{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38230", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.996Z", "datePublished": "2025-07-04T13:37:44.264Z", "dateUpdated": "2026-08-05T12:00:31.185Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:00:31.185Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: validate AG parameters in dbMount() to prevent crashes\n\nValidate db_agheight, db_agwidth, and db_agstart in dbMount to catch\ncorrupted metadata early and avoid undefined behavior in dbAllocAG.\nLimits are derived from L2LPERCTL, LPERCTL/MAXAG, and CTLTREESIZE:\n\n- agheight: 0 to L2LPERCTL/2 (0 to 5) ensures shift\n (L2LPERCTL - 2*agheight) >= 0.\n- agwidth: 1 to min(LPERCTL/MAXAG, 2^(L2LPERCTL - 2*agheight))\n ensures agperlev >= 1.\n - Ranges: 1-8 (agheight 0-3), 1-4 (agheight 4), 1 (agheight 5).\n - LPERCTL/MAXAG = 1024/128 = 8 limits leaves per AG;\n 2^(10 - 2*agheight) prevents division to 0.\n- agstart: 0 to CTLTREESIZE-1 - agwidth*(MAXAG-1) keeps ti within\n stree (size 1365).\n - Ranges: 0-1237 (agwidth 1), 0-348 (agwidth 8).\n\nUBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1400:9\nshift exponent -335544310 is negative\nCPU: 0 UID: 0 PID: 5822 Comm: syz-executor130 Not tainted 6.14.0-rc5-syzkaller #0\nHardware name: Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025\nCall Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468\n dbAllocAG+0x1087/0x10b0 fs/jfs/jfs_dmap.c:1400\n dbDiscardAG+0x352/0xa20 fs/jfs/jfs_dmap.c:1613\n jfs_ioc_trim+0x45a/0x6b0 fs/jfs/jfs_discard.c:105\n jfs_ioctl+0x2cd/0x3e0 fs/jfs/ioctl.c:131\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The attack requires the crafted JFS image to be presented to the local system and mounted (loop device, or removable media auto-mounted by udisks2/autofs on a kiosk or shared workstation); the trigger is then a local syscall (write or FITRIM ioctl). No network path exists to jfs_mount()/dbAllocAG().\nAC:L - The corrupted db_agheight/db_agwidth/db_agstart values are read verbatim from the attacker's image, so the out-of-range shift and the wild stree[ti] index are fully deterministic — no race, no memory-layout dependency, and no reliance on any condition outside the attacker's control.\nPR:N - The attacker only has to author the filesystem image and needs no account or privilege on the target; post-mount the vulnerable dbAllocAG() path is reached by ordinary file allocation via dbAlloc() (jfs_dmap.c:948/964), so not even the CAP_SYS_ADMIN gate on FITRIM is required.\nUI:R - A user or automounter on the victim system must mount the malicious JFS image before dbMount() ingests the unvalidated AG parameters.\nS:U - The out-of-bounds accesses and the resulting allocation-map corruption are entirely confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `ti` is an unbounded signed int indexing an s8[1365] array inside a 4 KB metapage, yielding an arbitrary-offset out-of-bounds read of kernel heap memory, and the read bytes steer the returned block number, which is observable from userspace via FIBMAP/filefrag — a usable disclosure oracle, far beyond a bounded few-byte read.\nI:H - Out-of-bounds heap data determines blkno, which is passed to dbAllocCtl()/dbAllocDmap() to mark blocks allocated outside the valid map, and dbDiscardAG() then issues discards and dbFree() on those bogus ranges — corrupting filesystem allocation state and adjacent kernel structures.\nA:H - The wild index reaches unmapped addresses up to ±2 GB from the metapage, causing an oops/panic, and the negative-exponent shift is undefined behavior reported by UBSAN; the bogus discard/free ranges further corrupt the mounted filesystem." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/jfs/jfs_dmap.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "95ae5ee6069d9a5945772625f289422ef659221a", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a4259e72363e1ea204a97292001a9fc36c7e52fd", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c3705c82b7406a15ef38a610d03bf6baa43d6e0c", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9242ff6245527a3ebb693ddd175493b38ddca72f", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0c40fa81f850556e9aa0185fede9ef1112db7b39", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8b69608c6b6779a7ab07ce4467a56df90152cfb9", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b62a1e59d8716bbd2e73660743fe06acc97ed7d1", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "37bfb464ddca87f203071b5bd562cd91ddc0b40a", "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/jfs/jfs_dmap.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.296", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.240", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.187", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.143", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.96", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.36", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.4", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "2.6.12", "versionEndExcluding": "5.4.296" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.240" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.187" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.15.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/95ae5ee6069d9a5945772625f289422ef659221a" }, { "url": "https://git.kernel.org/stable/c/a4259e72363e1ea204a97292001a9fc36c7e52fd" }, { "url": "https://git.kernel.org/stable/c/c3705c82b7406a15ef38a610d03bf6baa43d6e0c" }, { "url": "https://git.kernel.org/stable/c/9242ff6245527a3ebb693ddd175493b38ddca72f" }, { "url": "https://git.kernel.org/stable/c/0c40fa81f850556e9aa0185fede9ef1112db7b39" }, { "url": "https://git.kernel.org/stable/c/8b69608c6b6779a7ab07ce4467a56df90152cfb9" }, { "url": "https://git.kernel.org/stable/c/b62a1e59d8716bbd2e73660743fe06acc97ed7d1" }, { "url": "https://git.kernel.org/stable/c/37bfb464ddca87f203071b5bd562cd91ddc0b40a" } ], "title": "jfs: validate AG parameters in dbMount() to prevent crashes", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:35:48.634Z" } } ] } }