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CVE-2026-63952

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 wri
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:108f71f28b283460e1ad9951274b9d606e2d8a694013b065237e79ddb03fa0cf
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"Linux","programFiles":["mm/memfd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b3f4f82d1315f1439059a83d1c22c51a5b43d99e","status":"affected","version":"c4f75bc8bd6b3d62665e1f5400c419540edb5601","versionType":"git"},{"lessThan":"3be2a24f7f72ad7321ed6ad1715b956a4527bcf4","status":"affected","version":"c4f75bc8bd6b3d62665e1f5400c419540edb5601","versionType":"git"},{"lessThan":"0995d1f79aed8ccbf62056189dd53fd19726ea08","status":"affected","version":"c4f75bc8bd6b3d62665e1f5400c419540ed…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["mm/memfd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.3"},{"lessThan":"6.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"Linux","programFiles":["mm/memfd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b3f4f82d1315f1439059a83d1c22c51a5b43d99e","status":"affected","version":"c4f75bc8bd6b3d62665e1f5400c419540edb5601","versionType":"git"},{"lessThan":"3be2a24f7f72ad7321ed6ad1715b956a4527bcf4","status":"affected","version":"c4f75bc8bd6b3d62665e1f5400c419540edb5601","versionType":"git"},{"lessThan":"0995d1f79aed8ccbf62056189dd53fd19726ea08","status":"affected","version":"c4f75bc8bd6b3d62665e1f5400c419540ed…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Linux","programFiles":["mm/memfd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.3"},{"lessThan":"6.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/metrics/0/cvssV3_1

Source references

5 source assertions
{"url":"https://git.kernel.org/stable/c/0995d1f79aed8ccbf62056189dd53fd19726ea08"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/3b041514cb6eae45869b020f743c14d983363222"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/3be2a24f7f72ad7321ed6ad1715b956a4527bcf4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/555702282d4536a865dfffb1cd4f6028f196e7e8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/b3f4f82d1315f1439059a83d1c22c51a5b43d99e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6a0aca71b5b1dda0fc88cfb7d7202ce381d602ff9dae2362b6c35148950af4a1 · sha256:850cd77ae9629429… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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