{"id":"CVE-2026-71973","state":"PUBLISHED","title":"U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation","description":"U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.","publishedAt":"2026-09-29T21:29:21.349Z","updatedAt":"2026-10-02T12:29:17.608Z","severity":{"score":5.2,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["u-boot u-boot"],"affected":[{"vendor":"u-boot","product":"u-boot","packageURL":"pkg:github/u-boot/u-boot","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2026.10-rc4","versionType":"custom"}],"repo":"https://github.com/u-boot/u-boot"}],"references":["https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b","https://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814","https://github.com/u-boot/u-boot","https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-directory-table-allocation"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71973.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71973","state":"PUBLISHED","datePublished":"2026-09-29T21:29:21.349Z","dateUpdated":"2026-10-02T12:29:17.608Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-08T16:43:04.178Z"},"containers":{"cna":{"title":"U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation","descriptions":[{"lang":"en","value":"U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader."}],"affected":[{"vendor":"u-boot","product":"u-boot","packageURL":"pkg:github/u-boot/u-boot","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2026.10-rc4","versionType":"custom"}],"repo":"https://github.com/u-boot/u-boot"}],"references":[{"url":"https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b","tags":["patch"]},{"url":"https://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814","tags":["technical-description"]},{"url":"https://github.com/u-boot/u-boot","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-directory-table-allocation","name":"VulnCheck Advisory: U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","attackVector":"PHYSICAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.2,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","attackVector":"PHYSICAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"HIGH","baseScore":5.2,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"Integer Overflow or Wraparound","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-29T21:29:21.349Z"},"datePublic":"2026-07-28T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*","versionEndExcluding":"2026.10-rc4"}]}]}],"credits":[{"lang":"en","value":"Shahriyar Jalayeri (ByteRay Ltd.)","type":"finder"},{"lang":"en","value":"Mehrun P. Hunter (ByteRay Ltd.)","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-02T12:29:06.594431Z","id":"CVE-2026-71973","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-02T12:29:17.608Z"}}]}}}