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CVE-2026-63918

In the Linux kernel, the following vulnerability has been resolved: l2tp: use refcount_inc_not_zero in l2tp_session_get_by_ifname A reader in l2tp_session_get_by_ifname() can return a pointer to a session whose refcount has reached zero. The getter takes its reference with plain refcount_inc(), but every other session getter in the same file (l2tp_v2_session_get, l2tp_v3_session_get, and the corresponding _get_next variants) uses refcount_inc_not_zero() because the IDR/RCU lookup can race with
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cc42232f4d6697fd0c79c6b6947220740fb9b9e921baf7bc48e972d821579f01
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":"affected","product":"Linux","programFiles":["net/l2tp/l2tp_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.12"},{"lessThan":"6.12","status":"unaffected","version":"0","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.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrE…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/l2tp/l2tp_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ee80455feffb9cb62b5b58715cabeff495e666b2","status":"affected","version":"abe7a1a7d0b69e63b1bca5f9531023a52336784f","versionType":"git"},{"lessThan":"947013fd7c8c35dd5856557b215840098a3f67f8","status":"affected","version":"abe7a1a7d0b69e63b1bca5f9531023a52336784f","versionType":"git"},{"lessThan":"782d60a6596aee9b29c2eecfa70033899278bf65","status":"affected","version":"abe7a1a7d0b69e63b1bca5f95…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["net/l2tp/l2tp_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.12"},{"lessThan":"6.12","status":"unaffected","version":"0","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.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrE…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/l2tp/l2tp_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ee80455feffb9cb62b5b58715cabeff495e666b2","status":"affected","version":"abe7a1a7d0b69e63b1bca5f9531023a52336784f","versionType":"git"},{"lessThan":"947013fd7c8c35dd5856557b215840098a3f67f8","status":"affected","version":"abe7a1a7d0b69e63b1bca5f9531023a52336784f","versionType":"git"},{"lessThan":"782d60a6596aee9b29c2eecfa70033899278bf65","status":"affected","version":"abe7a1a7d0b69e63b1bca5f95…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/metrics/0/cvssV3_1

Source references

4 source assertions
{"url":"https://git.kernel.org/stable/c/05f95729ca844704d15e49ce14868af4b403b32b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/782d60a6596aee9b29c2eecfa70033899278bf65"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/947013fd7c8c35dd5856557b215840098a3f67f8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/ee80455feffb9cb62b5b58715cabeff495e666b2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:07109e091dfcc1a140f97e46a3bde8d28721c6e72753b6fda16044ac1ef60d77 · sha256:9c17fa20f8da0d96… · /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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