Back
CVE-2025-21671zram: fix potential UAF of zram table
- 7.8HighCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 88% 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: zram: fix potential UAF of zram table If zram_meta_alloc failed early, it frees allocated zram->table without setting it NULL. Which will potentially cause zram_meta_free to access the table if user reset an failed and uninitialized device.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 16 months later
· 16 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 |
|---|---|---|---|
| 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 · Modified | 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)
- 0.22% · top 88% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected ac3b5366b9b7c9d97b606532ceab43d2329a22f3 – < fe3de867f94819ba0f28e035c0b0182150147d95
- affected 0b5b0b65561b34e6e360de317e4bcd031bfabf42 – < 571d3f6045cd3a6d9f6aec33b678f3ffe97582ef
- affected 6fb92e9a52e3feae309a213950f21dfcd1eb0b40 – < 902ef8f16d5ca77edc77c30656be54186c1e99b7
- affected 74363ec674cb172d8856de25776c8f3103f05e2f – < 212fe1c0df4a150fb6298db2cfff267ceaba5402
- affected 6.1.122 – < 6.1.127
- affected 6.6.68 – < 6.6.74
- affected 6.12.7 – < 6.12.11
References
References5
- https://git.kernel.org/stable/c/fe3de867f94819ba0f28e035c0b0182150147d95 (opens in a new tab)
- https://git.kernel.org/stable/c/571d3f6045cd3a6d9f6aec33b678f3ffe97582ef (opens in a new tab)
- https://git.kernel.org/stable/c/902ef8f16d5ca77edc77c30656be54186c1e99b7 (opens in a new tab)
- https://git.kernel.org/stable/c/212fe1c0df4a150fb6298db2cfff267ceaba5402 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html (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-2025-2620 (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-2025-21671)Record last updated .