{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31458", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.092Z", "datePublished": "2026-04-22T13:53:50.883Z", "dateUpdated": "2026-04-22T13:53:50.883Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-22T13:53:50.883Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]\n\nMultiple sysfs command paths dereference contexts_arr[0] without first\nverifying that kdamond->contexts->nr == 1. A user can set nr_contexts to\n0 via sysfs while DAMON is running, causing NULL pointer dereferences.\n\nIn more detail, the issue can be triggered by privileged users like\nbelow.\n\nFirst, start DAMON and make contexts directory empty\n(kdamond->contexts->nr == 0).\n\n # damo start\n # cd /sys/kernel/mm/damon/admin/kdamonds/0\n # echo 0 > contexts/nr_contexts\n\nThen, each of below commands will cause the NULL pointer dereference.\n\n # echo update_schemes_stats > state\n # echo update_schemes_tried_regions > state\n # echo update_schemes_tried_bytes > state\n # echo update_schemes_effective_quotas > state\n # echo update_tuned_intervals > state\n\nGuard all commands (except OFF) at the entry point of\ndamon_sysfs_handle_cmd()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/sysfs.c"], "versions": [{"version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7", "lessThan": "aba546061341b56e9ffb37e1eb661a3628b6ec12", "status": "affected", "versionType": "git"}, {"version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7", "lessThan": "1e8da792672481d603fa7cd0d815577220a3ee27", "status": "affected", "versionType": "git"}, {"version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7", "lessThan": "708033c231bd782858f4ddbb46ee874a5a5fbdab", "status": "affected", "versionType": "git"}, {"version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7", "lessThan": "bbe03ad3fb9e714191757ca7b41582f930be7be2", "status": "affected", "versionType": "git"}, {"version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7", "lessThan": "1bfe9fb5ed2667fb075682408b776b5273162615", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/sysfs.c"], "versions": [{"version": "5.18", "status": "affected"}, {"version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "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": "5.18", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/aba546061341b56e9ffb37e1eb661a3628b6ec12"}, {"url": "https://git.kernel.org/stable/c/1e8da792672481d603fa7cd0d815577220a3ee27"}, {"url": "https://git.kernel.org/stable/c/708033c231bd782858f4ddbb46ee874a5a5fbdab"}, {"url": "https://git.kernel.org/stable/c/bbe03ad3fb9e714191757ca7b41582f930be7be2"}, {"url": "https://git.kernel.org/stable/c/1bfe9fb5ed2667fb075682408b776b5273162615"}], "title": "mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]\n\nMultiple sysfs command paths dereference contexts_arr[0] without first\nverifying that kdamond->contexts->nr == 1. A user can set nr_contexts to\n0 via sysfs while DAMON is running, causing NULL pointer dereferences.\n\nIn more detail, the issue can be triggered by privileged users like\nbelow.\n\nFirst, start DAMON and make contexts directory empty\n(kdamond->contexts->nr == 0).\n\n # damo start\n # cd /sys/kernel/mm/damon/admin/kdamonds/0\n # echo 0 > contexts/nr_contexts\n\nThen, each of below commands will cause the NULL pointer dereference.\n\n # echo update_schemes_stats > state\n # echo update_schemes_tried_regions > state\n # echo update_schemes_tried_bytes > state\n # echo update_schemes_effective_quotas > state\n # echo update_tuned_intervals > state\n\nGuard all commands (except OFF) at the entry point of\ndamon_sysfs_handle_cmd()."}], "id": "CVE-2026-31458", "lastModified": "2026-04-22T14:16:41.260", "metrics": {}, "published": "2026-04-22T14:16:41.260", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1bfe9fb5ed2667fb075682408b776b5273162615"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1e8da792672481d603fa7cd0d815577220a3ee27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/708033c231bd782858f4ddbb46ee874a5a5fbdab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aba546061341b56e9ffb37e1eb661a3628b6ec12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bbe03ad3fb9e714191757ca7b41582f930be7be2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]", "id": "2460725", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460725"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1284", "details": ["A flaw was found in the Linux kernel. A privileged local user can exploit this by manipulating the `nr_contexts` parameter in the `mm/damon/sysfs` interface to zero while the DAMON (Data Access MONitor) subsystem is active. This leads to a null pointer dereference when certain sysfs commands are subsequently executed, potentially causing a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-31458", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31458\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31458\nhttps://lore.kernel.org/linux-cve-announce/2026042250-CVE-2026-31458-5a8e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ac32b8affb5a384253dbb8339bd2d0e91add0b7,aba546061341b56e9ffb37e1eb661a3628b6ec12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ac32b8affb5a384253dbb8339bd2d0e91add0b7,1e8da792672481d603fa7cd0d815577220a3ee27)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ac32b8affb5a384253dbb8339bd2d0e91add0b7,708033c231bd782858f4ddbb46ee874a5a5fbdab)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ac32b8affb5a384253dbb8339bd2d0e91add0b7,bbe03ad3fb9e714191757ca7b41582f930be7be2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ac32b8affb5a384253dbb8339bd2d0e91add0b7,1bfe9fb5ed2667fb075682408b776b5273162615)"}}], "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": "5.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.11,6.20.0)"}}, {"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": "2026-04-22T17:15:21.908909+00:00", "updated": "2026-04-22T17:15:21.908965+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}