CVE-2026-80993

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80993", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.812Z", "datePublished": "2026-09-11T19:42:49.521Z", "dateUpdated": "2026-10-19T08:46:17.653Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:17.653Z"}, "descriptions": [{"lang": "en", "value": "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_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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/phy/phylink.c"], "versions": [{"version": "df874f9e52c340cc6f0a0014a97b778f67d46849", "lessThan": "b6b533f83461c3730875cf3ed5ff6362dcb67be9", "status": "affected", "versionType": "git"}, {"version": "df874f9e52c340cc6f0a0014a97b778f67d46849", "lessThan": "fb4d77553841ae85bed9b2cf03351c401e871d85", "status": "affected", "versionType": "git"}, {"version": "df874f9e52c340cc6f0a0014a97b778f67d46849", "lessThan": "f2849b1fd059ec9b3281b771e6ac5aad9feee851", "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/phy/phylink.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.14", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.3"}]}]}], "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"}], "title": "net: phylink: correctly validate returned PCS in phylink_inband_caps", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/phy/phylink.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b6b533f83461c3730875cf3ed5ff6362dcb67be9", "status": "affected", "version": "df874f9e52c340cc6f0a0014a97b778f67d46849", "versionType": "git"}, {"lessThan": "fb4d77553841ae85bed9b2cf03351c401e871d85", "status": "affected", "version": "df874f9e52c340cc6f0a0014a97b778f67d46849", "versionType": "git"}, {"lessThan": "f2849b1fd059ec9b3281b771e6ac5aad9feee851", "status": "affected", "version": "df874f9e52c340cc6f0a0014a97b778f67d46849", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/phy/phylink.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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_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."}], "id": "CVE-2026-80993", "lastModified": "2026-10-19T09:17:32.180", "metrics": {}, "published": "2026-09-11T20:19:06.237", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6b533f83461c3730875cf3ed5ff6362dcb67be9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f2849b1fd059ec9b3281b771e6ac5aad9feee851"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb4d77553841ae85bed9b2cf03351c401e871d85"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Denial of Service due to incorrect PCS validation in phylink", "id": "2532314", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532314"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's `net: phylink` component. The `phylink_inband_caps()` function does not correctly validate the return value from `mac_select_pcs`, which can return an error pointer instead of a valid Physical Coding Sublayer (PCS) object. This oversight can lead to dereferencing an invalid pointer, causing a kernel panic. A kernel panic results in a system crash, leading to a Denial of Service (DoS)."], "name": "CVE-2026-80993", "public_date": "2026-09-11T19:42:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80993\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80993\nhttps://git.kernel.org/stable/c/b6b533f83461c3730875cf3ed5ff6362dcb67be9\nhttps://git.kernel.org/stable/c/f2849b1fd059ec9b3281b771e6ac5aad9feee851\nhttps://git.kernel.org/stable/c/fb4d77553841ae85bed9b2cf03351c401e871d85"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[df874f9e52c340cc6f0a0014a97b778f67d46849,b6b533f83461c3730875cf3ed5ff6362dcb67be9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[df874f9e52c340cc6f0a0014a97b778f67d46849,fb4d77553841ae85bed9b2cf03351c401e871d85)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[df874f9e52c340cc6f0a0014a97b778f67d46849,f2849b1fd059ec9b3281b771e6ac5aad9feee851)"}}], "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": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "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": "2026-09-12T02:00:07.482530+00:00", "updated": "2026-09-21T03:00:12.554039+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}