network block device driver;
- Character device driver;
- Clock framework and drivers;
- Data acquisition framework and drivers;
- Hardware crypto device drivers;
- Device frequency scaling framework;
- DMA engine
Red Hat
kernel: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
vendor_redhat·2025-07-25·CVSS 5.5
CVE-2025-38453 [MEDIUM] CWE-825 kernel: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
kernel: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
In the Linux kernel, the following vulnerability has been resolved:
io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU
syzbot reports that defer/local task_work adding via msg_ring can hit
a request that has been freed:
CPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xd2/0x2b0 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
io_req_local_work_add io_uring/io_uring.c:1184 [inline]
__io_req_task_work_add+0
Debian
CVE-2025-38453: linux - In the Linux kernel, the following vulnerability has been resolved: io_uring/ms...
vendor_debian·2025·CVSS 5.5
CVE-2025-38453 [MEDIUM] CVE-2025-38453: linux - In the Linux kernel, the following vulnerability has been resolved: io_uring/ms...
In the Linux kernel, the following vulnerability has been resolved: io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU syzbot reports that defer/local task_work adding via msg_ring can hit a request that has been freed: CPU: 1 UID: 0 PID: 19356 Comm: iou-wrk-19354 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 io_req_local_work_add io_uring/io_uring.c:1184 [inline] __io_req_task_work_add+0x589/0x950 io_uring/io_uring.c:1252 io_msg_remote_post io_uring/msg_ring.
No detection rules found.
No public exploits indexed.
2025-07-25
Published