{"api_version":"1","generated_at":"2026-10-06T10:21:33+00:00","cve":"CVE-2026-98261","urls":{"html":"https://cve.report/CVE-2026-98261","api":"https://cve.report/api/cve/CVE-2026-98261.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98261","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98261"},"summary":{"title":"cifs: Fix server use-after-free in cifs_chan_skip_or_disable()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix server use-after-free in cifs_chan_skip_or_disable()\n\nWhen a secondary channel is no longer supported by the server,\ncifs_chan_skip_or_disable() drops the channel reference with\ncifs_put_tcp_session() and then continues to use the server pointer by\ncalling cifs_signal_cifsd_for_reconnect() on it and reading its\nprimary_server pointer. cifs_put_tcp_session() can drop the last\nreference of the channel and tear it down, so both the channel and the\nprimary server (whose reference is also dropped by\ncifs_put_tcp_session()) can be freed before they are signaled for\nreconnect.\n\nSignal the channel and the primary server and capture the primary\nserver pointer before dropping the channel reference with\ncifs_put_tcp_session().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-06 09:18:15","updated_at":"2026-10-06 09:18:15"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780","name":"https://git.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8","name":"https://git.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0338489960ddad6368bce55e8adbc176c523093d","name":"https://git.kernel.org/stable/c/0338489960ddad6368bce55e8adbc176c523093d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227","name":"https://git.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7","name":"https://git.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98261","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98261","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50e8363ecc85da49764781da90ebffe1a657b370 0338489960ddad6368bce55e8adbc176c523093d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f591062bdbf4742b7f1622173017f19e927057b0 edd52eae5fcfb8433b6bb0e7cd98db438fe01227 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f591062bdbf4742b7f1622173017f19e927057b0 fcc0a935bb6e37ecbf7e4335061309f896f35780 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f591062bdbf4742b7f1622173017f19e927057b0 7a1b27780b113583a94256d58dabfe7c0d9286e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f591062bdbf4742b7f1622173017f19e927057b0 717e0a25036b6c92cecace30913b2d874a4c22b8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.15 6.6.158 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.7.3 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/smb2pdu.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0338489960ddad6368bce55e8adbc176c523093d","status":"affected","version":"50e8363ecc85da49764781da90ebffe1a657b370","versionType":"git"},{"lessThan":"edd52eae5fcfb8433b6bb0e7cd98db438fe01227","status":"affected","version":"f591062bdbf4742b7f1622173017f19e927057b0","versionType":"git"},{"lessThan":"fcc0a935bb6e37ecbf7e4335061309f896f35780","status":"affected","version":"f591062bdbf4742b7f1622173017f19e927057b0","versionType":"git"},{"lessThan":"7a1b27780b113583a94256d58dabfe7c0d9286e7","status":"affected","version":"f591062bdbf4742b7f1622173017f19e927057b0","versionType":"git"},{"lessThan":"717e0a25036b6c92cecace30913b2d874a4c22b8","status":"affected","version":"f591062bdbf4742b7f1622173017f19e927057b0","versionType":"git"},{"status":"affected","version":"d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4","versionType":"git"},{"lessThan":"6.6.158","status":"affected","version":"6.6.15","versionType":"semver"},{"lessThan":"6.8","status":"affected","version":"6.7.3","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/smb2pdu.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.54","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"6.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.54","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.8","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc4","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix server use-after-free in cifs_chan_skip_or_disable()\n\nWhen a secondary channel is no longer supported by the server,\ncifs_chan_skip_or_disable() drops the channel reference with\ncifs_put_tcp_session() and then continues to use the server pointer by\ncalling cifs_signal_cifsd_for_reconnect() on it and reading its\nprimary_server pointer. cifs_put_tcp_session() can drop the last\nreference of the channel and tear it down, so both the channel and the\nprimary server (whose reference is also dropped by\ncifs_put_tcp_session()) can be freed before they are signaled for\nreconnect.\n\nSignal the channel and the primary server and capture the primary\nserver pointer before dropping the channel reference with\ncifs_put_tcp_session()."}],"providerMetadata":{"dateUpdated":"2026-10-06T08:45:25.361Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0338489960ddad6368bce55e8adbc176c523093d"},{"url":"https://git.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227"},{"url":"https://git.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780"},{"url":"https://git.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7"},{"url":"https://git.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8"}],"title":"cifs: Fix server use-after-free in cifs_chan_skip_or_disable()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98261","datePublished":"2026-10-06T08:45:25.361Z","dateReserved":"2026-09-25T10:25:14.332Z","dateUpdated":"2026-10-06T08:45:25.361Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 09:18:15","lastModifiedDate":"2026-10-06 09:18:15","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98261","Ordinal":"1","Title":"cifs: Fix server use-after-free in cifs_chan_skip_or_disable()","CVE":"CVE-2026-98261","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98261","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix server use-after-free in cifs_chan_skip_or_disable()\n\nWhen a secondary channel is no longer supported by the server,\ncifs_chan_skip_or_disable() drops the channel reference with\ncifs_put_tcp_session() and then continues to use the server pointer by\ncalling cifs_signal_cifsd_for_reconnect() on it and reading its\nprimary_server pointer. cifs_put_tcp_session() can drop the last\nreference of the channel and tear it down, so both the channel and the\nprimary server (whose reference is also dropped by\ncifs_put_tcp_session()) can be freed before they are signaled for\nreconnect.\n\nSignal the channel and the primary server and capture the primary\nserver pointer before dropping the channel reference with\ncifs_put_tcp_session().","Type":"Description","Title":"cifs: Fix server use-after-free in cifs_chan_skip_or_disable()"}]}}}