CVE-2021-47343
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47343
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47343.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47343
- Related
- Published
- 2024-05-21T15:15:20Z
- Modified
- 2024-09-18T03:17:25.782773Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
dm btree remove: assign new_root only when removal succeeds
removeraw() in dmbtreeremove() may fail due to IO read error (e.g. read the content of origin block fails during shadowing), and the value of shadowspine::root is uninitialized, but the uninitialized value is still assign to newroot in the end of dmbtree_remove().
For dm-thin, the value of pmd->detailsroot or pmd->root will become an uninitialized value, so if trying to read detailsinfo tree again out-of-bound memory may occur as showed below:
general protection fault, probably for non-canonical address 0x3fdcb14c8d7520 CPU: 4 PID: 515 Comm: dmsetup Not tainted 5.13.0-rc6 Hardware name: QEMU Standard PC RIP: 0010:metadatallloadie+0x14/0x30 Call Trace: smmetadatacountismorethanone+0xb9/0xe0 dmtmshadowblock+0x52/0x1c0 shadowstep+0x59/0xf0 removeraw+0xb2/0x170 dmbtreeremove+0xf4/0x1c0 dmpooldeletethindevice+0xc3/0x140 poolmessage+0x218/0x2b0 targetmessage+0x251/0x290 ctlioctl+0x1c4/0x4d0 dmctlioctl+0xe/0x20 _x64sysioctl+0x7b/0xb0 dosyscall64+0x40/0xb0 entrySYSCALL64afterhwframe+0x44/0xae
Fixing it by only assign new_root when removal succeeds
- References
-
- https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc
- https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3
- https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9
- https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5
- https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851
- https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a
- https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb
- https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e
- https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5
- https://security-tracker.debian.org/tracker/CVE-2021-47343
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source