CVE-2026-43071
published 2026-05-05CVE-2026-43071: In the Linux kernel, the following vulnerability has been resolved: dcache: Limit the minimal number of bucket to two There is an OOB read problem on…
PriorityP346critical9.1CVSS 3.1
AVNACLPRNUINSUCHINAH
EPSS
0.39%
31.5th percentile
In the Linux kernel, the following vulnerability has been resolved:
dcache: Limit the minimal number of bucket to two
There is an OOB read problem on dentry_hashtable when user sets
'dhash_entries=1':
BUG: unable to handle page fault for address: ffff888b30b774b0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
Oops: Oops: 0000 [#1] SMP PTI
RIP: 0010:__d_lookup+0x56/0x120
Call Trace:
d_lookup.cold+0x16/0x5d
lookup_dcache+0x27/0xf0
lookup_one_qstr_excl+0x2a/0x180
start_dirop+0x55/0xa0
simple_start_creating+0x8d/0xa0
debugfs_start_creating+0x8c/0x180
debugfs_create_dir+0x1d/0x1c0
pinctrl_init+0x6d/0x140
do_one_initcall+0x6d/0x3d0
kernel_init_freeable+0x39f/0x460
kernel_init+0x2a/0x260
There will be only one bucket in dentry_hashtable when dhash_entries is
set as one, and d_hash_shift is calculated as 32 by dcache_init(). Then,
following process will access more than one buckets(which memory region
is not allocated) in dentry_hashtable:
d_lookup
b = d_hash(hash)
dentry_hashtable + ((u32)hashlen >> d_hash_shift)
// The C standard defines the behavior of right shift amounts
// exceeding the bit width of the operand as undefined. The
// result of '(u32)hashlen >> d_hash_shift' becomes 'hashlen',
// so 'b' will point to an unallocated memory region.
hlist_bl_for_each_entry_rcu(b)
hlist_bl_first_rcu(head)
h->first // read OOB!
Fix it by limiting the minimal number of dentry_hashtable bucket to two,
so that 'd_hash_shift' won't exceeds the bit width of type u32.
Affected
73 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 3.10.55 < 3.11 | 3.11 |
| linux | linux | >= 3.12.29 < 3.13 | 3.13 |
| linux | linux | >= 3.14.19 < 3.15 | 3.15 |
| linux | linux | >= 3.16.3 < 3.17 | 3.17 |
| linux | linux | >= 99d263d4c5b2f541dfacb5391e22e8c91ea982a6 < 45b06bb5ea96f75ad81d7ef446f832ea6b0026fe | 45b06bb5ea96f75ad81d7ef446f832ea6b0026fe |
| linux | linux | >= 99d263d4c5b2f541dfacb5391e22e8c91ea982a6 < 426ef05e82ee52c8d0e95fc0808b7383d8352d73 | 426ef05e82ee52c8d0e95fc0808b7383d8352d73 |
| linux | linux | >= 99d263d4c5b2f541dfacb5391e22e8c91ea982a6 < ddd57ebce245f9c7e2f6902a6c087d6186d2385d | ddd57ebce245f9c7e2f6902a6c087d6186d2385d |
| linux | linux | >= 99d263d4c5b2f541dfacb5391e22e8c91ea982a6 < 755b40903eff563768d4d96fd4ef51ec48adde3b | 755b40903eff563768d4d96fd4ef51ec48adde3b |
| linux | linux | >= 99d263d4c5b2f541dfacb5391e22e8c91ea982a6 < 5718df131ab78897a9dd1f2e71c3ba732d4392af | 5718df131ab78897a9dd1f2e71c3ba732d4392af |
| linux | linux | >= 99d263d4c5b2f541dfacb5391e22e8c91ea982a6 < 277cedabb0ab86baae83fa58218be13c6d3e5526 | 277cedabb0ab86baae83fa58218be13c6d3e5526 |
| linux | linux | >= 99d263d4c5b2f541dfacb5391e22e8c91ea982a6 < f08fe8891c3eeb63b73f9f1f6d97aa629c821579 | f08fe8891c3eeb63b73f9f1f6d97aa629c821579 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 3.10.55 < 3.11 | 3.11 |
| linux | linux_kernel | >= 3.12.29 < 3.13 | 3.13 |
| linux | linux_kernel | >= 3.14.19 < 3.15 | 3.15 |
| linux | linux_kernel | >= 3.16.3 < 3.17 | 3.17 |
| linux | linux_kernel | >= 3.17.1 < 6.6.136 | 6.6.136 |
| linux | linux_kernel | >= 6.13 < 6.18.24 | 6.18.24 |
| linux | linux_kernel | >= 6.19 < 6.19.14 | 6.19.14 |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
vendor_ubuntu8.8HIGH
vendor_redhat5.5MEDIUM
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
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- Cryptographic API;
- Rados block device (RBD) driver;
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- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
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- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
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It was discovered that the Linux kernel did not properly handle shared page
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RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
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handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)
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
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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;
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- GPIO subsystem;
- GPU drivers;
- HID subsystem;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- RISC-V architecture;
- Cryptographic API;
- InfiniBand drivers;
- IOMMU subsystem;
- Network drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- USB over IP driver;
- File systems infrastructure;
- HFS+ file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- IPv6 networking;
- Tracing infrastructure;
- Timer subsystem;
- B.A.T.M.A.N. meshing protocol;
- Bluetooth subsystem;
- Ethernet bridge;
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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
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vendor_ubuntu·2026-07-01
CVE-2026-43226 Linux kernel vulnerabilities
Title: Linux kernel 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;
- 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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CVE-2026-43304 [HIGH] Linux kernel (OEM) vulnerabilities
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
Ubuntu
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vendor_ubuntu·2026-07-01·CVSS 7.1
CVE-2026-43304 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel 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;
- 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
Red Hat
kernel: dcache: Limit the minimal number of bucket to two
vendor_redhat·2026-05-05·CVSS 5.5
CVE-2026-43071 [MEDIUM] CWE-823 kernel: dcache: Limit the minimal number of bucket to two
kernel: dcache: Limit the minimal number of bucket to two
A flaw was found in the Linux kernel's dcache component. When the 'dhash_entries' parameter is set to one, an out-of-bounds (OOB) read occurs in the dentry_hashtable. This issue arises due to an incorrect calculation of the 'd_hash_shift' value, causing the system to attempt to access unallocated memory. A local attacker could exploit this vulnerability to trigger a kernel panic, leading to a denial of service (DoS).
Package: kernel (Red Hat Enterprise Linux 10) - Fix deferred
Package: kernel (Red Hat Enterprise Linux 6) - Out of support scope
Package: kernel (Red Hat Enterprise Linux 7) - Fix deferred
Package: kernel-rt (Red Hat Enterprise Linux 7) - Fix deferred
Package: kernel (Red Hat Enterprise Linux 8) - Fix deferred
Pa
VulDB
Linux Kernel up to 7.0.0 dcache dcache_init out-of-bounds
vuldb·2026-05-05
CVE-2026-43071 [LOW] Linux Kernel up to 7.0.0 dcache dcache_init out-of-bounds
A vulnerability identified as critical has been detected in Linux Kernel up to 6.6.135/6.12.82/6.18.23/6.19.13/7.0.0. This affects the function dcache_init of the component dcache. Performing a manipulation results in out-of-bounds read.
This vulnerability is cataloged as CVE-2026-43071. The attack must originate from the local network. There is no exploit available.
You should upgrade the affected component.
GHSA
GHSA-977x-crv2-w57m: In the Linux kernel, the following vulnerability has been resolved:
dcache: Limit the minimal number of bucket to two
There is an OOB read problem o
ghsa_unreviewed·2026-05-05
CVE-2026-43071 GHSA-977x-crv2-w57m: In the Linux kernel, the following vulnerability has been resolved:
dcache: Limit the minimal number of bucket to two
There is an OOB read problem o
In the Linux kernel, the following vulnerability has been resolved:
dcache: Limit the minimal number of bucket to two
There is an OOB read problem on dentry_hashtable when user sets
'dhash_entries=1':
BUG: unable to handle page fault for address: ffff888b30b774b0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
Oops: Oops: 0000 [#1] SMP PTI
RIP: 0010:__d_lookup+0x56/0x120
Call Trace:
d_lookup.cold+0x16/0x5d
lookup_dcache+0x27/0xf0
lookup_one_qstr_excl+0x2a/0x180
start_dirop+0x55/0xa0
simple_start_creating+0x8d/0xa0
debugfs_start_creating+0x8c/0x180
debugfs_create_dir+0x1d/0x1c0
pinctrl_init+0x6d/0x140
do_one_initcall+0x6d/0x3d0
kernel_init_freeable+0x39f/0x460
kernel_init+0x2a/0x260
There will be only one bucket in dentry_hashtable when dhash_entries
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/277cedabb0ab86baae83fa58218be13c6d3e5526https://git.kernel.org/stable/c/426ef05e82ee52c8d0e95fc0808b7383d8352d73https://git.kernel.org/stable/c/45b06bb5ea96f75ad81d7ef446f832ea6b0026fehttps://git.kernel.org/stable/c/5718df131ab78897a9dd1f2e71c3ba732d4392afhttps://git.kernel.org/stable/c/755b40903eff563768d4d96fd4ef51ec48adde3bhttps://git.kernel.org/stable/c/ddd57ebce245f9c7e2f6902a6c087d6186d2385dhttps://git.kernel.org/stable/c/f08fe8891c3eeb63b73f9f1f6d97aa629c821579
2026-05-05
Published