CVE-2022-49078lz4: fix LZ4_decompress_safe_partial read out of bound
- 7.8HighCVSS base score
- 0.28%Exploitation in 30 daysEPSS · top 79% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: lz4: fix LZ4_decompress_safe_partial read out of bound When partialDecoding, it is EOF if we've either filled the output buffer or can't proceed with reading an offset for following match. In some extreme corner cases when compressed data is suitably corrupted, UAF will occur. As reported by KASAN [1], LZ4_decompress_safe_partial may lead to read out of bound problem during decoding. lz4 upstream has fixed it [2] and this issue has been disscussed here [3] before. current decompression routine was ported from lz4 v1.8.3, bumping lib/lz4 to v1.9.+ is certainly a huge work to be done later, so, we'd better fix it first. [1] https://lore.kernel.org/all/[email protected]/ [2] https://github.com/lz4/lz4/commit/c5d6f8a8be3927c0bec91bcc58667a6cfad244ad# [3] https://lore.kernel.org/all/[email protected]/
Timeline
ID reserved
By Linux
Published
- 18 months later
· 18 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CISA-ADPADP (enrichment) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.28% · top 79% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 2209fda323e2fd2a2d0885595fd5097717f8d2aa – < 73953dfa9d50e5c9fe98ee13fd1d3427aa12a0a3
- affected 2209fda323e2fd2a2d0885595fd5097717f8d2aa – < 6adc01a7aa37445dafe8846faa0610a86029b253
- affected 2209fda323e2fd2a2d0885595fd5097717f8d2aa – < 9fb8bc6cfc58773ce95414e11c9ccc8fc6ac4927
- affected 2209fda323e2fd2a2d0885595fd5097717f8d2aa – < e64dbe97c05c769525cbca099ddbd22485630235
- affected 2209fda323e2fd2a2d0885595fd5097717f8d2aa – < 467d5e200ab4486b744fe1776154a43d1aa22d4b
- affected 2209fda323e2fd2a2d0885595fd5097717f8d2aa – < eafc0a02391b7b36617b36c97c4b5d6832cf5e24
- affected 4.20
- unaffected < 4.20
- unaffected 5.4.189 – ≤ 5.4.*
- unaffected 5.10.111 – ≤ 5.10.*
- unaffected 5.15.34 – ≤ 5.15.*
- unaffected 5.16.20 – ≤ 5.16.*
- unaffected 5.17.3 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References
References6
- https://git.kernel.org/stable/c/73953dfa9d50e5c9fe98ee13fd1d3427aa12a0a3 (opens in a new tab)
- https://git.kernel.org/stable/c/6adc01a7aa37445dafe8846faa0610a86029b253 (opens in a new tab)
- https://git.kernel.org/stable/c/9fb8bc6cfc58773ce95414e11c9ccc8fc6ac4927 (opens in a new tab)
- https://git.kernel.org/stable/c/e64dbe97c05c769525cbca099ddbd22485630235 (opens in a new tab)
- https://git.kernel.org/stable/c/467d5e200ab4486b744fe1776154a43d1aa22d4b (opens in a new tab)
- https://git.kernel.org/stable/c/eafc0a02391b7b36617b36c97c4b5d6832cf5e24 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2022-55126 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2022-49078)Record last updated .