{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-39472", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-39472" ], "published": "2024-07-05T06:42:39Z", "summary": "xfs: fix log recovery buffer allocation for the legacy h_size fixup", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix log recovery buffer allocation for the legacy h_size fixup\n\nCommit a70f9fe52daa (\"xfs: detect and handle invalid iclog size set by\nmkfs\") added a fixup for incorrect h_size values used for the initial\numount record in old xfsprogs versions. Later commit 0c771b99d6c9\n(\"xfs: clean up calculation of LR header blocks\") cleaned up the log\nreover buffer calculation, but stoped using the fixed up h_size value\nto size the log recovery buffer, which can lead to an out of bounds\naccess when the incorrect h_size does not come from the old mkfs\ntool, but a fuzzer.\n\nFix this by open coding xlog_logrec_hblks and taking the fixed h_size\ninto account for this calculation.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", 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"c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.46" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-39472" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/f754591b17d0ee91c2b45fe9509d0cdc420527cb" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/57835c0e7152e36b03875dd6c56dfeed685c1b1f" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c2389c074973aa94e34992e7f66dac0de37595b5" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/45cf976008ddef4a9c9a30310c9b4fb2a9a6602a" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.3, "cvss_v3_severity": "High", "scenario": "AV:L - The bug is reached only through XFS log recovery at mount time on a locally attached block device or image file; no network or remote-peer data reaches this code. Delivery via removable media still requires the image to be mounted on the local system.\nAC:L - Every input is attacker-chosen on-disk data \u2014 `sb_logsunit` (raises `m_logbsize` to 256K with no mount option needed), and `h_size`/`h_len`/`h_num_logops`/`h_version` in the tail log record \u2014 so the undersized `hbp` and the ~224 KB overread happen deterministically on every mount, with no race and no memory layout to groom.\nPR:N - The attacker needs no account or privilege on the target; they only need to hand over a crafted XFS image (USB stick, disk image, exported LUN) that is then mounted by the victim or by an automounter such as udisks2 on a desktop or kiosk. Equivalently, an unprivileged local user on an automount-enabled system reaches it with PR:L/UI:N, which yields the identical exploitability score.\nUI:R - A user or automount service must mount the malicious filesystem with a dirty log so that `xlog_do_recovery_pass()` runs; the attacker cannot initiate the mount themselves.\nS:U - The out-of-bounds access and its consequences stay inside the kernel's own security authority \u2014 no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `xlog_cksum()` and `xlog_unpack_data()` read at 32 KB strides up to ~224 KB past a 512-byte `kvzalloc()` slab object, and on a non-CRC (v4) image the harvested heap dwords are copied into the replayed log data and committed to the filesystem, giving the attacker a large, readable kernel heap disclosure.\nI:L - There is no out-of-bounds write \u2014 `dbp` is sized from the fixed-up `h_size` and `bblks <= BTOBB(h_size)` \u2014 but the out-of-bounds kernel heap dwords are spliced into the log record data by `xlog_unpack_data()` and replayed into on-disk metadata, producing limited, attacker-uncontrolled modification of filesystem data.\nA:H - Reading roughly 224 KB beyond a 512-byte slab allocation readily crosses into unmapped memory, producing a page fault/oops (or a KASAN slab-out-of-bounds panic) during mount, taking down the system." } } }