{"api_version":"1","generated_at":"2026-05-13T08:50:19+00:00","cve":"CVE-2026-43458","urls":{"html":"https://cve.report/CVE-2026-43458","api":"https://cve.report/api/cve/CVE-2026-43458.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43458","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43458"},"summary":{"title":"serial: caif: hold tty->link reference in ldisc_open and ser_release","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: caif: hold tty->link reference in ldisc_open and ser_release\n\nA reproducer triggers a KASAN slab-use-after-free in pty_write_room()\nwhen caif_serial's TX path calls tty_write_room(). The faulting access\nis on tty->link->port.\n\nHold an extra kref on tty->link for the lifetime of the caif_serial line\ndiscipline: get it in ldisc_open() and drop it in ser_release(), and\nalso drop it on the ldisc_open() error path.\n\nWith this change applied, the reproducer no longer triggers the UAF in\nmy testing.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 15:16:58","updated_at":"2026-05-12 14:10:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98","name":"https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a","name":"https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c","name":"https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1","name":"https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089","name":"https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7","name":"https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d","name":"https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3","name":"https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43458","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43458","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e31d5a05948e4478ba8396063d1e1f39880928e2 23a3ac2e2262a291498567418227b99e1f3606b1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e31d5a05948e4478ba8396063d1e1f39880928e2 52135420e9f75853ea0c6cea7b736e3e98495f7d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e31d5a05948e4478ba8396063d1e1f39880928e2 ca2ceba983bb23ea0202c2882d963253416654a3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e31d5a05948e4478ba8396063d1e1f39880928e2 8460187b4852fd00bd1c76394358053f3fa4d089 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.19 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.9 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"43458","cve":"CVE-2026-43458","epss":"0.000240000","percentile":"0.070360000","score_date":"2026-05-12","updated_at":"2026-05-13 00:11:53"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/caif/caif_serial.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"23a3ac2e2262a291498567418227b99e1f3606b1","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"},{"lessThan":"52135420e9f75853ea0c6cea7b736e3e98495f7d","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"},{"lessThan":"ca2ceba983bb23ea0202c2882d963253416654a3","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"},{"lessThan":"8460187b4852fd00bd1c76394358053f3fa4d089","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"},{"lessThan":"27e43356d0defb9fc7fa25265219a3ffeb7b3e98","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"},{"lessThan":"35b58d3bc716ebb9ebd10fe1cac8c1177242511c","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"},{"lessThan":"97a0bb491cae39478c6225381f14e9ac67b7bba7","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"},{"lessThan":"288598d80a068a0e9281de35bcb4ce495f189e2a","status":"affected","version":"e31d5a05948e4478ba8396063d1e1f39880928e2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/caif/caif_serial.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.35"},{"lessThan":"2.6.35","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.19","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.19","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.9","versionStartIncluding":"2.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.35","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: caif: hold tty->link reference in ldisc_open and ser_release\n\nA reproducer triggers a KASAN slab-use-after-free in pty_write_room()\nwhen caif_serial's TX path calls tty_write_room(). The faulting access\nis on tty->link->port.\n\nHold an extra kref on tty->link for the lifetime of the caif_serial line\ndiscipline: get it in ldisc_open() and drop it in ser_release(), and\nalso drop it on the ldisc_open() error path.\n\nWith this change applied, the reproducer no longer triggers the UAF in\nmy testing."}],"providerMetadata":{"dateUpdated":"2026-05-11T22:24:58.635Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1"},{"url":"https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d"},{"url":"https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3"},{"url":"https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089"},{"url":"https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98"},{"url":"https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c"},{"url":"https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7"},{"url":"https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a"}],"title":"serial: caif: hold tty->link reference in ldisc_open and ser_release","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43458","datePublished":"2026-05-08T14:22:21.997Z","dateReserved":"2026-05-01T14:12:56.010Z","dateUpdated":"2026-05-11T22:24:58.635Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 15:16:58","lastModifiedDate":"2026-05-12 14:10:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43458","Ordinal":"1","Title":"serial: caif: hold tty->link reference in ldisc_open and ser_rel","CVE":"CVE-2026-43458","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43458","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: caif: hold tty->link reference in ldisc_open and ser_release\n\nA reproducer triggers a KASAN slab-use-after-free in pty_write_room()\nwhen caif_serial's TX path calls tty_write_room(). The faulting access\nis on tty->link->port.\n\nHold an extra kref on tty->link for the lifetime of the caif_serial line\ndiscipline: get it in ldisc_open() and drop it in ser_release(), and\nalso drop it on the ldisc_open() error path.\n\nWith this change applied, the reproducer no longer triggers the UAF in\nmy testing.","Type":"Description","Title":"serial: caif: hold tty->link reference in ldisc_open and ser_rel"}]}}}