CVE-2023-2640
On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 15.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 15.20% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- canonical/ubuntu linux
- Source
- security@ubuntu.com
EPSS 15.2% since 10 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640Third Party Advisory
- https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.htmlMailing List, Patch
- https://ubuntu.com/security/notices/USN-6250-1Vendor Advisory
- https://wiz.io/blog/ubuntu-overlayfs-vulnerabilityExploit, Mitigation, Third Party Advisory
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640Third Party Advisory
- https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.htmlMailing List, Patch
- https://ubuntu.com/security/notices/USN-6250-1Vendor Advisory
- https://wiz.io/blog/ubuntu-overlayfs-vulnerabilityExploit, Mitigation, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.