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CVE-2022-50306 (GCVE-0-2022-50306)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:46 – Updated: 2026-08-05 08:58
VLAI
Title
ext4: fix potential out of bound read in ext4_fc_replay_scan()
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix potential out of bound read in ext4_fc_replay_scan() For scan loop must ensure that at least EXT4_FC_TAG_BASE_LEN space. If remain space less than EXT4_FC_TAG_BASE_LEN which will lead to out of bound read when mounting corrupt file system image. ADD_RANGE/HEAD/TAIL is needed to add extra check when do journal scan, as this three tags will read data during scan, tag length couldn't less than data length which will read.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 6969367c1500c15eddc38fda12f6d15518ad6d03 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < f234294812c9b68d603650d28743eafb718e7ad5 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 1b45cc5c7b920fd8bf72e5a888ec7abeadf41e09 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.15.87 , ≤ 5.15.* (semver)
Unaffected: 6.0.6 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
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              "value": "AV:L - Triggered only when mounting a crafted ext4 image with a dirty fast-commit journal; the path is local VFS mount \u2192 jbd2_journal_load \u2192 fc_do_one_pass \u2192 ext4_fc_replay_scan(), not reachable via network packet processing.\nAC:L - The attacker fully controls the on-disk fast-commit tags, lengths, and journal dirty state in the image, so the OOB read is reliably triggered on mount with no conditions outside their control.\nPR:N - Highest-severity scenario is supplying a malicious filesystem image (USB/SD/cloud disk) that a privileged victim mounts; the attacker needs no privileges of their own. ext4 lacks FS_USERNS_MOUNT, so this is not a self-mount-by-unprivileged-userns case.\nUI:R - Exploitation requires a user or automount path to mount the malicious ext4 filesystem image, which is the interaction that reaches journal recovery and the vulnerable scan loop.\nS:U - Impact is confined to the host kernel authority that performs the mount; there is no VM/IOMMU/sandbox boundary crossing.\nC:H - This is an out-of-bounds read of journal buffer memory; attacker-controlled fc_len (u16) can cause checksum/tag parsing to read far beyond the block (not a few-byte bound), which per guidance scores Confidentiality High.\nI:N - The bug is a pure out-of-bounds read with no write primitive, heap corruption, or control-flow hijack; scanned OOB data only feeds local CRC/region logic and does not modify attacker-controlled kernel state for integrity compromise.\nA:H - Reading past the journal block into unmapped or invalid kernel memory can oops/panic the kernel during mount, fully denying availability."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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