{"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"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-43458", "lastModified": "2026-05-12T14:10:27.343", "metrics": {}, "published": "2026-05-08T15:16:58.630", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: serial: caif: hold tty->link reference in ldisc_open and ser_release", "id": "2468257", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468257"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel, specifically within the `caif_serial` line discipline. This vulnerability, a use-after-free, occurs due to improper management of the `tty->link` reference during the `ldisc_open` and `ser_release` functions. A local attacker could exploit this by triggering the `caif_serial` transmit path, which may lead to a system crash, resulting in a Denial of Service (DoS), or potentially allow for privilege escalation."], "name": "CVE-2026-43458", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43458\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43458\nhttps://lore.kernel.org/linux-cve-announce/2026050800-CVE-2026-43458-d72f@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,23a3ac2e2262a291498567418227b99e1f3606b1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,52135420e9f75853ea0c6cea7b736e3e98495f7d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,ca2ceba983bb23ea0202c2882d963253416654a3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,8460187b4852fd00bd1c76394358053f3fa4d089)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,27e43356d0defb9fc7fa25265219a3ffeb7b3e98)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,35b58d3bc716ebb9ebd10fe1cac8c1177242511c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,97a0bb491cae39478c6225381f14e9ac67b7bba7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e31d5a05948e4478ba8396063d1e1f39880928e2,288598d80a068a0e9281de35bcb4ce495f189e2a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.35"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.35)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.253,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.19,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T16:45:13.006996+00:00", "title": "Use\u2011After\u2011Free in Linux Kernel Serial CAIF Line Discipline", "updated": "2026-05-09T13:45:34.852918+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-911"]}