{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49058", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.243Z", "datePublished": "2025-02-26T01:54:29.195Z", "dateUpdated": "2026-08-05T08:53:40.101Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:40.101Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: potential buffer overflow in handling symlinks\n\nSmatch printed a warning:\n\tarch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error:\n\t__memcpy() 'dctx->buf' too small (16 vs u32max)\n\nIt's caused because Smatch marks 'link_len' as untrusted since it comes\nfrom sscanf(). Add a check to ensure that 'link_len' is not larger than\nthe size of the 'link_str' buffer." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The attacker-controlled MF symlink payload is delivered over SMB as remote file contents and parsed in the CIFS client (query_mf_symlink/check_mf_symlink → parse_mf_symlink), so a malicious or compromised file server triggers the bug across the network.\nAC:L - A crafted 1067-byte MF symlink with an sscanf-derived link_len above 1024 (up to 9999 via %04u) deterministically drives crypto_shash_update/kstrndup past the in-buffer link_str; no race or layout luck is required.\nPR:N - The attacker only needs to operate or impersonate the SMB endpoint; no credentials or privileges on the victim client are required for the server to return the malicious object.\nUI:N - In the worst reasonable deployment (cifsroot defaults include mfsymlinks; fstab/autofs/container shares), ordinary client lookup/revalidate/get_link activity on an already-mounted share parses the planted object with no exploit-time victim action.\nS:U - The heap over-read and any resulting oops stay within the host kernel CIFS client authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - parse_mf_symlink feeds an attacker-chosen link_len into hashing/string duplication over link_str, over-reading up to ~9KB past the kmalloc object; that is a large OOB read and can surface heap bytes via kstrndup if the MD5 check is satisfied.\nI:N - The defect is an out-of-bounds read of server-supplied symlink bytes into MD5/kstrndup paths, not an out-of-bounds write or control-flow corruption primitive, matching other SMB client OOB-read symlink parses.\nA:H - Reading thousands of bytes past a 1067-byte allocation can fault unmapped heap and oops the kernel, and a malicious server can trigger the malformed object repeatedly on path access." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/cifs/link.c" ], "versions": [ { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "3e582749e742e662a8e9bb37cffac62dccaaa1e2", "status": "affected", "versionType": "git" }, { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "1316c28569a80ab3596eeab05bf5e01991e7e739", "status": "affected", "versionType": "git" }, { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "eb5f51756944735ac70cd8bb38637cc202e29c91", "status": "affected", "versionType": "git" }, { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "22d658c6c5affed10c8907e67160cef0b6c92186", "status": "affected", "versionType": "git" }, { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "4e166a41180be2f1e66bbb6d46448e80a9a5ec05", "status": "affected", "versionType": "git" }, { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "9901b07ba42b39266b34a888e48d7306fd707bee", "status": "affected", "versionType": "git" }, { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "515e7ba11ef043d6febe69389949c8ef5f25e9d0", "status": "affected", "versionType": "git" }, { "version": "c69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131", "lessThan": "64c4a37ac04eeb43c42d272f6e6c8c12bfcf4304", "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/cifs/link.c" ], "versions": [ { "version": "2.6.37", "status": "affected" }, { "version": "0", "lessThan": "2.6.37", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.311", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.276", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.239", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.190", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.112", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.35", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.4", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18", "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": "2.6.37", "versionEndExcluding": "4.9.311" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "4.14.276" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "4.19.239" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.4.190" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.10.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.15.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.17.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3e582749e742e662a8e9bb37cffac62dccaaa1e2" }, { "url": "https://git.kernel.org/stable/c/1316c28569a80ab3596eeab05bf5e01991e7e739" }, { "url": "https://git.kernel.org/stable/c/eb5f51756944735ac70cd8bb38637cc202e29c91" }, { "url": "https://git.kernel.org/stable/c/22d658c6c5affed10c8907e67160cef0b6c92186" }, { "url": "https://git.kernel.org/stable/c/4e166a41180be2f1e66bbb6d46448e80a9a5ec05" }, { "url": "https://git.kernel.org/stable/c/9901b07ba42b39266b34a888e48d7306fd707bee" }, { "url": "https://git.kernel.org/stable/c/515e7ba11ef043d6febe69389949c8ef5f25e9d0" }, { "url": "https://git.kernel.org/stable/c/64c4a37ac04eeb43c42d272f6e6c8c12bfcf4304" } ], "title": "cifs: potential buffer overflow in handling symlinks", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49058", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-10-01T19:50:01.997451Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-120", "description": "CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:57:06.701Z" } } ] } }