{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53041", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.380Z", "datePublished": "2026-06-24T16:29:47.501Z", "dateUpdated": "2026-08-05T12:32:49.657Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:49.657Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix listxattr handling when the buffer is full\n\n[BUG]\nIf an OCFS2 inode has both inline and block-based xattrs, listxattr()\ncan return a size larger than the caller's buffer when the inline names\nconsume that buffer exactly.\n\nkernel BUG at mm/usercopy.c:102!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:usercopy_abort+0xb7/0xd0 mm/usercopy.c:102\nCall Trace:\n __check_heap_object+0xe3/0x120 mm/slub.c:8243\n check_heap_object mm/usercopy.c:196 [inline]\n __check_object_size mm/usercopy.c:250 [inline]\n __check_object_size+0x5c5/0x780 mm/usercopy.c:215\n check_object_size include/linux/ucopysize.h:22 [inline]\n check_copy_size include/linux/ucopysize.h:59 [inline]\n copy_to_user include/linux/uaccess.h:219 [inline]\n listxattr+0xb0/0x170 fs/xattr.c:926\n filename_listxattr fs/xattr.c:958 [inline]\n path_listxattrat+0x137/0x320 fs/xattr.c:988\n __do_sys_listxattr fs/xattr.c:1001 [inline]\n __se_sys_listxattr fs/xattr.c:998 [inline]\n __x64_sys_listxattr+0x7f/0xd0 fs/xattr.c:998\n ...\n\n[CAUSE]\nCommit 936b8834366e (\"ocfs2: Refactor xattr list and remove\nocfs2_xattr_handler().\") replaced the old per-handler list accounting\nwith ocfs2_xattr_list_entry(), but it kept using size == 0 to detect\nprobe mode.\n\nThat assumption stops being true once ocfs2_listxattr() finishes the\ninline-xattr pass. If the inline names fill the caller buffer exactly,\nthe block-xattr pass runs with a non-NULL buffer and a remaining size of\nzero. ocfs2_xattr_list_entry() then skips the bounds check, keeps\ncounting block names, and returns a positive size larger than the\nsupplied buffer.\n\n[FIX]\nDetect probe mode by testing whether the destination buffer pointer is\nNULL instead of whether the remaining size is zero.\n\nThat restores the pre-refactor behavior and matches the OCFS2 getxattr\nhelpers. Once the remaining buffer reaches zero while more names are\nleft, the block-xattr pass now returns -ERANGE instead of reporting a\nsize larger than the allocated list buffer." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable OCFS2 code is reached through local `listxattr`/`llistxattr`/`flistxattr`/`listxattrat` syscalls where the caller controls the too-small buffer size. Network wrappers such as nfsd and ksmbd probe and allocate the full xattr-list size, so they do not expose the short-buffer trigger.\nAC:L - The attacker can deterministically create the needed inline-plus-block xattr layout on a writable OCFS2 file using `user.*` xattrs, then pass a buffer size that exactly fits the inline names. No race or external timing condition is required.\nPR:L - A basic local unprivileged user with access to a writable OCFS2 file or directory can create `user.*` xattrs and invoke `listxattr`. Creating/mounting the filesystem may require administrator setup, but exploitation on an affected deployed system does not require real root.\nUI:N - Once the attacker has local access to the OCFS2 path, exploitation is performed directly with syscalls. No separate victim action is needed.\nS:U - The issue affects kernel filesystem handling within the same host security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug returns a length larger than the allocated kernel xattr-list buffer, causing `copy_to_user` to attempt an out-of-bounds kernel heap read. With hardened usercopy this aborts, but without it or under weaker checking this can expose kernel memory, so confidentiality is high.\nI:N - The flaw is an oversized read/copy length and does not write beyond bounds or corrupt kernel objects. It does not provide a direct integrity modification primitive.\nA:H - On hardened-usercopy kernels the overlong `copy_to_user` triggers `usercopy_abort()` and `BUG()`, producing a kernel oops/panic. The crash is repeatable by the local attacker." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ocfs2/xattr.c" ], "versions": [ { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "a35a1c2b170b5b578b1b3fecb95694796552af9a", "status": "affected", "versionType": "git" }, { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "2323084c17370304f49c84b354fe7b3edbb264fe", "status": "affected", "versionType": "git" }, { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "6f702b00b8124c5d3525f19172934544826a114d", "status": "affected", "versionType": "git" }, { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "d919b905939eda93393e3572900ff70dbad2b47f", "status": "affected", "versionType": "git" }, { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "46e66fefb83811958127bc9ad736983ec629d82b", "status": "affected", "versionType": "git" }, { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "2685df8577a38d83b367c8cf52eda9dc286959ff", "status": "affected", "versionType": "git" }, { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "50033ec1350fe68abdc63b950ced7ae57364b77a", "status": "affected", "versionType": "git" }, { "version": "936b8834366ec05f2a6993f73afd8348cac9718e", "lessThan": "d12f558e6200b3f47dbef9331ed6d115d2410e59", "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/xattr.c" ], "versions": [ { "version": "2.6.28", "status": "affected" }, { "version": "0", "lessThan": "2.6.28", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "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": "2.6.28", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.28", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a35a1c2b170b5b578b1b3fecb95694796552af9a" }, { "url": "https://git.kernel.org/stable/c/2323084c17370304f49c84b354fe7b3edbb264fe" }, { "url": "https://git.kernel.org/stable/c/6f702b00b8124c5d3525f19172934544826a114d" }, { "url": "https://git.kernel.org/stable/c/d919b905939eda93393e3572900ff70dbad2b47f" }, { "url": "https://git.kernel.org/stable/c/46e66fefb83811958127bc9ad736983ec629d82b" }, { "url": "https://git.kernel.org/stable/c/2685df8577a38d83b367c8cf52eda9dc286959ff" }, { "url": "https://git.kernel.org/stable/c/50033ec1350fe68abdc63b950ced7ae57364b77a" }, { "url": "https://git.kernel.org/stable/c/d12f558e6200b3f47dbef9331ed6d115d2410e59" } ], "title": "ocfs2: fix listxattr handling when the buffer is full", "x_generator": { "engine": "bippy-1.2.0" } } } }