{"id":"CVE-2026-80993","title":"net: phylink: correctly validate returned PCS in phylink_inband_caps","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phylink: correctly validate returned PCS in phylink_inband_caps\n\nIn phylink_inband_caps(), the PCS returned by mac_select_pcs is only\nchecked if NULL but mac_selec…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-476"],"vendor":"Linux","product":"Linux","affected":["Linux >= df874f9e52c340cc6f0a0014a97b778f67d46849 < b6b533f83461c3730875cf3ed5ff6362dcb67be9","Linux >= df874f9e52c340cc6f0a0014a97b778f67d46849 < fb4d77553841ae85bed9b2cf03351c401e871d85","Linux >= df874f9e52c340cc6f0a0014a97b778f67d46849 < f2849b1fd059ec9b3281b771e6ac5aad9feee851","Linux 6.14"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:46:17.653Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80993","references":[{"url":"https://git.kernel.org/stable/c/b6b533f83461c3730875cf3ed5ff6362dcb67be9"},{"url":"https://git.kernel.org/stable/c/fb4d77553841ae85bed9b2cf03351c401e871d85"},{"url":"https://git.kernel.org/stable/c/f2849b1fd059ec9b3281b771e6ac5aad9feee851"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80993.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80993"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532314"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80993"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80993"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80993.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.1064,"ingestedAt":"2026-09-14T00:35:28.531Z","slug":"CVE-2026-80993","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: phylink: correctly validate returned PCS in phylink_inband_caps\n\nIn phylink_inband_caps(), the PCS returned by mac_select_pcs is only\nchecked if NULL but mac_select_pcs can also return an error pointer.\n\nThis can cause a kernel panic as phylink_pcs_inband_caps() only checks\nif passed PCS is not NULL and directly dereference ops from the phylink_pcs\nstruct.\n\nUse the IS_ERR_OR_NULL macro to address both case where the returned\nPCS can be NULL or an error pointer and prevent a kernel panic.\n\n## Affected\n\n- `Linux >= df874f9e52c340cc6f0a0014a97b778f67d46849 < b6b533f83461c3730875cf3ed5ff6362dcb67be9`\n- `Linux >= df874f9e52c340cc6f0a0014a97b778f67d46849 < fb4d77553841ae85bed9b2cf03351c401e871d85`\n- `Linux >= df874f9e52c340cc6f0a0014a97b778f67d46849 < f2849b1fd059ec9b3281b771e6ac5aad9feee851`\n- `Linux 6.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80993.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204152,"id":"CVE-2026-80993","ts":1789490233685,"field":"cvss","old":null,"new":"5.5"},{"seq":204151,"id":"CVE-2026-80993","ts":1789490233685,"field":"severity","old":"none","new":"medium"},{"seq":147389,"id":"CVE-2026-80993","ts":1789270210712,"field":"cvss","old":null,"new":"4.1"},{"seq":147388,"id":"CVE-2026-80993","ts":1789270210712,"field":"severity","old":"none","new":"medium"},{"seq":109147,"id":"CVE-2026-80993","ts":1789183730493,"field":"cvss","old":null,"new":"4.1"},{"seq":109146,"id":"CVE-2026-80993","ts":1789183730493,"field":"severity","old":"none","new":"medium"}]}