CVE-2026-63952
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
memfd: deny writeable mappings when implying SEAL_WRITE
In the Linux kernel, the following vulnerability has been resolved: memfd: deny writeable mappings when implying SEAL_WRITE When SEAL_EXEC is added, SEAL_WRITE is implied to make W^X. But the implied seal is set after the check that makes sure the memfd can not have any writable mappings. This means one can use SEAL_EXEC to apply SEAL_WRITE while having writeable mappings. This breaks the contract that SEAL_WRITE provides and can be used by an attacker to pass a memfd that appears to be write sealed but can still be modified arbitrarily. Fix this by adding the implied seals before the call for mapping_deny_writable() is done.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| c4f75bc8bd6b3d62665e1f5400c419540edb5601 | affected | git | b3f4f82d1315f1439059a83d1c22c51a5b43d99e | Unavailable | None listed |
| c4f75bc8bd6b3d62665e1f5400c419540edb5601 | affected | git | 3be2a24f7f72ad7321ed6ad1715b956a4527bcf4 | Unavailable | None listed |
| c4f75bc8bd6b3d62665e1f5400c419540edb5601 | affected | git | 0995d1f79aed8ccbf62056189dd53fd19726ea08 | Unavailable | None listed |
| c4f75bc8bd6b3d62665e1f5400c419540edb5601 | affected | git | 555702282d4536a865dfffb1cd4f6028f196e7e8 | Unavailable | None listed |
| c4f75bc8bd6b3d62665e1f5400c419540edb5601 | affected | git | 3b041514cb6eae45869b020f743c14d983363222 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.3 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.3 | Unavailable | None listed |
| 6.6.143 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.93 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.35 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.0.12 | unaffected | semver | Unavailable | 7.0.* | None listed |
| 7.1 | unaffected | original_commit_for_fix | Unavailable | * | None listed |