{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23044", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.944Z", "datePublished": "2026-02-04T16:00:27.153Z", "dateUpdated": "2026-05-11T21:58:54.981Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:58:54.981Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPM: hibernate: Fix crash when freeing invalid crypto compressor\n\nWhen crypto_alloc_acomp() fails, it returns an ERR_PTR value, not NULL.\n\nThe cleanup code in save_compressed_image() and load_compressed_image()\nunconditionally calls crypto_free_acomp() without checking for ERR_PTR,\nwhich causes crypto_acomp_tfm() to dereference an invalid pointer and\ncrash the kernel.\n\nThis can be triggered when the compression algorithm is unavailable\n(e.g., CONFIG_CRYPTO_LZO not enabled).\n\nFix by adding IS_ERR_OR_NULL() checks before calling crypto_free_acomp()\nand acomp_request_free(), similar to the existing kthread_stop() check.\n\n[ rjw: Added 2 empty code lines ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/power/swap.c"], "versions": [{"version": "b03d542c3c9569f549b1ba0cf7f4d90151fbf8ab", "lessThan": "b7a883b0135dbc6817e90a829421c9fc8cd94bad", "status": "affected", "versionType": "git"}, {"version": "b03d542c3c9569f549b1ba0cf7f4d90151fbf8ab", "lessThan": "7966cf0ebe32c981bfa3db252cb5fc3bb1bf2e77", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/power/swap.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.6", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "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": "6.15", "versionEndExcluding": "6.18.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b7a883b0135dbc6817e90a829421c9fc8cd94bad"}, {"url": "https://git.kernel.org/stable/c/7966cf0ebe32c981bfa3db252cb5fc3bb1bf2e77"}], "title": "PM: hibernate: Fix crash when freeing invalid crypto compressor", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPM: hibernate: Fix crash when freeing invalid crypto compressor\n\nWhen crypto_alloc_acomp() fails, it returns an ERR_PTR value, not NULL.\n\nThe cleanup code in save_compressed_image() and load_compressed_image()\nunconditionally calls crypto_free_acomp() without checking for ERR_PTR,\nwhich causes crypto_acomp_tfm() to dereference an invalid pointer and\ncrash the kernel.\n\nThis can be triggered when the compression algorithm is unavailable\n(e.g., CONFIG_CRYPTO_LZO not enabled).\n\nFix by adding IS_ERR_OR_NULL() checks before calling crypto_free_acomp()\nand acomp_request_free(), similar to the existing kthread_stop() check.\n\n[ rjw: Added 2 empty code lines ]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nPM: hibernate: Corrige un fallo al liberar un compresor criptogr\u00e1fico no v\u00e1lido\n\nCuando crypto_alloc_acomp() falla, devuelve un valor ERR_PTR, no NULL.\n\nEl c\u00f3digo de limpieza en save_compressed_image() y load_compressed_image() llama incondicionalmente a crypto_free_acomp() sin comprobar si hay ERR_PTR, lo que provoca que crypto_acomp_tfm() desreferencie un puntero no v\u00e1lido y provoque un fallo en el kernel.\n\nEsto puede activarse cuando el algoritmo de compresi\u00f3n no est\u00e1 disponible (p. ej., CONFIG_CRYPTO_LZO no habilitado).\n\nSoluci\u00f3n a\u00f1adiendo comprobaciones IS_ERR_OR_NULL() antes de llamar a crypto_free_acomp() y acomp_request_free(), similar a la comprobaci\u00f3n kthread_stop() existente.\n\n[ rjw: Added 2 empty code lines ]"}], "id": "CVE-2026-23044", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2026-02-04T16:16:19.897", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7966cf0ebe32c981bfa3db252cb5fc3bb1bf2e77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b7a883b0135dbc6817e90a829421c9fc8cd94bad"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: PM: hibernate: Fix crash when freeing invalid crypto compressor", "id": "2436800", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436800"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23044", "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": "Out of support scope", "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": "2026-02-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23044\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23044\nhttps://lore.kernel.org/linux-cve-announce/2026020439-CVE-2026-23044-3312@gregkh/T"], "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-18T14:01:21.678946+00:00", "value": {"mitigation_remediation": ["Upgrade the kernel to a release that includes the authorization fix for CVE-2026-23044", "If an upgrade is not immediately possible, disable the hibernate feature in the kernel configuration or at runtime to avoid the crash trigger", "Ensure that the required crypto compression module (e.g., CONFIG_CRYPTO_LZO) is enabled or remove the dependency from the hibernate path"], "summary": {"action": "Patch", "impact": "Kernel Crash (Denial of Service)"}, "threat_synthesis": {"affected_systems": "All Linux kernels that include the hibernate subsystem and invoke crypto_alloc_acomp during suspend or resume, regardless of distribution. Any build lacking the selected compression algorithm\u2014such as a kernel compiled without CONFIG_CRYPTO_LZO\u2014satisfies the conditions for the flaw.", "description_and_impact": "When the Linux kernel attempts to save or load a hibernate image, it may try to free a crypto compressor that was never successfully allocated if the chosen compression algorithm (e.g., LZO) is not available. The cleanup code unconditionally calls crypto_free_acomp() on an error pointer, which dereferences an invalid address and causes a kernel panic. This loss of stability results in a full system reboot and loss of all services until the machine restarts.", "risk_and_exploitability": "The entry has a CVSS score of 5.5 and an EPSS score of less than 1%, indicating moderate severity and low likelihood of known exploitation. The vulnerability is not listed in the CISA KEV catalog. The most likely attack vector is a local action that triggers a suspend or resume operation; this typically requires privileged user access or system configuration changes. Because the flaw requires kernel\u2011mode execution and local privilege, remote exploitation is not viable without additional compromises."}}}}, "created": "2026-04-18T14:15:04.105325+00:00", "updated": "2026-04-18T14:15:04.105337+00:00", "vendors": [], "weaknesses": ["CWE-416"]}