CVE-2022-50428None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: ext4: fix off-by-one errors in fast-commit block filling Due to several different off-by-one errors, or perhaps due to a late change in design that wasn't fully reflec…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix off-by-one errors in fast-commit block filling
Due to several different off-by-one errors, or perhaps due to a late change in design that wasn't fully reflected in the code that was actually merged, there are several very strange constraints on how fast-commit blocks are filled with tlv entries:
tlvs must start at least 10 bytes before the end of the block, even though the minimum tlv length is 8. Otherwise, the replay code will ignore them. (BUG: ext4_fc_reserve_space() could violate this requirement if called with a len of blocksize - 9 or blocksize - 8. Fortunately, this doesn't seem to happen currently.)
tlvs must end at least 1 byte before the end of the block. Otherwise the replay code will consider them to be invalid. This quirk contributed to a bug (fixed by an earlier commit) where uninitialized memory was being leaked to disk in the last byte of blocks.
Also, strangely these constraints don't apply to the replay code in e2fsprogs, which will accept any tlvs in the blocks (with no bounds checks at all, but that is a separate issue...).
Given that this all seems to be a bug, let's fix it by just filling blocks with tlv entries in the natural way.
Note that old kernels will be unable to replay fast-commit journals created by kernels that have this commit.
Linux >= aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e < 18f28f13301d1afb8cea9c4ddcecdbff14488ec6Linux >= aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e < 5ca65dffdead16572ca046c43fb576b227f7f635Linux >= aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e < 5439ad45c0d0c8db41eb6f4dce6f778f15a5ee16Linux >= aa75f4d3daaeb1389b9cce9d6b84401eaf228d4e < 48a6a66db82b8043d298a630f22c62d43550cae5Linux 5.10Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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