CVE-2026-53165

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53165", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.389Z", "datePublished": "2026-06-25T08:38:45.445Z", "dateUpdated": "2026-08-05T12:33:38.251Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:38.251Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: avoid potential null folio->mapping deref during error reporting\n\nWhen a buffered read fails, iomap_finish_folio_read() reports the error\nwith fserror_report_io(folio->mapping->host, ...). This is called after\nifs->read_bytes_pending has been decremented by the bytes attempted to\nbe read.\n\nFor a folio split across multiple read completions, the folio is only\nguaranteed to stay locked while read_bytes_pending > 0. Once\niomap_finish_folio_read() decrements read_bytes_pending, another\nin-flight read can complete and end the read on the folio, which unlocks\nit. This allows truncate logic to run and detach the folio (set\nfolio->mapping to NULL). The error reporting path then can dereference a\nNULL folio->mapping. As reported by Sam Sun, this is the race that can\noccur:\n\nCPU0: failed completion CPU1: final completion CPU2: truncate\n----------------------- ---------------------- --------------\nread_bytes_pending -= len\nfinished = false\n/* preempted before\n fserror_report_io() */\n\t\t\t read_bytes_pending -= len\n\t\t\t finished = true\n\t\t\t folio_end_read()\n\t\t\t\t\t\t\ttruncate clears\n\t\t\t\t\t\t\tfolio->mapping\nfserror_report_io(\n folio->mapping->host, ...)\n\t ^ NULL deref\n\nFix this by reporting the error first before decrementing\nifs->read_bytes_pending."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - Remote file-serving paths such as ksmbd and nfsd can drive VFS reads and truncates on iomap-backed filesystems, reaching the vulnerable completion path through network requests. A local syscall path also exists, but the highest reasonable exposure is a writable network share/export.\nAC:L - The bug is a race, but an attacker can issue concurrent read/readahead and truncate or size-change operations and retry the window. There is no memory-layout prerequisite, and uncertainty is resolved toward the higher-severity AC:L.\nPR:N - A writable anonymous or guest SMB/NFS export can expose the read and truncate operations without prior authentication. If the export requires credentials this would be PR:L, but the highest reasonable deployment is unauthenticated access.\nUI:N - The attacker can trigger both the read/error-reporting side and the truncate side directly through requests. No separate victim action is required.\nS:U - The fault occurs within the kernel filesystem/page-cache security authority. It does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The vulnerable dereference is a NULL folio->mapping dereference during error reporting. This is a crash condition, not an information disclosure primitive.\nI:N - The bug does not corrupt attacker-controlled memory or provide a write primitive. It only dereferences a NULL mapping pointer.\nA:H - A NULL pointer dereference in kernel context can oops or panic the system. Repeated triggering can deny availability of the affected host."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/iomap/buffered-io.c"], "versions": [{"version": "a9d573ee88af980f14fdadb5c12bbf6a195fb3f1", "lessThan": "1ad453817a4077230d1ba88eb0868f05f824449a", "status": "affected", "versionType": "git"}, {"version": "a9d573ee88af980f14fdadb5c12bbf6a195fb3f1", "lessThan": "2eea7f44b9c8b42fd7d3a1a87c06a7cd1b99c327", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/iomap/buffered-io.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "7.0", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1ad453817a4077230d1ba88eb0868f05f824449a"}, {"url": "https://git.kernel.org/stable/c/2eea7f44b9c8b42fd7d3a1a87c06a7cd1b99c327"}], "title": "iomap: avoid potential null folio->mapping deref during error reporting", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/iomap/buffered-io.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1ad453817a4077230d1ba88eb0868f05f824449a", "status": "affected", "version": "a9d573ee88af980f14fdadb5c12bbf6a195fb3f1", "versionType": "git"}, {"lessThan": "2eea7f44b9c8b42fd7d3a1a87c06a7cd1b99c327", "status": "affected", "version": "a9d573ee88af980f14fdadb5c12bbf6a195fb3f1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/iomap/buffered-io.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A6A85CDC-815A-4808-8C81-4703E7947CC5", "versionEndExcluding": "7.0.13", "versionStartIncluding": "7.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: avoid potential null folio->mapping deref during error reporting\n\nWhen a buffered read fails, iomap_finish_folio_read() reports the error\nwith fserror_report_io(folio->mapping->host, ...). This is called after\nifs->read_bytes_pending has been decremented by the bytes attempted to\nbe read.\n\nFor a folio split across multiple read completions, the folio is only\nguaranteed to stay locked while read_bytes_pending > 0. Once\niomap_finish_folio_read() decrements read_bytes_pending, another\nin-flight read can complete and end the read on the folio, which unlocks\nit. This allows truncate logic to run and detach the folio (set\nfolio->mapping to NULL). The error reporting path then can dereference a\nNULL folio->mapping. As reported by Sam Sun, this is the race that can\noccur:\n\nCPU0: failed completion CPU1: final completion CPU2: truncate\n----------------------- ---------------------- --------------\nread_bytes_pending -= len\nfinished = false\n/* preempted before\n fserror_report_io() */\n\t\t\t read_bytes_pending -= len\n\t\t\t finished = true\n\t\t\t folio_end_read()\n\t\t\t\t\t\t\ttruncate clears\n\t\t\t\t\t\t\tfolio->mapping\nfserror_report_io(\n folio->mapping->host, ...)\n\t ^ NULL deref\n\nFix this by reporting the error first before decrementing\nifs->read_bytes_pending."}], "id": "CVE-2026-53165", "lastModified": "2026-07-07T18:14:02.510", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-06-25T09:16:33.893", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1ad453817a4077230d1ba88eb0868f05f824449a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2eea7f44b9c8b42fd7d3a1a87c06a7cd1b99c327"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iomap: avoid potential null folio->mapping deref during error reporting", "id": "2492726", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492726"}, "csaw": false, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's `iomap` subsystem. A race condition can occur during buffered read error reporting, specifically in the `iomap_finish_folio_read()` function. This allows a separate process to clear a folio's mapping while an error is being reported, leading to a null pointer dereference. This vulnerability can result in a system crash, causing a Denial of Service (DoS)."], "name": "CVE-2026-53165", "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": "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": "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": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53165\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53165\nhttps://lore.kernel.org/linux-cve-announce/2026062550-CVE-2026-53165-7592@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a9d573ee88af980f14fdadb5c12bbf6a195fb3f1,1ad453817a4077230d1ba88eb0868f05f824449a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a9d573ee88af980f14fdadb5c12bbf6a195fb3f1,2eea7f44b9c8b42fd7d3a1a87c06a7cd1b99c327)"}}], "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": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-06-25T12:15:03.848498+00:00", "updated": "2026-06-28T14:30:07.104754+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}