CVE-2026-53343

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With CONFIG_KASAN_VMALLOC and\nCONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to()\nwith an alignment exception before reaching init.\n\nUse ldrb for the dummy shadow access. The code only needs to fault in the\nshadow mapping if the stack shadow is missing, so a byte load is sufficient\nand matches the granularity of KASAN shadow memory."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm/kernel/entry-armv.S"], "versions": [{"version": "8fe148d39c127de3fb78dfa6da95a3608dfda454", "lessThan": "c0b8c148a7754826156993ed6442d31536ec86b4", "status": "affected", "versionType": "git"}, {"version": "ef21187c0672a2b2cbec44f33bab9ec47d5c277c", "lessThan": "c2e3aadc8fef7da068490597fc5582f8f362aeb2", "status": "affected", "versionType": "git"}, {"version": "c86d26b4b089ca294b3b7d915a7da61edb77935f", "lessThan": "c74990828d3c486ee44aaa68240eb3abff289d1c", "status": "affected", "versionType": "git"}, {"version": "44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2", "lessThan": "517720913bd3c17a52cd55a740064f68455ab88e", "status": "affected", "versionType": "git"}, {"version": "44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2", "lessThan": "2a4dc9a0ac3326e79fb58fdaae724b92127709a9", "status": "affected", "versionType": "git"}, {"version": "44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2", "lessThan": "77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6", "status": "affected", "versionType": "git"}, {"version": "6.1.120", "lessThan": "6.1.176", "status": "affected", "versionType": "semver"}, {"version": "6.6.64", "lessThan": "6.6.143", "status": "affected", "versionType": "semver"}, {"version": "6.12.4", "lessThan": "6.12.94", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm/kernel/entry-armv.S"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "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": "6.1.120", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.64", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.4", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4"}, {"url": "https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2"}, {"url": "https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c"}, {"url": "https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e"}, {"url": "https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9"}, {"url": "https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6"}], "title": "ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow", "x_generator": {"engine": "bippy-1.2.0"}}}}

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The read uses ldr, but the KASAN shadow address is\nbyte-granular and is not guaranteed to be word aligned.\n\nARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and\nCONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to()\nwith an alignment exception before reaching init.\n\nUse ldrb for the dummy shadow access. The code only needs to fault in the\nshadow mapping if the stack shadow is missing, so a byte load is sufficient\nand matches the granularity of KASAN shadow memory."}], "id": "CVE-2026-53343", "lastModified": "2026-07-23T21:32:28.700", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-07-01T14:16:42.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow", "id": "2495933", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495933"}, "csaw": false, "cwe": "CWE-468", "details": ["A flaw was found in the Linux kernel. On ARMv5 systems configured with Kernel Address Sanitizer (KASAN) for virtual memory allocated (VMAP) stack shadow, a memory access operation could attempt to read data from an unaligned memory address. This unaligned access leads to an alignment exception, causing the system to crash. This vulnerability results in a Denial of Service (DoS) for affected systems."], "name": "CVE-2026-53343", "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": "2026-07-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53343\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53343\nhttps://lore.kernel.org/linux-cve-announce/2026070144-CVE-2026-53343-e76a@gregkh/T"]}

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