CVE-2021-47114 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b
https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65
https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57
https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e
https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae
https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc
https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774
https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770
https://lore.kernel.org/linux-cve-announce/2024031507-CVE-2021-47114-6af8@gregkh/T/#u
https://nvd.nist.gov/vuln/detail/CVE-2021-47114
https://www.cve.org/CVERecord?id=CVE-2021-47114

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
Weaknesses		NVD-CWE-noinfo
CPEs		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:5.13:rc1:::::: cpe:2.3:o:linux:linux_kernel:5.13:rc2:::::: cpe:2.3:o:linux:linux_kernel:5.13:rc3:::::: cpe:2.3:o:linux:linux_kernel:5.13:rc4::::::
Vendors & Products		Linux Linux linux Kernel

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Show plain JSON

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Show plain JSON

{"bugzilla": {"description": "kernel: ocfs2: fix data corruption by fallocate", "id": "2269865", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2269865"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nocfs2: fix data corruption by fallocate\nWhen fallocate punches holes out of inode size, if original isize is in\nthe middle of last cluster, then the part from isize to the end of the\ncluster will be zeroed with buffer write, at that time isize is not yet\nupdated to match the new size, if writeback is kicked in, it will invoke\nocfs2_writepage()->block_write_full_page() where the pages out of inode\nsize will be dropped.  That will cause file corruption.  Fix this by\nzero out eof blocks when extending the inode size.\nRunning the following command with qemu-image 4.2.1 can get a corrupted\ncoverted image file easily.\nqemu-img convert -p -t none -T none -f qcow2 $qcow_image \\\n-O qcow2 -o compat=1.1 $qcow_image.conv\nThe usage of fallocate in qemu is like this, it first punches holes out\nof inode size, then extend the inode size.\nfallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0\nfallocate(11, 0, 2276196352, 65536) = 0\nv1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html\nv2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/"], "name": "CVE-2021-47114", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47114\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47114\nhttps://lore.kernel.org/linux-cve-announce/2024031507-CVE-2021-47114-6af8@gregkh/T/#u"], "threat_severity": "Low"}

{

bugzilla : { »

description : kernel: ocfs2: fix data corruption by fallocate (string)

id : 2269865 (string)

url : https://bugzilla.redhat.com/show_bug.cgi?id=2269865 (string)

}

csaw : false (boolean)

cvss3 : { »

cvss3_base_score : 5.5 (string)

cvss3_scoring_vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (string)

status : draft (string)

}

cwe : CWE-20 (string)

details : [ »

0 : In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix data corruption by fallocate When fallocate punches holes out of inode size, if original isize is in the middle of last cluster, then the part from isize to the end of the cluster will be zeroed with buffer write, at that time isize is not yet updated to match the new size, if writeback is kicked in, it will invoke ocfs2_writepage()->block_write_full_page() where the pages out of inode size will be dropped. That will cause file corruption. Fix this by zero out eof blocks when extending the inode size. Running the following command with qemu-image 4.2.1 can get a corrupted coverted image file easily. qemu-img convert -p -t none -T none -f qcow2 $qcow_image \ -O qcow2 -o compat=1.1 $qcow_image.conv The usage of fallocate in qemu is like this, it first punches holes out of inode size, then extend the inode size. fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0 fallocate(11, 0, 2276196352, 65536) = 0 v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html v2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/ (string)

]

name : CVE-2021-47114 (string)

package_state : [ »

0 : { »

cpe : cpe:/o:redhat:enterprise_linux:6 (string)

fix_state : Out of support scope (string)

package_name : kernel (string)

product_name : Red Hat Enterprise Linux 6 (string)

}

1 : { »

cpe : cpe:/o:redhat:enterprise_linux:7 (string)

fix_state : Out of support scope (string)

package_name : kernel (string)

product_name : Red Hat Enterprise Linux 7 (string)

}

2 : { »

cpe : cpe:/o:redhat:enterprise_linux:7 (string)

fix_state : Out of support scope (string)

package_name : kernel-rt (string)

product_name : Red Hat Enterprise Linux 7 (string)

}

3 : { »

cpe : cpe:/o:redhat:enterprise_linux:8 (string)

fix_state : Not affected (string)

package_name : kernel (string)

product_name : Red Hat Enterprise Linux 8 (string)

}

4 : { »

cpe : cpe:/o:redhat:enterprise_linux:8 (string)

fix_state : Not affected (string)

package_name : kernel-rt (string)

product_name : Red Hat Enterprise Linux 8 (string)

}

5 : { »

cpe : cpe:/o:redhat:enterprise_linux:9 (string)

fix_state : Not affected (string)

package_name : kernel (string)

product_name : Red Hat Enterprise Linux 9 (string)

}

6 : { »

cpe : cpe:/o:redhat:enterprise_linux:9 (string)

fix_state : Not affected (string)

package_name : kernel-rt (string)

product_name : Red Hat Enterprise Linux 9 (string)

}

]

public_date : 2024-03-15T00:00:00Z (string)

references : [ »

0 : https://www.cve.org/CVERecord?id=CVE-2021-47114 https://nvd.nist.gov/vuln/detail/CVE-2021-47114 https://lore.kernel.org/linux-cve-announce/2024031507-CVE-2021-47114-6af8@gregkh/T/#u (string)

]

threat_severity : Low (string)

}

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

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