{"id":"CVE-2026-52967","state":"PUBLISHED","title":"smb/client: fix possible infinite loop and oob read in symlink_data()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix possible infinite loop and oob read in symlink_data()\n\nOn 32-bit architectures, the infinite loop is as follows:\n\n  len = p->ErrorDataLength == 0xfffffff8\n  u8 *next = p->ErrorContextData + len\n  next == p\n\nOn 32-bit architectures, the out-of-bounds read is as follows:\n\n  len = p->ErrorDataLength == 0xfffffff0\n  u8 *next = p->ErrorContextData + len\n  next == (u8 *)p - 8","publishedAt":"2026-06-24T16:28:46.661Z","updatedAt":"2026-10-19T19:47:10.711Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"1cfa2d59f669db28d6292d10ff87ca6837c781b0","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"b41598bf54b3fe528994e573df6008f8f4d0a4f4","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"1b9331b16b0ed9414dcf7583d8134bdfeb117aae","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"7d9a7f1f96cd617ee9e75bb22217c709038e26b8","versionType":"git"},{"version":"2d046892a493d9760c35fdaefc3017f27f91b621","status":"affected","versionType":"git"},{"version":"6.0.16","status":"affected","lessThan":"6.1","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2file.c"]}],"references":["https://git.kernel.org/stable/c/1cfa2d59f669db28d6292d10ff87ca6837c781b0","https://git.kernel.org/stable/c/b41598bf54b3fe528994e573df6008f8f4d0a4f4","https://git.kernel.org/stable/c/cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23","https://git.kernel.org/stable/c/97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb","https://git.kernel.org/stable/c/1b9331b16b0ed9414dcf7583d8134bdfeb117aae","https://git.kernel.org/stable/c/7d9a7f1f96cd617ee9e75bb22217c709038e26b8"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52967.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52967","state":"PUBLISHED","datePublished":"2026-06-24T16:28:46.661Z","dateUpdated":"2026-10-19T19:47:10.711Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.374Z"},"containers":{"cna":{"title":"smb/client: fix possible infinite loop and oob read in symlink_data()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix possible infinite loop and oob read in symlink_data()\n\nOn 32-bit architectures, the infinite loop is as follows:\n\n  len = p->ErrorDataLength == 0xfffffff8\n  u8 *next = p->ErrorContextData + len\n  next == p\n\nOn 32-bit architectures, the out-of-bounds read is as follows:\n\n  len = p->ErrorDataLength == 0xfffffff0\n  u8 *next = p->ErrorContextData + len\n  next == (u8 *)p - 8"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"1cfa2d59f669db28d6292d10ff87ca6837c781b0","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"b41598bf54b3fe528994e573df6008f8f4d0a4f4","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"1b9331b16b0ed9414dcf7583d8134bdfeb117aae","versionType":"git"},{"version":"76894f3e2f71177747b8b4763fb180e800279585","status":"affected","lessThan":"7d9a7f1f96cd617ee9e75bb22217c709038e26b8","versionType":"git"},{"version":"2d046892a493d9760c35fdaefc3017f27f91b621","status":"affected","versionType":"git"},{"version":"6.0.16","status":"affected","lessThan":"6.1","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.1","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2file.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1cfa2d59f669db28d6292d10ff87ca6837c781b0"},{"url":"https://git.kernel.org/stable/c/b41598bf54b3fe528994e573df6008f8f4d0a4f4"},{"url":"https://git.kernel.org/stable/c/cd4b9b662f0fb9aa97ee6bf9034eca76fc6cab23"},{"url":"https://git.kernel.org/stable/c/97a05b0ae9ea5ec052be2eef0f9cc7ce03501bbb"},{"url":"https://git.kernel.org/stable/c/1b9331b16b0ed9414dcf7583d8134bdfeb117aae"},{"url":"https://git.kernel.org/stable/c/7d9a7f1f96cd617ee9e75bb22217c709038e26b8"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable SMB client parser consumes an SMB2 CREATE error response supplied by a remote SMB server over the network. A malicious or compromised SMB share can send the crafted `STATUS_STOPPED_ON_SYMLINK` response.\nAC:L - The server directly controls `ErrorContextCount`, `ByteCount`, `ErrorId`, and `ErrorDataLength`, and no race or hard-to-hit state is required. Although the wraparound behavior is 32-bit specific, that is a deployment property rather than an attacker-uncontrolled exploitation condition.\nPR:N - The attacker needs no privileges on the victim system; they only need to operate or control the SMB server endpoint that the client connects to. The path can also be reached through guest or null-auth SMB sessions.\nUI:R - The victim client must mount/connect to the SMB share and perform a path operation such as lookup, stat, open, or create that causes an SMB2 CREATE response to be parsed. The remote server cannot trigger this parser without client-side filesystem activity.\nS:U - The affected component is the Linux kernel SMB client, and the impact is to the same kernel/client security authority. This is not a VM escape, IOMMU bypass, or cross-scope sandbox escape.\nC:H - The bug is an out-of-bounds kernel read in a server-controlled response parser, and the read is not strictly bounded to only a few harmless bytes. Following the required conservative rule, this is scored as high confidentiality impact.\nI:N - The defect advances a parser pointer incorrectly and reads from the wrong location, but it does not write out of bounds or provide a kernel memory write primitive. No direct integrity impact beyond normal malicious-server control of SMB content was identified.\nA:H - The crafted length can make the parser loop indefinitely on 32-bit systems, causing a reliable denial of service. Other malformed pointer positions can also lead to invalid kernel reads and possible oops conditions."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:32:11.748Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-52967","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T15:23:38.471326Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","type":"CWE","description":"CWE-190 Integer Overflow or Wraparound"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:47:10.711Z"}}]}}}