CVE-2026-74350

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74350", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.886Z", "datePublished": "2026-08-15T05:58:37.298Z", "dateUpdated": "2026-10-30T12:29:50.024Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:29:50.024Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate fast symlink target during inode read\n\nocfs2_validate_inode_block() already rejects several inconsistent\nself-contained dinodes before they are exposed to the rest of the\nfilesystem. Fast symlinks need the same treatment.\n\nA zero-cluster symlink is treated as a fast symlink and later read through\npage_get_link() and ocfs2_fast_symlink_read_folio(). That path uses\nstrnlen() on the inline payload and then copies len + 1 bytes into the\nfolio. If a corrupt dinode stores an i_size that does not fit the inline\narea or omits the terminating NUL at i_size, that copy reads past the end\nof the inode block buffer.\n\nReject zero-cluster symlink dinodes whose i_size exceeds the inline\nfast-symlink capacity or whose inline payload is not NUL-terminated\nexactly at i_size when the inode block is validated. This keeps malformed\nfast symlinks from reaching the read path.\n\nValidation reproduced this kernel report:\nKASAN use-after-free in ocfs2_fast_symlink_read_folio+0x12c/0x1f0\nRIP: 0033:0x7f5c6d859aa7\nRead of size 3905\nCall trace:\n dump_stack_lvl+0x66/0xa0 (?:?)\n print_report+0xce/0x630 (?:?)\n ocfs2_fast_symlink_read_folio+0x12c/0x1f0 (fs/ocfs2/inode.c:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n __virt_addr_valid+0x19f/0x330 (?:?)\n kasan_report+0xe0/0x110 (?:?)\n kasan_check_range+0x105/0x1b0 (?:?)\n __asan_memcpy+0x23/0x60 (?:?)\n filemap_read_folio+0x27/0xe0 (?:?)\n filemap_read_folio+0x35/0xe0 (?:?)\n do_read_cache_folio+0x138/0x230 (?:?)\n __page_get_link+0x26/0x110 (?:?)\n page_get_link+0x2e/0x70 (?:?)\n vfs_readlink+0x15e/0x250 (?:?)\n touch_atime+0x4d/0x370 (?:?)\n do_readlinkat+0x186/0x200 (?:?)\n do_user_addr_fault+0x65a/0x890 (?:?)\n __x64_sys_readlink+0x46/0x60 (?:?)\n do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - OCFS2 cluster nodes commonly NFS-export shared LUNs; nfsd READLINK reaches vfs_readlink\u2192page_get_link\u2192ocfs2_fast_symlink_read_folio on a forged zero-cluster symlink dinode on the volume, giving a remote network attack path without a local syscall.\nAC:L - A forged dinode fully controls i_size and inline bytes; strnlen() bounded only by ocfs2_fast_symlink_chars() then memcpy_to_folio() copies len+1 past the inode buffer_head (KASAN read ~3905), deterministically and without races.\nPR:N - Triggering needs only permission to read the symlink: a remote NFS client on an exported share, or any unprivileged local/cluster user; planting the malformed dinode uses attacker-controlled on-disk metadata on shared storage, not init-namespace root on the victim.\nUI:N - Once the corrupt fast symlink exists on a mounted/exported volume, readlink(2), NFS READLINK, or path lookup via get_link automatically pulls the inline target through ocfs2_fast_symlink_read_folio with no further deliberate victim action.\nS:U - Impact stays within the host kernel parsing the OCFS2 symlink (memory disclosure/crash/privilege escalation on the server); no VM escape, IOMMU bypass, or cross-authority scope change.\nC:H - memcpy_to_folio() performs an out-of-bounds read up to ~3900 bytes past the inode block buffer (KASAN UAF/slab read of size 3905); OOB/UAF kernel reads enable arbitrary adjacent-heap disclosure.\nI:H - The same unvalidated strnlen/memcpy path corrupts kernel memory semantics (KASAN UAF) and, per kernel CNA guidance, UAF/OOB reads adjacent slab objects can be leveraged into write/control-flow primitives via heap grooming.\nA:H - KASAN reports use-after-free in ocfs2_fast_symlink_read_folio during the over-wide memcpy; such kernel memory faults typically oops/panic the host, fully denying availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/inode.c"], "versions": [{"version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "lessThan": "ed9f95ee3bbaea9b05808727eb86ea5e5ccf2b52", "status": "affected", "versionType": "git"}, {"version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "lessThan": "dcabbf7da43825e23e5e89adccc1430faee1bce1", "status": "affected", "versionType": "git"}, {"version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "lessThan": "030d4caae89977b80349df95523dfda1dfb10f73", "status": "affected", "versionType": "git"}, {"version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "lessThan": "d94bf50756d7f80bb728ad58246376649e1035b6", "status": "affected", "versionType": "git"}, {"version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "lessThan": "f9e2cb692b77a679b1f4cc2b7b277fa908586533", "status": "affected", "versionType": "git"}, {"version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "lessThan": "e234973f286ed2e8961a24561ec91594ec3e3ff8", "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/ocfs2/inode.c"], "versions": [{"version": "3.5", "status": "affected"}, {"version": "0", "lessThan": "3.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "3.5", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ed9f95ee3bbaea9b05808727eb86ea5e5ccf2b52"}, {"url": "https://git.kernel.org/stable/c/dcabbf7da43825e23e5e89adccc1430faee1bce1"}, {"url": "https://git.kernel.org/stable/c/030d4caae89977b80349df95523dfda1dfb10f73"}, {"url": "https://git.kernel.org/stable/c/d94bf50756d7f80bb728ad58246376649e1035b6"}, {"url": "https://git.kernel.org/stable/c/f9e2cb692b77a679b1f4cc2b7b277fa908586533"}, {"url": "https://git.kernel.org/stable/c/e234973f286ed2e8961a24561ec91594ec3e3ff8"}], "title": "ocfs2: validate fast symlink target during inode read", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ocfs2/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ed9f95ee3bbaea9b05808727eb86ea5e5ccf2b52", "status": "affected", "version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "versionType": "git"}, {"lessThan": "dcabbf7da43825e23e5e89adccc1430faee1bce1", "status": "affected", "version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "versionType": "git"}, {"lessThan": "030d4caae89977b80349df95523dfda1dfb10f73", "status": "affected", "version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "versionType": "git"}, {"lessThan": "d94bf50756d7f80bb728ad58246376649e1035b6", "status": "affected", "version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "versionType": "git"}, {"lessThan": "f9e2cb692b77a679b1f4cc2b7b277fa908586533", "status": "affected", "version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "versionType": "git"}, {"lessThan": "e234973f286ed2e8961a24561ec91594ec3e3ff8", "status": "affected", "version": "ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ocfs2/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.5"}, {"lessThan": "3.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate fast symlink target during inode read\n\nocfs2_validate_inode_block() already rejects several inconsistent\nself-contained dinodes before they are exposed to the rest of the\nfilesystem. Fast symlinks need the same treatment.\n\nA zero-cluster symlink is treated as a fast symlink and later read through\npage_get_link() and ocfs2_fast_symlink_read_folio(). That path uses\nstrnlen() on the inline payload and then copies len + 1 bytes into the\nfolio. If a corrupt dinode stores an i_size that does not fit the inline\narea or omits the terminating NUL at i_size, that copy reads past the end\nof the inode block buffer.\n\nReject zero-cluster symlink dinodes whose i_size exceeds the inline\nfast-symlink capacity or whose inline payload is not NUL-terminated\nexactly at i_size when the inode block is validated. This keeps malformed\nfast symlinks from reaching the read path.\n\nValidation reproduced this kernel report:\nKASAN use-after-free in ocfs2_fast_symlink_read_folio+0x12c/0x1f0\nRIP: 0033:0x7f5c6d859aa7\nRead of size 3905\nCall trace:\n dump_stack_lvl+0x66/0xa0 (?:?)\n print_report+0xce/0x630 (?:?)\n ocfs2_fast_symlink_read_folio+0x12c/0x1f0 (fs/ocfs2/inode.c:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n __virt_addr_valid+0x19f/0x330 (?:?)\n kasan_report+0xe0/0x110 (?:?)\n kasan_check_range+0x105/0x1b0 (?:?)\n __asan_memcpy+0x23/0x60 (?:?)\n filemap_read_folio+0x27/0xe0 (?:?)\n filemap_read_folio+0x35/0xe0 (?:?)\n do_read_cache_folio+0x138/0x230 (?:?)\n __page_get_link+0x26/0x110 (?:?)\n page_get_link+0x2e/0x70 (?:?)\n vfs_readlink+0x15e/0x250 (?:?)\n touch_atime+0x4d/0x370 (?:?)\n do_readlinkat+0x186/0x200 (?:?)\n do_user_addr_fault+0x65a/0x890 (?:?)\n __x64_sys_readlink+0x46/0x60 (?:?)\n do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)"}], "id": "CVE-2026-74350", "lastModified": "2026-10-30T13:19:55.933", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:36.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/030d4caae89977b80349df95523dfda1dfb10f73"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d94bf50756d7f80bb728ad58246376649e1035b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dcabbf7da43825e23e5e89adccc1430faee1bce1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e234973f286ed2e8961a24561ec91594ec3e3ff8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ed9f95ee3bbaea9b05808727eb86ea5e5ccf2b52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f9e2cb692b77a679b1f4cc2b7b277fa908586533"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ocfs2: validate fast symlink target during inode read", "id": "2516899", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516899"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nocfs2: validate fast symlink target during inode read\nocfs2_validate_inode_block() already rejects several inconsistent\nself-contained dinodes before they are exposed to the rest of the\nfilesystem. Fast symlinks need the same treatment.\nA zero-cluster symlink is treated as a fast symlink and later read through\npage_get_link() and ocfs2_fast_symlink_read_folio(). That path uses\nstrnlen() on the inline payload and then copies len + 1 bytes into the\nfolio. If a corrupt dinode stores an i_size that does not fit the inline\narea or omits the terminating NUL at i_size, that copy reads past the end\nof the inode block buffer.\nReject zero-cluster symlink dinodes whose i_size exceeds the inline\nfast-symlink capacity or whose inline payload is not NUL-terminated\nexactly at i_size when the inode block is validated. This keeps malformed\nfast symlinks from reaching the read path.\nValidation reproduced this kernel report:\nKASAN use-after-free in ocfs2_fast_symlink_read_folio+0x12c/0x1f0\nRIP: 0033:0x7f5c6d859aa7\nRead of size 3905\nCall trace:\ndump_stack_lvl+0x66/0xa0 (?:?)\nprint_report+0xce/0x630 (?:?)\nocfs2_fast_symlink_read_folio+0x12c/0x1f0 (fs/ocfs2/inode.c:?)\nsrso_alias_return_thunk+0x5/0xfbef5 (?:?)\n__virt_addr_valid+0x19f/0x330 (?:?)\nkasan_report+0xe0/0x110 (?:?)\nkasan_check_range+0x105/0x1b0 (?:?)\n__asan_memcpy+0x23/0x60 (?:?)\nfilemap_read_folio+0x27/0xe0 (?:?)\nfilemap_read_folio+0x35/0xe0 (?:?)\ndo_read_cache_folio+0x138/0x230 (?:?)\n__page_get_link+0x26/0x110 (?:?)\npage_get_link+0x2e/0x70 (?:?)\nvfs_readlink+0x15e/0x250 (?:?)\ntouch_atime+0x4d/0x370 (?:?)\ndo_readlinkat+0x186/0x200 (?:?)\ndo_user_addr_fault+0x65a/0x890 (?:?)\n__x64_sys_readlink+0x46/0x60 (?:?)\ndo_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\nentry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)", "A flaw was found in ocfs2, the Oracle Cluster File System version 2. A local attacker could create a specially crafted fast symbolic link (symlink) with an incorrect inode size or a missing null character terminator. When the kernel attempts to read this malformed symlink, it can read beyond the allocated buffer, leading to a use-after-free vulnerability. This memory corruption could allow a local attacker to cause a denial of service or potentially achieve arbitrary code execution."], "name": "CVE-2026-74350", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74350\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74350\nhttps://lore.kernel.org/linux-cve-announce/2026081559-CVE-2026-74350-2678@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1,f9e2cb692b77a679b1f4cc2b7b277fa908586533)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1,e234973f286ed2e8961a24561ec91594ec3e3ff8)"}}], "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": "3.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T13:00:05.628135+00:00", "updated": "2026-08-22T03:00:12.236201+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}