CVE-2026-46081
published 2026-05-27CVE-2026-46081: In the Linux kernel, the following vulnerability has been resolved: crypto: acomp - fix wrong pointer stored by acomp_save_req() acomp_save_req() stores…
PriorityP342high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.17%
6.3th percentile
In the Linux kernel, the following vulnerability has been resolved:
crypto: acomp - fix wrong pointer stored by acomp_save_req()
acomp_save_req() stores &req->chain in req->base.data. When
acomp_reqchain_done() is invoked on asynchronous completion, it receives
&req->chain as the data argument but casts it directly to struct
acomp_req. Since data points to the chain member, all subsequent field
accesses are at a wrong offset, resulting in memory corruption.
The issue occurs when an asynchronous hardware implementation, such as
the QAT driver, completes a request that uses the DMA virtual address
interface (e.g. acomp_request_set_src_dma()). This combination causes
crypto_acomp_compress() to enter the acomp_do_req_chain() path, which
sets acomp_reqchain_done() as the completion callback via
acomp_save_req().
With KASAN enabled, this manifests as a general protection fault in
acomp_reqchain_done():
general protection fault, probably for non-canonical address 0xe000040000000000
KASAN: probably user-memory-access in range [0x0000400000000000-0x0000400000000007]
RIP: 0010:acomp_reqchain_done+0x15b/0x4e0
Call Trace:
qat_comp_alg_callback+0x5d/0xa0 [intel_qat]
adf_ring_response_handler+0x376/0x8b0 [intel_qat]
adf_response_handler+0x60/0x170 [intel_qat]
tasklet_action_common+0x223/0x820
handle_softirqs+0x1ab/0x640
Fix this by storing the request itself in req->base.data instead of
&req->chain, so that acomp_reqchain_done() receives the correct pointer.
Simplify acomp_restore_req() accordingly to access req->chain directly.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 64929fe8c0a43508eee952cf57903a61c52601e7 < 343a5bf68a8ff9affcf2b70677ea4cf40c195ee4 | 343a5bf68a8ff9affcf2b70677ea4cf40c195ee4 |
| linux | linux | >= 64929fe8c0a43508eee952cf57903a61c52601e7 < 1a2785e5985627f2265ba7775949601a29ba0d1e | 1a2785e5985627f2265ba7775949601a29ba0d1e |
| linux | linux | >= 64929fe8c0a43508eee952cf57903a61c52601e7 < d7e20b9bd6c990773cf0c09e2642250b8a70263d | d7e20b9bd6c990773cf0c09e2642250b8a70263d |
| linux | linux_kernel | >= 6.16 < 6.18.27 | 6.18.27 |
| linux | linux_kernel | >= 6.19 < 7.0.4 | 7.0.4 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-fde | — | — |
| ubuntu | linux-gcp | — | — |
| ubuntu | linux-hwe-7.0 | — | — |
| ubuntu | linux-ibm | — | — |
| ubuntu | linux-nvidia | — | — |
| ubuntu | linux-oem-7.0 | — | — |
| ubuntu | linux-oracle | — | — |
| ubuntu | linux-raspi | — | — |
| ubuntu | linux-realtime | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
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Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2026-07-24·CVSS 2.0
CVE-2026-64107 [LOW] Linux kernel (Azure) vulnerabilities
Title: Linux kernel (Azure) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
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:
- x86 platfor
Ubuntu
Linux kernel (HWE) vulnerabilities
vendor_ubuntu·2026-07-20·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (HWE) vulnerabilities
Title: Linux kernel (HWE) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TC
Ubuntu
Linux kernel (NVIDIA) vulnerabilities
vendor_ubuntu·2026-07-06·CVSS 2.0
CVE-2026-46009 [LOW] Linux kernel (NVIDIA) vulnerabilities
Title: Linux kernel (NVIDIA) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
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;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Rados block device (RBD) driver;
- Compressed RAM block device driver;
- Character device driver;
- TPM device driver;
- Hardware crypto device drivers;
- EDAC drivers;
- GPU drivers;
- Greybus drive
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities
vendor_ubuntu·2026-07-02·CVSS 2.0
CVE-2026-46316 [LOW] Linux kernel (Raspberry Pi) vulnerabilities
Title: Linux kernel (Raspberry Pi) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
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;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Rados block device (RBD) driver;
- Compressed RAM block device driver;
- Character device driver;
- TPM device driver;
- Hardware crypto device drivers;
- EDAC drivers;
- GPU drivers;
- Greybus
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-01·CVSS 2.0
CVE-2026-46042 [LOW] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
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;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Rados block device (RBD) driver;
- Compressed RAM block device driver;
- Character device driver;
- TPM device driver;
- Hardware crypto device drivers;
- EDAC drivers;
- GPU drivers;
- Greybus drivers;
- HID
Ubuntu
Linux kernel (OEM) vulnerabilities
vendor_ubuntu·2026-07-01·CVSS 8.8
CVE-2026-46042 [HIGH] Linux kernel (OEM) vulnerabilities
Title: Linux kernel (OEM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)
It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (C
Red Hat
kernel: crypto: acomp - fix wrong pointer stored by acomp_save_req()
vendor_redhat·2026-05-27
CVE-2026-46081 CWE-843 kernel: crypto: acomp - fix wrong pointer stored by acomp_save_req()
kernel: crypto: acomp - fix wrong pointer stored by acomp_save_req()
A flaw was found in the Linux kernel's asynchronous compression (`acomp`) subsystem. When an asynchronous hardware implementation, such as the QAT driver, completes a request that uses the DMA virtual address interface, an incorrect pointer is stored. This leads to memory corruption within the `acomp_reqchain_done()` function, which can result in a denial of service (DoS) due to a general protection fault.
Package: kernel (Red Hat Enterprise Linux 10) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Not affected
Package: k
VulDB
Linux Kernel up to 6.18.26/7.0.3 QAT Driver acomp_save_req memory corruption
vuldb·2026-06-25·CVSS 7.8
CVE-2026-46081 [HIGH] Linux Kernel up to 6.18.26/7.0.3 QAT Driver acomp_save_req memory corruption
A vulnerability was found in Linux Kernel up to 6.18.26/7.0.3. It has been classified as critical. Affected is the function acomp_save_req of the component QAT Driver. This manipulation causes memory corruption.
This vulnerability appears as CVE-2026-46081. The attacker needs to be present on the local network. There is no available exploit.
Upgrading the affected component is recommended.
GHSA
GHSA-pp4v-xc4h-7x6m: In the Linux kernel, the following vulnerability has been resolved:
crypto: acomp - fix wrong pointer stored by acomp_save_req()
acomp_save_req() st
ghsa_unreviewed·2026-05-27
CVE-2026-46081 GHSA-pp4v-xc4h-7x6m: In the Linux kernel, the following vulnerability has been resolved:
crypto: acomp - fix wrong pointer stored by acomp_save_req()
acomp_save_req() st
In the Linux kernel, the following vulnerability has been resolved:
crypto: acomp - fix wrong pointer stored by acomp_save_req()
acomp_save_req() stores &req->chain in req->base.data. When
acomp_reqchain_done() is invoked on asynchronous completion, it receives
&req->chain as the data argument but casts it directly to struct
acomp_req. Since data points to the chain member, all subsequent field
accesses are at a wrong offset, resulting in memory corruption.
The issue occurs when an asynchronous hardware implementation, such as
the QAT driver, completes a request that uses the DMA virtual address
interface (e.g. acomp_request_set_src_dma()). This combination causes
crypto_acomp_compress() to enter the acomp_do_req_chain() path, which
sets acomp_reqchain_done() as the completion callback
No detection rules found.
No public exploits indexed.
2026-05-27
Published