CVE-2026-46195
published 2026-05-28CVE-2026-46195: In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building DACL pointers parse_sec_desc()…
PriorityP352critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.68%
48.1th percentile
In the Linux kernel, the following vulnerability has been resolved:
smb: client: validate dacloffset before building DACL pointers
parse_sec_desc(), build_sec_desc(), and the chown path in
id_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd
before proving a DACL header fits inside the returned security
descriptor.
On 32-bit builds a malicious server can return dacloffset near
U32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip
past the later pointer-based bounds checks. build_sec_desc() and
id_mode_to_cifs_acl() can then dereference DACL fields from the wrapped
pointer in the chmod/chown rewrite paths.
Validate dacloffset numerically before building any DACL pointer and
reuse the same helper at the three DACL entry points.
Affected
61 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < 5de2665e913a10ad70aaeecf736b97276e83d995 | 5de2665e913a10ad70aaeecf736b97276e83d995 |
| linux | linux | >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < f9dc3be8f403c1216df73e57221f44b045e7ee0b | f9dc3be8f403c1216df73e57221f44b045e7ee0b |
| linux | linux | >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < ba7f71b6161c0943dafc367565e5843d16b7d505 | ba7f71b6161c0943dafc367565e5843d16b7d505 |
| linux | linux | >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7 | 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7 |
| linux | linux | >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < c688f3ed73d31943334ad2139cb02ec49664322a | c688f3ed73d31943334ad2139cb02ec49664322a |
| linux | linux | >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < 8bd07e417b6bda67e317920584e48cb6ee442a8a | 8bd07e417b6bda67e317920584e48cb6ee442a8a |
| linux | linux | >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < f98b48151cc502ada59d9778f0112d21f2586ca3 | f98b48151cc502ada59d9778f0112d21f2586ca3 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.12 < 6.6.140 | 6.6.140 |
| linux | linux_kernel | >= 6.13 < 6.18.30 | 6.18.30 |
| linux | linux_kernel | >= 6.19 < 7.0.7 | 7.0.7 |
| linux | linux_kernel | >= 6.7 < 6.12.88 | 6.12.88 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-5.15 | — | — |
| ubuntu | linux-azure-fde-5.15 | — | — |
| ubuntu | linux-azure-fips | — | — |
| ubuntu | linux-fips | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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a container. (CVE-2026-31431)
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Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
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- ATM drivers;
- RNBD block device driver;
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the floating point divider unit during speculative execution. A local
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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;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardware monitoring dr
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Title: Linux kernel (OEM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
- Scatterlist API;
- B.A.T.M.A.N. meshi
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Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- Block layer subsystem;
- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
- Scatterlist API;
- B.A.T.M.A.N. meshing protocol;
- Ethernet br
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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: smb: client: validate dacloffset before building DACL pointers
vendor_redhat·2026-05-28·CVSS 7.0
CVE-2026-46195 [HIGH] CWE-787 kernel: smb: client: validate dacloffset before building DACL pointers
kernel: smb: client: validate dacloffset before building DACL pointers
A flaw was found in the Linux kernel's Server Message Block (SMB) client. A malicious server can exploit this vulnerability on 32-bit systems by providing a crafted dacloffset value. This can cause a pointer wrap, leading to the dereferencing of invalid Discretionary Access Control List (DACL) fields during chmod or chown operations. This memory corruption could potentially allow the malicious server to bypass security mechanisms or cause a denial of service.
Package: kernel (Red Hat Enterprise Linux 10) - 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 (Re
VulDB
Linux Kernel up to 7.1-rc2 smb parse_sec_desc null pointer dereference (EUVD-2026-32822)
vuldb·2026-06-11·CVSS 9.8
CVE-2026-46195 [CRITICAL] Linux Kernel up to 7.1-rc2 smb parse_sec_desc null pointer dereference (EUVD-2026-32822)
A vulnerability classified as critical has been found in Linux Kernel up to 6.6.139/6.12.87/6.18.29/7.0.6/7.1-rc2. Impacted is the function parse_sec_desc of the component smb. The manipulation leads to null pointer dereference.
This vulnerability is documented as CVE-2026-46195. The attack requires being on the local network. There is not any exploit available.
It is recommended to upgrade the affected component.
GHSA
GHSA-rp7m-xq2f-r4cg: In the Linux kernel, the following vulnerability has been resolved:
smb: client: validate dacloffset before building DACL pointers
parse_sec_desc(),
ghsa_unreviewed·2026-05-28
CVE-2026-46195 GHSA-rp7m-xq2f-r4cg: In the Linux kernel, the following vulnerability has been resolved:
smb: client: validate dacloffset before building DACL pointers
parse_sec_desc(),
In the Linux kernel, the following vulnerability has been resolved:
smb: client: validate dacloffset before building DACL pointers
parse_sec_desc(), build_sec_desc(), and the chown path in
id_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd
before proving a DACL header fits inside the returned security
descriptor.
On 32-bit builds a malicious server can return dacloffset near
U32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip
past the later pointer-based bounds checks. build_sec_desc() and
id_mode_to_cifs_acl() can then dereference DACL fields from the wrapped
pointer in the chmod/chown rewrite paths.
Validate dacloffset numerically before building any DACL pointer and
reuse the same helper at the three DACL entry points.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7https://git.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8ahttps://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322ahttps://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3https://git.kernel.org/stable/c/f9dc3be8f403c1216df73e57221f44b045e7ee0bhttps://access.redhat.com/errata/RHSA-2026:21556https://access.redhat.com/errata/RHSA-2026:21706https://access.redhat.com/errata/RHSA-2026:21745https://access.redhat.com/security/cve/CVE-2026-46195https://bugzilla.redhat.com/show_bug.cgi?id=2482606https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46195.json
2026-05-28
Published