CVE-2026-23052

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23052", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.950Z", "datePublished": "2026-02-04T16:04:21.739Z", "dateUpdated": "2026-07-04T11:50:25.608Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-04T11:50:25.608Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Do not over-allocate ftrace memory\n\nThe pg_remaining calculation in ftrace_process_locs() assumes that\nENTRIES_PER_PAGE multiplied by 2^order equals the actual capacity of the\nallocated page group. However, ENTRIES_PER_PAGE is PAGE_SIZE / ENTRY_SIZE\n(integer division). When PAGE_SIZE is not a multiple of ENTRY_SIZE (e.g.\n4096 / 24 = 170 with remainder 16), high-order allocations (like 256 pages)\nhave significantly more capacity than 256 * 170. This leads to pg_remaining\nbeing underestimated, which in turn makes skip (derived from skipped -\npg_remaining) larger than expected, causing the WARN(skip != remaining)\nto trigger.\n\nExtra allocated pages for ftrace: 2 with 654 skipped\nWARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7295 ftrace_process_locs+0x5bf/0x5e0\n\nA similar problem in ftrace_allocate_records() can result in allocating\ntoo many pages. This can trigger the second warning in\nftrace_process_locs().\n\nExtra allocated pages for ftrace\nWARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7276 ftrace_process_locs+0x548/0x580\n\nUse the actual capacity of a page group to determine the number of pages\nto allocate. Have ftrace_allocate_pages() return the number of allocated\npages to avoid having to calculate it. Use the actual page group capacity\nwhen validating the number of unused pages due to skipped entries.\nDrop the definition of ENTRIES_PER_PAGE since it is no longer used."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/ftrace.c"], "versions": [{"version": "dc06779d338de4e5a46166a93ec124222e09f40a", "lessThan": "bf802b936a7b269917e4dc233e49f6a928db8286", "status": "affected", "versionType": "git"}, {"version": "2a6ce8bddd8aafa61aaa705e76eae810f22429be", "lessThan": "23936d19e4383c8dfb03931f032473d4baf92533", "status": "affected", "versionType": "git"}, {"version": "4a3efc6baff931da9a85c6d2e42c87bd9a827399", "lessThan": "9aef476717994e96dadfb359641c4b82b521aa36", "status": "affected", "versionType": "git"}, {"version": "4a3efc6baff931da9a85c6d2e42c87bd9a827399", "lessThan": "be55257fab181b93af38f8c4b1b3cb453a78d742", "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/trace/ftrace.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.7", "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": "6.18.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/bf802b936a7b269917e4dc233e49f6a928db8286"}, {"url": "https://git.kernel.org/stable/c/23936d19e4383c8dfb03931f032473d4baf92533"}, {"url": "https://git.kernel.org/stable/c/9aef476717994e96dadfb359641c4b82b521aa36"}, {"url": "https://git.kernel.org/stable/c/be55257fab181b93af38f8c4b1b3cb453a78d742"}], "title": "ftrace: Do not over-allocate ftrace memory", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/ftrace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "bf802b936a7b269917e4dc233e49f6a928db8286", "status": "affected", "version": "dc06779d338de4e5a46166a93ec124222e09f40a", "versionType": "git"}, {"lessThan": "23936d19e4383c8dfb03931f032473d4baf92533", "status": "affected", "version": "2a6ce8bddd8aafa61aaa705e76eae810f22429be", "versionType": "git"}, {"lessThan": "9aef476717994e96dadfb359641c4b82b521aa36", "status": "affected", "version": "4a3efc6baff931da9a85c6d2e42c87bd9a827399", "versionType": "git"}, {"lessThan": "be55257fab181b93af38f8c4b1b3cb453a78d742", "status": "affected", "version": "4a3efc6baff931da9a85c6d2e42c87bd9a827399", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/ftrace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.19", "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\nftrace: Do not over-allocate ftrace memory\n\nThe pg_remaining calculation in ftrace_process_locs() assumes that\nENTRIES_PER_PAGE multiplied by 2^order equals the actual capacity of the\nallocated page group. However, ENTRIES_PER_PAGE is PAGE_SIZE / ENTRY_SIZE\n(integer division). When PAGE_SIZE is not a multiple of ENTRY_SIZE (e.g.\n4096 / 24 = 170 with remainder 16), high-order allocations (like 256 pages)\nhave significantly more capacity than 256 * 170. This leads to pg_remaining\nbeing underestimated, which in turn makes skip (derived from skipped -\npg_remaining) larger than expected, causing the WARN(skip != remaining)\nto trigger.\n\nExtra allocated pages for ftrace: 2 with 654 skipped\nWARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7295 ftrace_process_locs+0x5bf/0x5e0\n\nA similar problem in ftrace_allocate_records() can result in allocating\ntoo many pages. This can trigger the second warning in\nftrace_process_locs().\n\nExtra allocated pages for ftrace\nWARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7276 ftrace_process_locs+0x548/0x580\n\nUse the actual capacity of a page group to determine the number of pages\nto allocate. Have ftrace_allocate_pages() return the number of allocated\npages to avoid having to calculate it. Use the actual page group capacity\nwhen validating the number of unused pages due to skipped entries.\nDrop the definition of ENTRIES_PER_PAGE since it is no longer used."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nftrace: No sobreasignar memoria de ftrace\n\nEl c\u00e1lculo de pg_remaining en ftrace_process_locs() asume que ENTRIES_PER_PAGE multiplicado por 2^order es igual a la capacidad real del grupo de p\u00e1ginas asignado. Sin embargo, ENTRIES_PER_PAGE es PAGE_SIZE / ENTRY_SIZE (divisi\u00f3n entera). Cuando PAGE_SIZE no es un m\u00faltiplo de ENTRY_SIZE (por ejemplo, 4096 / 24 = 170 con resto 16), las asignaciones de orden superior (como 256 p\u00e1ginas) tienen significativamente m\u00e1s capacidad que 256 * 170. Esto lleva a que pg_remaining sea subestimado, lo que a su vez hace que skip (derivado de skipped - pg_remaining) sea mayor de lo esperado, lo que provoca que se active el WARN(skip != remaining).\n\nP\u00e1ginas extra asignadas para ftrace: 2 con 654 omitidas\nADVERTENCIA: CPU: 0 PID: 0 en kernel/trace/ftrace.c:7295 ftrace_process_locs+0x5bf/0x5e0\n\nUn problema similar en ftrace_allocate_records() puede resultar en la asignaci\u00f3n de demasiadas p\u00e1ginas. Esto puede activar la segunda advertencia en ftrace_process_locs().\n\nP\u00e1ginas extra asignadas para ftrace\nADVERTENCIA: CPU: 0 PID: 0 en kernel/trace/ftrace.c:7276 ftrace_process_locs+0x548/0x580\n\nUtilice la capacidad real de un grupo de p\u00e1ginas para determinar el n\u00famero de p\u00e1ginas a asignar. Haga que ftrace_allocate_pages() devuelva el n\u00famero de p\u00e1ginas asignadas para evitar tener que calcularlo. Utilice la capacidad real del grupo de p\u00e1ginas al validar el n\u00famero de p\u00e1ginas no utilizadas debido a entradas omitidas. Elimine la definici\u00f3n de ENTRIES_PER_PAGE ya que ya no se utiliza."}], "id": "CVE-2026-23052", "lastModified": "2026-07-04T12:16:54.070", "metrics": {}, "published": "2026-02-04T17:16:15.867", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/23936d19e4383c8dfb03931f032473d4baf92533"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9aef476717994e96dadfb359641c4b82b521aa36"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be55257fab181b93af38f8c4b1b3cb453a78d742"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bf802b936a7b269917e4dc233e49f6a928db8286"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: ftrace: Do not over-allocate ftrace memory", "id": "2436762", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436762"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23052", "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-2026-23052\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23052\nhttps://lore.kernel.org/linux-cve-announce/2026020450-CVE-2026-23052-340f@gregkh/T"], "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-18T18:30:50.781893+00:00", "value": {"mitigation_remediation": ["Update the running Linux kernel to a version that contains the ftrace allocation fix.", "Reboot the system to load the updated kernel.", "If an update cannot be performed immediately, consider disabling ftrace or reducing its buffer size (for example, set ftrace buffer limits to minimal values) to prevent excessive page allocation while the patch is pending."], "summary": {"action": "Apply Patch", "impact": "Denial of Service via excessive memory allocation"}, "threat_synthesis": {"affected_systems": "The vulnerability applies to all Linux kernel releases prior to the upstream commit that fixed the ftrace calculation logic. Specific affected version ranges are not listed in the advisory; however, any kernel before the patch, regardless of distribution, is potentially impacted. The advisory references the Linux:Linux vendor with no version restrictions.", "description_and_impact": "A bug in the Linux kernel\u2019s ftrace subsystem miscalculates the capacity of allocated page groups, causing the system to underestimate available pages. This misestimation leads to over\u2011allocating memory for trace records, which in turn triggers warning messages indicating a mismatch between expected and remaining pages. While the bug does not directly corrupt memory, the excessive allocation can consume more RAM than intended, potentially destabilizing the system or exhausting available memory, thereby impacting availability. The weakness corresponds to excessive resource allocation, as defined by CWE\u2011469.", "risk_and_exploitability": "The CVSS score of 7.0 indicates a high severity, yet the EPSS score is reported as less than 1%, suggesting that active exploitation is unlikely at this time. The bug is not listed in the CISA KEV catalog, further reducing the immediate threat. Attackers would need privileged access to enable or manipulate ftrace at kernel level to trigger the over\u2011allocation. Based on the description, it is inferred that the likely attack vector is local and requires superuser privileges. Because the symptoms manifest mainly as kernel warnings rather than an untrusted input exploit, the risk is high but the actual exploitation window is limited."}}}}, "created": "2026-04-18T18:45:05.744827+00:00", "updated": "2026-04-18T18:45:05.744839+00:00", "vendors": [], "weaknesses": ["CWE-469"]}