{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43458", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.010Z", "datePublished": "2026-05-08T14:22:21.997Z", "dateUpdated": "2026-05-11T22:24:58.635Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:24:58.635Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/caif/caif_serial.c"], "versions": [{"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "23a3ac2e2262a291498567418227b99e1f3606b1", "status": "affected", "versionType": "git"}, {"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "52135420e9f75853ea0c6cea7b736e3e98495f7d", "status": "affected", "versionType": "git"}, {"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "ca2ceba983bb23ea0202c2882d963253416654a3", "status": "affected", "versionType": "git"}, {"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "8460187b4852fd00bd1c76394358053f3fa4d089", "status": "affected", "versionType": "git"}, {"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "27e43356d0defb9fc7fa25265219a3ffeb7b3e98", "status": "affected", "versionType": "git"}, {"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "35b58d3bc716ebb9ebd10fe1cac8c1177242511c", "status": "affected", "versionType": "git"}, {"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "97a0bb491cae39478c6225381f14e9ac67b7bba7", "status": "affected", "versionType": "git"}, {"version": "e31d5a05948e4478ba8396063d1e1f39880928e2", "lessThan": "288598d80a068a0e9281de35bcb4ce495f189e2a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/caif/caif_serial.c"], "versions": [{"version": "2.6.35", "status": "affected"}, {"version": "0", "lessThan": "2.6.35", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.18.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.0"}]}]}], "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"}}}}