CVE-2020-12655
published 2020-05-05CVE-2020-12655: An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration…
PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.45%
37.0th percentile
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.6.14-1 (bookworm) | linux 5.6.14-1 (bookworm) |
| linux | linux_kernel | <= 5.6.10 | — |
| linux | linux_kernel | >= 0 < 5.6.14-1 | 5.6.14-1 |
| linux | linux_kernel | >= 0 < 5.6.14-1 | 5.6.14-1 |
| linux | linux_kernel | >= 0 < 5.6.14-1 | 5.6.14-1 |
| linux | linux_kernel | >= 0 < 5.6.14-1 | 5.6.14-1 |
| linux | linux_kernel | >= 0 < 4.15.0-115.116 | 4.15.0-115.116 |
| linux | linux_kernel | >= 0 < 5.4.0-45.49 | 5.4.0-45.49 |
| linux | linux_kernel | >= 0 < 4.4.0-222.255 | 4.4.0-222.255 |
| msrc | cbl_mariner_1.0_arm | — | — |
| msrc | cbl_mariner_1.0_x64 | — | — |
| msrc | cm1_kernel_5.4.91-11_on_cbl_mariner_1.0 | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv2.02.1LOWAV:L/AC:L/Au:N/C:N/I:N/A:P
osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_debian5.5MEDIUM
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
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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·2020-09-03·CVSS 5.5
CVE-2019-20810 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Chuhong Yuan discovered that go7007 USB audio device driver in the Linux
kernel did not properly deallocate memory in some failure conditions. A
physically proximate attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2019-20810)
Fan Yang discovered that the mremap implementation in the Linux kernel did
not properly handle DAX Huge Pages. A local attacker with access to DAX
storage could use this to gain administrative privileges. (CVE-2020-10757)
It was discovered that the Linux kernel did not correctly apply Speculative
Store Bypass Disable (SSBD) mitigations in certain situations. A local
attacker could possibly use this to expose sensitive information.
(CV
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2020-09-03·CVSS 7.8
CVE-2018-20669 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Timothy Michaud discovered that the i915 graphics driver in the Linux
kernel did not properly validate user memory locations for the
i915_gem_execbuffer2_ioctl. A local attacker could possibly use this to
cause a denial of service or execute arbitrary code. (CVE-2018-20669)
It was discovered that the Kvaser CAN/USB driver in the Linux kernel did
not properly initialize memory in certain situations. A local attacker
could possibly use this to expose sensitive information (kernel memory).
(CVE-2019-19947)
Chuhong Yuan discovered that go7007 USB audio device driver in the Linux
kernel did not properly deallocate memory in some failure conditions. A
physically proximate attacker could use t
Ubuntu
linux kernel vulnerabilities
vendor_ubuntu·2020-08-23·CVSS 5.5
CVE-2020-12655 [MEDIUM] linux kernel vulnerabilities
Title: linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the XFS file system implementation in the Linux
kernel did not properly validate meta data in some circumstances. An
attacker could use this to construct a malicious XFS image that, when
mounted, could cause a denial of service. (CVE-2020-12655)
It was discovered that the bcache subsystem in the Linux kernel did not
properly release a lock in some error conditions. A local attacker could
possibly use this to cause a denial of service. (CVE-2020-12771)
Kyungtae Kim discovered that the USB testing driver in the Linux kernel did
not properly deallocate memory on disconnect events. A physically proximate
attacker could use this to cause a denial of service (memory exh
Microsoft
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata
vendor_msrc·2020-05-12·CVSS 5.5
CVE-2020-12655 [MEDIUM] CWE-835 An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata aka CID-d0c7feaf8767.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identifie
Red Hat
kernel: sync of excessive duration via an XFS v5 image with crafted metadata
vendor_redhat·2020-03-02·CVSS 5.5
CVE-2020-12655 [MEDIUM] CWE-20 kernel: sync of excessive duration via an XFS v5 image with crafted metadata
kernel: sync of excessive duration via an XFS v5 image with crafted metadata
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.
A flaw was discovered in the XFS source in the Linux kernel. This flaw allows an attacker with the ability to mount an XFS filesystem, to trigger a denial of service while attempting to sync a file located on an XFS v5 image with crafted metadata.
Statement: This issue is rated as having Low impact because of the preconditions needed to trigger it (administrative account or physical access).
Mitigation: This flaw requires an attacker being able to have the system mount a crafted filesystem.
Debian
CVE-2020-12655: linux - An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Li...
vendor_debian·2020·CVSS 5.5
CVE-2020-12655 [MEDIUM] CVE-2020-12655: linux - An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Li...
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.
Scope: local
bookworm: resolved (fixed in 5.6.14-1)
bullseye: resolved (fixed in 5.6.14-1)
forky: resolved (fixed in 5.6.14-1)
sid: resolved (fixed in 5.6.14-1)
trixie: resolved (fixed in 5.6.14-1)
GHSA
GHSA-6694-j64w-gpfc: An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc
ghsa_unreviewed·2022-05-24
CVE-2020-12655 [LOW] CWE-400 GHSA-6694-j64w-gpfc: An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.
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-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
osv·2020-09-03·CVSS 7.8
CVE-2018-20669 [HIGH] linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
Timothy Michaud discovered that the i915 graphics driver in the Linux
kernel did not properly validate user memory locations for the
i915_gem_execbuffer2_ioctl. A local attacker could possibly use this to
cause a denial of service or execute arbitrary code. (CVE-2018-20669)
It was discovered that the Kvaser CAN/USB driver in the Linux kernel did
not properly initialize memory in certain situations. A local attacker
could possibly use this to expose sensitive information (kernel memory).
(CVE-2019-19947)
Chuhong Yuan discovered that go7007 USB audio device driver in the Linux
kernel did not
OSV
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
osv·2020-09-03·CVSS 5.5
CVE-2019-20810 [MEDIUM] linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
Chuhong Yuan discovered that go7007 USB audio device driver in the Linux
kernel did not properly deallocate memory in some failure conditions. A
physically proximate attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2019-20810)
Fan Yang discovered that the mremap implementation in the Linux kernel did
not properly handle DAX Huge Pages. A local attacker with access to DAX
storage could use this to gain administrative privileges. (CVE-2020-10757)
It was discovered that the Linux kernel did not correctly apply Speculative
Store Bypass Disable (SSBD) mitigations in certain
OSV
linux-hwe, linux-aws-5.3, linux-azure-5.3, linux-gke-5.3 vulnerabilities
osv·2020-08-23·CVSS 5.5
CVE-2020-12655 [MEDIUM] linux-hwe, linux-aws-5.3, linux-azure-5.3, linux-gke-5.3 vulnerabilities
linux-hwe, linux-aws-5.3, linux-azure-5.3, linux-gke-5.3 vulnerabilities
It was discovered that the XFS file system implementation in the Linux
kernel did not properly validate meta data in some circumstances. An
attacker could use this to construct a malicious XFS image that, when
mounted, could cause a denial of service. (CVE-2020-12655)
It was discovered that the bcache subsystem in the Linux kernel did not
properly release a lock in some error conditions. A local attacker could
possibly use this to cause a denial of service. (CVE-2020-12771)
Kyungtae Kim discovered that the USB testing driver in the Linux kernel did
not properly deallocate memory on disconnect events. A physically proximate
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2020-15393)
OSV
CVE-2020-12655: An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc
osv·2020-05-05·CVSS 5.5
CVE-2020-12655 [MEDIUM] CVE-2020-12655: An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-12655 kernel: sync of excessive duration via an XFS v5 image with crafted metadata
bugzilla·2020-05-06·CVSS 5.5
CVE-2020-12655 [MEDIUM] CVE-2020-12655 kernel: sync of excessive duration via an XFS v5 image with crafted metadata
CVE-2020-12655 kernel: sync of excessive duration via an XFS v5 image with crafted metadata
An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel. An attacker who is able to mount a xfs filesystem can trigger a denial of service while attempting to sync a file located an XFS v5 image with crafted metadata.
Reference and upstream commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0c7feaf87678371c2c09b3709400be416b2dc62
https://lore.kernel.org/linux-xfs/20200221153803.GP9506@magnolia/
Discussion:
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1832545]
---
Mitigation:
This flaw requires an attacker being able to have the system mount a crafted filesystem.
If the xfs filesystem is not in use,
Bugzilla
CVE-2020-12655 kernel: sync of excessive duration via an XFS v5 image with crafted metadata [fedora-all]
bugzilla·2020-05-06·CVSS 5.5
CVE-2020-12655 [MEDIUM] CVE-2020-12655 kernel: sync of excessive duration via an XFS v5 image with crafted metadata [fedora-all]
CVE-2020-12655 kernel: sync of excessive duration via an XFS v5 image with crafted metadata [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
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.htmlhttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0c7feaf87678371c2c09b3709400be416b2dc62https://github.com/torvalds/linux/commit/d0c7feaf87678371c2c09b3709400be416b2dc62https://lists.debian.org/debian-lts-announce/2020/08/msg00019.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ES5C6ZCMALBEBMKNNCTBSLLSYGFZG3FF/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IO5XIQSRI747P4RVVTNX7TUPEOCF4OPU/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZ2X3TM6RGRUS3KZAS26IJO5XGU7TBBR/https://lore.kernel.org/linux-xfs/20200221153803.GP9506%40magnolia/https://security.netapp.com/advisory/ntap-20200608-0001/https://usn.ubuntu.com/4465-1/https://usn.ubuntu.com/4483-1/https://usn.ubuntu.com/4485-1/http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.htmlhttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0c7feaf87678371c2c09b3709400be416b2dc62https://github.com/torvalds/linux/commit/d0c7feaf87678371c2c09b3709400be416b2dc62https://lists.debian.org/debian-lts-announce/2020/08/msg00019.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlhttps://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ES5C6ZCMALBEBMKNNCTBSLLSYGFZG3FF/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IO5XIQSRI747P4RVVTNX7TUPEOCF4OPU/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZ2X3TM6RGRUS3KZAS26IJO5XGU7TBBR/https://lore.kernel.org/linux-xfs/20200221153803.GP9506%40magnolia/https://security.netapp.com/advisory/ntap-20200608-0001/https://usn.ubuntu.com/4465-1/https://usn.ubuntu.com/4483-1/https://usn.ubuntu.com/4485-1/
2020-05-05
Published