CVE-2020-25671
published 2021-05-26CVE-2020-25671: A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.
PriorityP340high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.51%
40.7th percentile
A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.
Affected
19 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 5.10.38-1 (bookworm) | linux 5.10.38-1 (bookworm) |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.4.0-74.83 | 5.4.0-74.83 |
| linux | linux_kernel | >= 0 < 4.4.0-222.255 | 4.4.0-222.255 |
| linux | linux_kernel | >= 3.6 < 4.4.267 | 4.4.267 |
| linux | linux_kernel | >= 4.10 < 4.14.231 | 4.14.231 |
| linux | linux_kernel | >= 4.15 < 4.19.187 | 4.19.187 |
| linux | linux_kernel | >= 4.20 < 5.4.112 | 5.4.112 |
| linux | linux_kernel | >= 4.5 < 4.9.267 | 4.9.267 |
| linux | linux_kernel | >= 5.11 < 5.11.14 | 5.11.14 |
| linux | linux_kernel | >= 5.5 < 5.10.30 | 5.10.30 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.2HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
vendor_ubuntu7.8HIGH
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Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2022-03-22·CVSS 7.8
CVE-2020-25673 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. (CVE-2022-0492)
It was discovered that the aufs file system in the Linux kernel did not
properly restrict mount namespaces, when mounted with the non-default
allow_userns option set. A local attacker could use this to gain
administrative privileges. (CVE-2016-2853)
It was discovered that the aufs file system in the Linux kernel did not
properly maintain POSIX ACL xattr data, when mounted with the non-default
allow_userns option. A local attacker could possibly us
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2021-06-23·CVSS 3.5
CVE-2021-31440 [LOW] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code. (CVE-2021-3609)
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly enforce limits for pointer operations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-33200)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did
not properly clear received fragments from memory in some situations. A
physically proximate attacker could possibly use this issu
Ubuntu
Linux kernel (OEM) vulnerabilities
vendor_ubuntu·2021-05-11·CVSS 7.8
CVE-2021-3489 [HIGH] Linux kernel (OEM) vulnerabilities
Title: Linux kernel (OEM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Ryota Shiga discovered that the eBPF implementation in the Linux kernel did
not properly verify that a BPF program only reserved as much memory for a
ring buffer as was allocated. A local attacker could use this to cause a
denial of service (system crash) or execute arbitrary code. (CVE-2021-3489)
Manfred Paul discovered that the eBPF implementation in the Linux kernel
did not properly track bounds on bitwise operations. A local attacker could
use this to cause a denial of service (system crash) or execute arbitrary
code. (CVE-2021-3490)
Billy Jheng Bing-Jhong discovered that the io_uring implementation of the
Linux kernel did not properly enforce the MAX_RW_COUNT limit in some
si
Red Hat
kernel: refcount leak in llcp_sock_connect()
vendor_redhat·2020-11-01·CVSS 7.8
CVE-2020-25671 [HIGH] CWE-416 kernel: refcount leak in llcp_sock_connect()
kernel: refcount leak in llcp_sock_connect()
A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.
A use-after-free flaw was found in the Linux kernel’s NFC LLCP protocol implementation in the way the user triggers the llcp_sock_connect() function. This flaw allows a local user to crash the system.
Package: kernel (Red Hat Enterprise Linux 5) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-alt (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: kernel-rt (Red
Debian
CVE-2020-25671: linux - A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_co...
vendor_debian·2020·CVSS 7.8
CVE-2020-25671 [HIGH] CVE-2020-25671: linux - A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_co...
A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.
Scope: local
bookworm: resolved (fixed in 5.10.38-1)
bullseye: resolved (fixed in 5.10.38-1)
forky: resolved (fixed in 5.10.38-1)
sid: resolved (fixed in 5.10.38-1)
trixie: resolved (fixed in 5.10.38-1)
GHSA
GHSA-857m-9c4p-fvf4: A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalatio
ghsa_unreviewed·2022-05-24
CVE-2020-25671 [HIGH] CWE-416 GHSA-857m-9c4p-fvf4: A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalatio
A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.
OSV
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
osv·2022-03-22·CVSS 7.8
CVE-2022-0492 [HIGH] linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. (CVE-2022-0492)
It was discovered that the aufs file system in the Linux kernel did not
properly restrict mount namespaces, when mounted with the non-default
allow_userns option set. A local attacker could use this to gain
administrative privileges. (CVE-2016-2853)
It was discovered that the aufs file system in the Linux kernel did not
properly maintain POSIX ACL xattr data, when mounted with the non-default
allow_userns option. A local attacker could possibly use this to gain
elevated privileges. (CVE
OSV
linux, linux-aws, linux-aws-5.8, linux-azure, linux-azure-5.8, linux-gcp, linux-gcp-5.8, linux-hwe-5.8, linux-kvm, linux-oracle, linux-oracle-5.8, linux-raspi vulnerabilities
osv·2021-06-23·CVSS 3.5
CVE-2021-3609 [LOW] linux, linux-aws, linux-aws-5.8, linux-azure, linux-azure-5.8, linux-gcp, linux-gcp-5.8, linux-hwe-5.8, linux-kvm, linux-oracle, linux-oracle-5.8, linux-raspi vulnerabilities
linux, linux-aws, linux-aws-5.8, linux-azure, linux-azure-5.8, linux-gcp, linux-gcp-5.8, linux-hwe-5.8, linux-kvm, linux-oracle, linux-oracle-5.8, linux-raspi vulnerabilities
Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code. (CVE-2021-3609)
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly enforce limits for pointer operations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-33200)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did
not properly clear received fragments from memory in some
OSV
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.
osv·2021-06-08·CVSS 7.8
CVE-2020-25670 [HIGH] linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel contained a reference counting error. A local attacker could
use this to cause a denial of service (system crash). (CVE-2020-25670)
Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly deallocate memory in certain error
situations. A local attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2020-25671, CVE-2020-25672)
Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the
OSV
CVE-2020-25671: A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalatio
osv·2021-05-26·CVSS 7.8
CVE-2020-25671 [HIGH] CVE-2020-25671: A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalatio
A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.
OSV
linux-oem-5.10 vulnerabilities
osv·2021-05-11·CVSS 7.8
CVE-2021-3489 [HIGH] linux-oem-5.10 vulnerabilities
linux-oem-5.10 vulnerabilities
Ryota Shiga discovered that the eBPF implementation in the Linux kernel did
not properly verify that a BPF program only reserved as much memory for a
ring buffer as was allocated. A local attacker could use this to cause a
denial of service (system crash) or execute arbitrary code. (CVE-2021-3489)
Manfred Paul discovered that the eBPF implementation in the Linux kernel
did not properly track bounds on bitwise operations. A local attacker could
use this to cause a denial of service (system crash) or execute arbitrary
code. (CVE-2021-3490)
Billy Jheng Bing-Jhong discovered that the io_uring implementation of the
Linux kernel did not properly enforce the MAX_RW_COUNT limit in some
situations. A local attacker could use this to cause a denial of service
(syste
Kernel
nfc: fix refcount leak in llcp_sock_connect()
kernel_security·2021-03-25·CVSS 7.8
CVE-2020-25671 [HIGH] nfc: fix refcount leak in llcp_sock_connect()
nfc: fix refcount leak in llcp_sock_connect()
nfc_llcp_local_get() is invoked in llcp_sock_connect(),
but nfc_llcp_local_put() is not invoked in subsequent failure branches.
As a result, refcount leakage occurs.
To fix it, add calling nfc_llcp_local_put().
fix CVE-2020-25671
Fixes: c7aa12252f51 ("NFC: Take a reference on the LLCP local pointer when creating a socket")
Reported-by: "kiyin(尹亮)"
Link: https://www.openwall.com/lists/oss-security/2020/11/01/1
Cc: #v3.6
Signed-off-by: Xiaoming Ni
Signed-off-by: David S. Miller
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-25671 kernel: refcount leak in llcp_sock_connect() [fedora-all]
bugzilla·2020-11-04·CVSS 7.8
CVE-2020-25671 [HIGH] CVE-2020-25671 kernel: refcount leak in llcp_sock_connect() [fedora-all]
CVE-2020-25671 kernel: refcount leak in llcp_sock_connect() [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported versions of F
Bugzilla
CVE-2020-25671 kernel: refcount leak in llcp_sock_connect()
bugzilla·2020-11-04·CVSS 7.8
CVE-2020-25671 [HIGH] CVE-2020-25671 kernel: refcount leak in llcp_sock_connect()
CVE-2020-25671 kernel: refcount leak in llcp_sock_connect()
A vulnerability was found in Linux Kernel, where a refcount leak in llcp_sock_connect() causing use-after-free which might lead to privilege escalations.
References:
https://www.openwall.com/lists/oss-security/2020/11/01/1
Discussion:
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1894553]
http://www.openwall.com/lists/oss-security/2020/11/01/1https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlhttps://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PW3OASG7OEMHANDWBM5US5WKTOC76KMH/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTVACC6PGS6OSD3EYY7FZUAZT2EUMFH5/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEIEGQXUW37YHZ5MTAZTDCIMHUN26NJS/https://security.netapp.com/advisory/ntap-20210702-0008/https://www.openwall.com/lists/oss-security/2020/11/01/1http://www.openwall.com/lists/oss-security/2020/11/01/1https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlhttps://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PW3OASG7OEMHANDWBM5US5WKTOC76KMH/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTVACC6PGS6OSD3EYY7FZUAZT2EUMFH5/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEIEGQXUW37YHZ5MTAZTDCIMHUN26NJS/https://security.netapp.com/advisory/ntap-20210702-0008/https://www.openwall.com/lists/oss-security/2020/11/01/1
2021-05-26
Published