{"api_version":"1","generated_at":"2026-08-18T05:18:23+00:00","cve":"CVE-2026-68379","urls":{"html":"https://cve.report/CVE-2026-68379","api":"https://cve.report/api/cve/CVE-2026-68379.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68379","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68379"},"summary":{"title":"tcp: fix TIME_WAIT socket reference leak on PSP policy failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TIME_WAIT socket reference leak on PSP policy failure\n\nRelease the TIME_WAIT socket reference and jump to discard_it\nupon PSP policy failure in both IPv4 and IPv6 receive paths.\nThis prevents a memory leak of tcp_tw_bucket structures.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:30","updated_at":"2026-08-17 06:17:46"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/2c1931a81122c3cdc4c89448fe0442c69e21c0d5","name":"https://git.kernel.org/stable/c/2c1931a81122c3cdc4c89448fe0442c69e21c0d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/374742a961becbbfc7fbfd1382d978a05e492741","name":"https://git.kernel.org/stable/c/374742a961becbbfc7fbfd1382d978a05e492741","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e666af5dcc905ba694745963174d232deb478c55","name":"https://git.kernel.org/stable/c/e666af5dcc905ba694745963174d232deb478c55","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68379","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68379","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 659a2899a57da59f433182eba571881884d6323e e666af5dcc905ba694745963174d232deb478c55 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 659a2899a57da59f433182eba571881884d6323e 374742a961becbbfc7fbfd1382d978a05e492741 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 659a2899a57da59f433182eba571881884d6323e 2c1931a81122c3cdc4c89448fe0442c69e21c0d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"68379","cve":"CVE-2026-68379","epss":"0.006090000","percentile":"0.462720000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/tcp_ipv4.c","net/ipv6/tcp_ipv6.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e666af5dcc905ba694745963174d232deb478c55","status":"affected","version":"659a2899a57da59f433182eba571881884d6323e","versionType":"git"},{"lessThan":"374742a961becbbfc7fbfd1382d978a05e492741","status":"affected","version":"659a2899a57da59f433182eba571881884d6323e","versionType":"git"},{"lessThan":"2c1931a81122c3cdc4c89448fe0442c69e21c0d5","status":"affected","version":"659a2899a57da59f433182eba571881884d6323e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/tcp_ipv4.c","net/ipv6/tcp_ipv6.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TIME_WAIT socket reference leak on PSP policy failure\n\nRelease the TIME_WAIT socket reference and jump to discard_it\nupon PSP policy failure in both IPv4 and IPv6 receive paths.\nThis prevents a memory leak of tcp_tw_bucket structures."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - The leak is triggered entirely by a received TCP segment processed in tcp_v4_rcv()/tcp_v6_rcv() do_time_wait path; a remote peer sending a crafted SYN to a socket in TIME_WAIT reaches the faulty code with no local access.\nAC:L - The attacker fully controls the trigger: send a plain non-PSP-encapsulated SYN with a sequence number above tw_rcv_nxt on the known 4-tuple of a just-closed PSP connection, which deterministically yields TCP_TW_SYN plus a PSP policy failure and leaks the reference every time.\nPR:N - No authentication or privileges are needed; the packet is handled in the TCP input path before any socket-level authorization, and the sender need only be the remote endpoint of a previously established connection.\nUI:N - Processing happens in softirq context on packet receive with no involvement from any local user or administrator.\nS:U - The leaked tcp_timewait_sock and psp_assoc objects are kernel memory managed by the same security authority as the vulnerable TCP receive path; no privilege or virtualization boundary is crossed.\nC:N - The missing inet_twsk_put() only omits a refcount decrement; no memory is read out of bounds, no freed object is accessed, and no data is returned to the attacker.\nI:N - No kernel data is modified or corrupted; the refcount simply never reaches zero, and refcount_t saturates rather than wrapping, so no use-after-free or write primitive arises.\nA:H - Each triggering packet permanently leaks a tcp_timewait_sock slab object plus its pinned psp_assoc, never reclaimed for the life of the boot; an unauthenticated peer can repeat this across arbitrarily many connections to exhaust kernel memory and drive the system to OOM."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:04:25.324Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e666af5dcc905ba694745963174d232deb478c55"},{"url":"https://git.kernel.org/stable/c/374742a961becbbfc7fbfd1382d978a05e492741"},{"url":"https://git.kernel.org/stable/c/2c1931a81122c3cdc4c89448fe0442c69e21c0d5"}],"title":"tcp: fix TIME_WAIT socket reference leak on PSP policy failure","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68379","datePublished":"2026-08-10T12:03:57.537Z","dateReserved":"2026-07-30T09:28:09.387Z","dateUpdated":"2026-08-17T05:04:25.324Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:30","lastModifiedDate":"2026-08-17 06:17:46","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68379","Ordinal":"1","Title":"tcp: fix TIME_WAIT socket reference leak on PSP policy failure","CVE":"CVE-2026-68379","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68379","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TIME_WAIT socket reference leak on PSP policy failure\n\nRelease the TIME_WAIT socket reference and jump to discard_it\nupon PSP policy failure in both IPv4 and IPv6 receive paths.\nThis prevents a memory leak of tcp_tw_bucket structures.","Type":"Description","Title":"tcp: fix TIME_WAIT socket reference leak on PSP policy failure"}]}}}