CVE-2025-38382

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This results in an invalid memory\naccess in the next iteration of the loop since victim_name.len was not\ninitialized to the length of the name of the current extref.\n\nFix this by initializing victim_name.len with the current extref's name\nlength."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is only reached through tree-log replay during `mount(2)` of a btrfs volume (open_ctree \u2192 btrfs_replay_log \u2192 __add_inode_ref), so the attacker needs local access to present the crafted image via a block device, loop file, or removable media. There is no network-facing path into btrfs log replay.\nAC:L - Triggering is fully deterministic \u2014 the tree-checker's `check_inode_extref()` never validates the embedded `parent_objectid` against the item's hash key, so the attacker simply places a mismatching-parent extref first in the item and sets `super_log_root` so replay runs automatically. No race, timing window, or unpredictable memory layout is involved in reaching the invalid access.\nPR:L - btrfs does not set `FS_USERNS_MOUNT`, but an unprivileged session user routinely causes attacker-supplied btrfs media to be mounted by udisks2/systemd automounters on desktops, kiosks, and shared workstations, and image-processing services loop-mount untrusted images on behalf of low-privileged callers. No elevated capability of the attacker's own is needed in that scenario.\nUI:N - Once the crafted volume is attached, the automounter mounts it and log replay runs unconditionally because `btrfs_super_log_root(disk_super) != 0` is checked with no operator prompt. The attacker performs the mount-triggering action themselves; no separate victim action is required.\nS:U - The out-of-bounds access and the resulting corruption stay within the kernel's own security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The uninitialized `victim_name.len` makes `btrfs_get_64()` read past `eb->len`, and with the accessor's `ASSERT(check_setget_bounds(...))` compiled out on production kernels, `get_eb_folio_index()` runs off the end of `eb->folios[]` (index 16 with an attacker-chosen 64K nodesize on 4K pages), turning adjacent slab contents into a `struct folio *` that `folio_address()` dereferences \u2014 an unbounded wild kernel read, not a few-byte bounded one.\nI:H - The out-of-bounds and uninitialized data is interpreted as inode backref metadata and then acted upon: `read_one_inode()` on a garbage `parent_objectid`, `inc_nlink()` on the inode, and `unlink_inode_for_log_replay()` removing directory entries, so kernel memory read out of bounds directly drives modification of filesystem state. Combined with the wild-pointer arithmetic on `eb->folios[]`, this is memory corruption that must be treated as leverageable for control-flow influence.\nA:H - In the common configurations the bogus folio index yields a NULL or wild `folio_address()` dereference during mount, producing a kernel oops, and with `CONFIG_BTRFS_ASSERT=y` the bounds assertion calls `BUG()` outright. Either outcome is a kernel crash in the mount path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/tree-log.c"], "versions": [{"version": "1cf474cd474bc5d3ef63086ffd009a87a5b7bb2e", "lessThan": "539969fc472886a1d63565459514d47e27fef461", "status": "affected", "versionType": "git"}, {"version": "e43eec81c5167b655b72c781b0e75e62a05e415e", "lessThan": "2d11d274e2e1d7c79e2ca8461ce3ff3a95c11171", "status": "affected", "versionType": "git"}, {"version": "e43eec81c5167b655b72c781b0e75e62a05e415e", "lessThan": "7ac790dc2ba00499a8d671d4a24de4d4ad27e234", "status": "affected", "versionType": "git"}, {"version": "e43eec81c5167b655b72c781b0e75e62a05e415e", "lessThan": "aee57a0293dca675637e5504709f9f8fd8e871be", "status": "affected", "versionType": "git"}, {"version": "e43eec81c5167b655b72c781b0e75e62a05e415e", "lessThan": "54a7081ed168b72a8a2d6ef4ba3a1259705a2926", "status": "affected", "versionType": "git"}, {"version": "6.1.57", "lessThan": "6.1.144", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/tree-log.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.144", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.97", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.37", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.6", "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": "6.1.57", "versionEndExcluding": "6.1.144"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.37"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.15.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/539969fc472886a1d63565459514d47e27fef461"}, {"url": "https://git.kernel.org/stable/c/2d11d274e2e1d7c79e2ca8461ce3ff3a95c11171"}, {"url": "https://git.kernel.org/stable/c/7ac790dc2ba00499a8d671d4a24de4d4ad27e234"}, {"url": "https://git.kernel.org/stable/c/aee57a0293dca675637e5504709f9f8fd8e871be"}, {"url": "https://git.kernel.org/stable/c/54a7081ed168b72a8a2d6ef4ba3a1259705a2926"}], "title": "btrfs: fix iteration of extrefs during log replay", "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"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:37:15.284Z"}}]}}

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This results in an invalid memory\naccess in the next iteration of the loop since victim_name.len was not\ninitialized to the length of the name of the current extref.\n\nFix this by initializing victim_name.len with the current extref's name\nlength."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: correcci\u00f3n de la iteraci\u00f3n de referencias externas durante la reproducci\u00f3n del registro. En __inode_add_ref(), al procesar referencias externas, si saltamos a la siguiente etiqueta, obtenemos un valor indefinido de victim_name.len, ya que no lo inicializamos antes de ejecutar el comando goto. Esto provoca un acceso a memoria no v\u00e1lido en la siguiente iteraci\u00f3n del bucle, ya que victim_name.len no se inicializ\u00f3 con la longitud del nombre de la referencia externa actual. Para solucionar esto, inicialice victim_name.len con la longitud del nombre de la referencia externa actual."}], "id": "CVE-2025-38382", "lastModified": "2026-07-30T06:23:11.367", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-25T13:15:27.390", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d11d274e2e1d7c79e2ca8461ce3ff3a95c11171"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/539969fc472886a1d63565459514d47e27fef461"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/54a7081ed168b72a8a2d6ef4ba3a1259705a2926"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ac790dc2ba00499a8d671d4a24de4d4ad27e234"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aee57a0293dca675637e5504709f9f8fd8e871be"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix iteration of extrefs during log replay", "id": "2383423", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383423"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: fix iteration of extrefs during log replay\nAt __inode_add_ref() when processing extrefs, if we jump into the next\nlabel we have an undefined value of victim_name.len, since we haven't\ninitialized it before we did the goto. This results in an invalid memory\naccess in the next iteration of the loop since victim_name.len was not\ninitialized to the length of the name of the current extref.\nFix this by initializing victim_name.len with the current extref's name\nlength."], "name": "CVE-2025-38382", "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": "2025-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38382\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38382\nhttps://lore.kernel.org/linux-cve-announce/2025072505-CVE-2025-38382-c4f2@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-26T11:21:58.740060+00:00", "updated": "2025-07-26T11:21:58.740113+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}