CVE-2026-31652

{"id": "CVE-2026-31652", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "405f61996d9d2e9d497cd9f6b66f41dc28d3d1d8", "lessThan": "447f8870b484f6596d7a7130e72bd0a3f1e037bb", "versionType": "git"}, {"status": "affected", "version": "405f61996d9d2e9d497cd9f6b66f41dc28d3d1d8", "lessThan": "16c92e9bf55fa049ddb5e894dc0623dacd46a620", "versionType": "git"}, {"status": "affected", "version": "405f61996d9d2e9d497cd9f6b66f41dc28d3d1d8", "lessThan": "4c04c6b47c361612b1d70cec8f7a60b1482d1400", "versionType": "git"}], "programFiles": ["mm/damon/stat.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"status": "unaffected", "version": "0", "lessThan": "6.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.23", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.13", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["mm/damon/stat.c"], "defaultStatus": "affected"}]}], "published": "2026-04-24T15:16:44.697", "references": [{"url": "https://git.kernel.org/stable/c/16c92e9bf55fa049ddb5e894dc0623dacd46a620", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/447f8870b484f6596d7a7130e72bd0a3f1e037bb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4c04c6b47c361612b1d70cec8f7a60b1482d1400", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/stat: deallocate damon_call() failure leaking damon_ctx\n\ndamon_stat_start() always allocates the module's damon_ctx object\n(damon_stat_context). Meanwhile, if damon_call() in the function fails,\nthe damon_ctx object is not deallocated. Hence, if the damon_call() is\nfailed, and the user writes Y to \u201cenabled\u201d again, the previously\nallocated damon_ctx object is leaked.\n\nThis cannot simply be fixed by deallocating the damon_ctx object when\ndamon_call() fails. That's because damon_call() failure doesn't guarantee\nthe kdamond main function, which accesses the damon_ctx object, is\ncompletely finished. In other words, if damon_stat_start() deallocates\nthe damon_ctx object after damon_call() failure, the not-yet-terminated\nkdamond could access the freed memory (use-after-free).\n\nFix the leak while avoiding the use-after-free by keeping returning\ndamon_stat_start() without deallocating the damon_ctx object after\ndamon_call() failure, but deallocating it when the function is invoked\nagain and the kdamond is completely terminated. If the kdamond is not yet\nterminated, simply return -EAGAIN, as the kdamond will soon be terminated.\n\nThe issue was discovered [1] by sashiko."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/damon/stat: desasignar el damon_ctx que se fuga por fallo de damon_call()\n\ndamon_stat_start() siempre asigna el objeto damon_ctx del m\u00f3dulo (damon_stat_context). Mientras tanto, si damon_call() en la funci\u00f3n falla, el objeto damon_ctx no es desasignado. Por lo tanto, si damon_call() falla, y el usuario escribe Y en \u2019enabled\u2019 de nuevo, el objeto damon_ctx previamente asignado se fuga.\n\nEsto no puede ser simplemente corregido desasignando el objeto damon_ctx cuando damon_call() falla. Esto se debe a que el fallo de damon_call() no garantiza que la funci\u00f3n principal de kdamond, que accede al objeto damon_ctx, est\u00e9 completamente terminada. En otras palabras, si damon_stat_start() desasigna el objeto damon_ctx despu\u00e9s del fallo de damon_call(), el kdamond a\u00fan no terminado podr\u00eda acceder a la memoria liberada (uso despu\u00e9s de liberaci\u00f3n).\n\nCorregir la fuga evitando el uso despu\u00e9s de liberaci\u00f3n, haciendo que damon_stat_start() siga retornando sin desasignar el objeto damon_ctx despu\u00e9s del fallo de damon_call(), pero desasign\u00e1ndolo cuando la funci\u00f3n es invocada de nuevo y el kdamond est\u00e1 completamente terminado. Si el kdamond a\u00fan no est\u00e1 terminado, simplemente retornar -EAGAIN, ya que el kdamond pronto ser\u00e1 terminado.\n\nEl problema fue descubierto [1] por sashiko."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0DC92196-2D7B-4F07-A19F-B43E0624C441", "versionEndExcluding": "6.18.23", "versionStartIncluding": "6.17.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1490EF9B-9080-481C-8D22-1306AAE664E4", "versionEndExcluding": "6.19.13", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7CC8B11D-82DC-4958-8DC7-BF5CC829A5E9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}