CVE-2026-31533
published 2026-04-23CVE-2026-31533: In the Linux kernel, the following vulnerability has been resolved: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption The -EBUSY handling…
PriorityP342critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.39%
31.6th percentile
In the Linux kernel, the following vulnerability has been resolved:
net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
The -EBUSY handling in tls_do_encryption(), introduced by commit
859054147318 ("net: tls: handle backlogging of crypto requests"), has
a use-after-free due to double cleanup of encrypt_pending and the
scatterlist entry.
When crypto_aead_encrypt() returns -EBUSY, the request is enqueued to
the cryptd backlog and the async callback tls_encrypt_done() will be
invoked upon completion. That callback unconditionally restores the
scatterlist entry (sge->offset, sge->length) and decrements
ctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an
error, the synchronous error path in tls_do_encryption() performs the
same cleanup again, double-decrementing encrypt_pending and
double-restoring the scatterlist.
The double-decrement corrupts the encrypt_pending sentinel (initialized
to 1), making tls_encrypt_async_wait() permanently skip the wait for
pending async callbacks. A subsequent sendmsg can then free the
tls_rec via bpf_exec_tx_verdict() while a cryptd callback is still
pending, resulting in a use-after-free when the callback fires on the
freed record.
Fix this by skipping the synchronous cleanup when the -EBUSY async
wait returns an error, since the callback has already handled
encrypt_pending and sge restoration.
Affected
84 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 13eca403876bbea3716e82cdfe6f1e6febb38754 < 0e43e0a3c94044acc74b8e0927c27972eb5a59e8 | 0e43e0a3c94044acc74b8e0927c27972eb5a59e8 |
| linux | linux | >= 3ade391adc584f17b5570fd205de3ad029090368 < 414fc5e5a5aff776c150f1b86770e0a25a35df3a | 414fc5e5a5aff776c150f1b86770e0a25a35df3a |
| linux | linux | >= 5.15.160 < 5.15.203 | 5.15.203 |
| linux | linux | >= 6.1.84 < 6.1.169 | 6.1.169 |
| linux | linux | >= 6.6.18 < 6.6.135 | 6.6.135 |
| linux | linux | >= 6.7.6 < 6.8 | 6.8 |
| linux | linux | >= 8590541473188741055d27b955db0777569438e3 < aa9facde6c5005205874c37db3fd25799d741baf | aa9facde6c5005205874c37db3fd25799d741baf |
| linux | linux | >= 8590541473188741055d27b955db0777569438e3 < 5d70eb25b41e9b010828cd12818b06a0c3b04412 | 5d70eb25b41e9b010828cd12818b06a0c3b04412 |
| linux | linux | >= 8590541473188741055d27b955db0777569438e3 < 2694d408b0e595024e0fc1d64ff9db0358580f74 | 2694d408b0e595024e0fc1d64ff9db0358580f74 |
| linux | linux | >= 8590541473188741055d27b955db0777569438e3 < a9b8b18364fffce4c451e6f6fd218fa4ab646705 | a9b8b18364fffce4c451e6f6fd218fa4ab646705 |
| linux | linux | >= cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 < 02f3ecadb23558bbe068e6504118f1b712d4ece0 | 02f3ecadb23558bbe068e6504118f1b712d4ece0 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.15.160 < 5.15.203 | 5.15.203 |
| linux | linux_kernel | >= 6.1.84 < 6.1.169 | 6.1.169 |
| linux | linux_kernel | >= 6.13 < 6.18.23 | 6.18.23 |
| linux | linux_kernel | >= 6.19 < 6.19.13 | 6.19.13 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu7.8HIGH
vendor_redhat7.0MEDIUM
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Summary: Several security issues were fixed in the Linux kernel.
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A local attacker could use this to escalate privileges, or possibly escape
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
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An attacker could possibly use these to compromise the system.
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- Cryptographic API;
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A local attacker could use this to escalate privileges, or possibly escape
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Cryptographic API;
- Ethernet bonding driver;
- Packet sockets;
- TLS protocol;
(CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033,
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It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- Cryptographic API;
- Packet sockets;
- TLS protocol;
(CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077,
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ATTE
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A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)
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An attacker could possibly use these to compromise the system.
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- ARM64 architecture;
- x86 architecture;
- Cryptographic API;
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- S390 architecture;
- Cryptographic API;
- GPU drivers;
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CVE-2026-23168 [HIGH] Linux kernel (NVIDIA) vulnerabilities
Title: Linux kernel (NVIDIA) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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;
- Cryptographic API;
- Compute Acceleration Framework;
- Drivers core;
- Null block device driver;
- Ublk userspace block driver;
- Bluetooth drivers;
- Counter interface drivers;
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)
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:
- Cryptographic API;
- Ethernet bonding driver;
- Packet sockets;
- TLS protocol;
(CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033,
CVE-2026-43077, CVE-2026-43078)
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It was discovered that the Linux kernel algif_aead module did not properly
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A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)
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:
- Cryptographic API;
- Ethernet bonding driver;
- SMB network file system;
- Netfilter;
- io_uring subsystem;
- Packet sockets;
- TLS protocol;
(CVE-2024-35862, CVE-2024-50060, CVE-2026-23274, CVE-2026-23351,
CVE-2026-31419, CVE-2026-31504, C
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vendor_ubuntu·2026-05-22·CVSS 7.8
CVE-2026-31504 [HIGH] Linux kernel (Azure)vulnerabilities
Title: Linux kernel (Azure)vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- Cryptographic API;
- Packet sockets;
- TLS protocol;
(CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077,
CVE-2026-43078)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATT
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CVE-2026-23274 [MEDIUM] Linux kernel (Oracle) vulnerabilities
Title: Linux kernel (Oracle) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- S390 architecture;
- Cryptographic API;
- GPU drivers;
- Ethernet bonding driver;
- Network file system (NFS) server daemon;
- Distributed Switch Architecture;
- Netfilter;
- Control group (cgroup);
- Kernel kexec() syscall;
- Memory management;
- MA
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vendor_ubuntu·2026-05-22·CVSS 7.8
CVE-2026-23274 [HIGH] Linux kernel (GCP) vulnerabilities
Title: Linux kernel (GCP) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- Cryptographic API;
- Ethernet bonding driver;
- SMB network file system;
- Netfilter;
- io_uring subsystem;
- Packet sockets;
- TLS protocol;
(CVE-2024-35862, CVE-2024-50060, CVE-2026-23274, CVE-2026-23351,
CVE-2026-31419, CVE-2026-31504, CVE-2026-31533
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Linux kernel (NVIDIA) vulnerabilities
vendor_ubuntu·2026-05-20·CVSS 7.8
CVE-2025-71268 [HIGH] Linux kernel (NVIDIA) vulnerabilities
Title: Linux kernel (NVIDIA) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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;
- Cryptographic API;
- Compute Acceleration Framework;
- Drivers core;
- Null block device driver;
- Ublk userspace block driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL
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vendor_ubuntu·2026-05-19·CVSS 7.8
CVE-2026-31533 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- Cryptographic API;
- Packet sockets;
- TLS protocol;
(CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077,
CVE-2026-43078)
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION:
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-05-19·CVSS 7.8
CVE-2026-43077 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- Cryptographic API;
- Ethernet bonding driver;
- SMB network file system;
- Netfilter;
- io_uring subsystem;
- Packet sockets;
- TLS protocol;
(CVE-2024-35862, CVE-2024-50060, CVE-2026-23274, CVE-2026-23351,
CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-05-19·CVSS 7.8
CVE-2025-71268 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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;
- Cryptographic API;
- Compute Acceleration Framework;
- Drivers core;
- Null block device driver;
- Ublk userspace block driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL subsyste
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-05-19·CVSS 5.5
CVE-2026-43078 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
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)
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:
- S390 architecture;
- Cryptographic API;
- GPU drivers;
- Ethernet bonding driver;
- Network file system (NFS) server daemon;
- Distributed Switch Architecture;
- Netfilter;
- Control group (cgroup);
- Kernel kexec() syscall;
- Memory management;
- MAC80211 su
Red Hat
kernel: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
vendor_redhat·2026-04-23·CVSS 7.0
CVE-2026-31533 [MEDIUM] CWE-763 kernel: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
kernel: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
A flaw was found in the Linux kernel's `net/tls` component. Incorrect error handling in the `tls_do_encryption()` function, specifically when a cryptographic request returns an error, leads to a double cleanup of internal data structures. This can result in a use-after-free vulnerability, where memory is accessed after it has been deallocated. An attacker could potentially leverage this flaw to cause a denial of service or achieve arbitrary code execution.
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
GHSA
GHSA-r7wv-m72q-8qj8: In the Linux kernel, the following vulnerability has been resolved:
net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
The -EBUSY
ghsa_unreviewed·2026-04-23
CVE-2026-31533 GHSA-r7wv-m72q-8qj8: In the Linux kernel, the following vulnerability has been resolved:
net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
The -EBUSY
In the Linux kernel, the following vulnerability has been resolved:
net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
The -EBUSY handling in tls_do_encryption(), introduced by commit
859054147318 ("net: tls: handle backlogging of crypto requests"), has
a use-after-free due to double cleanup of encrypt_pending and the
scatterlist entry.
When crypto_aead_encrypt() returns -EBUSY, the request is enqueued to
the cryptd backlog and the async callback tls_encrypt_done() will be
invoked upon completion. That callback unconditionally restores the
scatterlist entry (sge->offset, sge->length) and decrements
ctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an
error, the synchronous error path in tls_do_encryption() performs the
same cleanup again, double-decre
VulDB
Linux Kernel up to 6.19.12 tls tls_do_encryption use after free
vuldb·2026-04-23
CVE-2026-31533 [CRITICAL] Linux Kernel up to 6.19.12 tls tls_do_encryption use after free
A vulnerability was found in Linux Kernel up to 6.19.12. It has been classified as critical. Affected by this vulnerability is the function tls_do_encryption of the component tls. This manipulation causes use after free.
This vulnerability is handled as CVE-2026-31533. The attack can only be done within the local network. There is not any exploit available.
Upgrading the affected component is recommended.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/02f3ecadb23558bbe068e6504118f1b712d4ece0https://git.kernel.org/stable/c/0e43e0a3c94044acc74b8e0927c27972eb5a59e8https://git.kernel.org/stable/c/2694d408b0e595024e0fc1d64ff9db0358580f74https://git.kernel.org/stable/c/414fc5e5a5aff776c150f1b86770e0a25a35df3ahttps://git.kernel.org/stable/c/5d70eb25b41e9b010828cd12818b06a0c3b04412https://git.kernel.org/stable/c/a9b8b18364fffce4c451e6f6fd218fa4ab646705https://git.kernel.org/stable/c/aa9facde6c5005205874c37db3fd25799d741bafhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
2026-04-23
Published