{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-26632", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-26632" ], "published": "2024-03-18T10:09:50Z", "summary": "block: Fix iterating over an empty bio with bio_for_each_folio_all", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: Fix iterating over an empty bio with bio_for_each_folio_all\n\nIf the bio contains no data, bio_first_folio() calls page_folio() on a\nNULL pointer and oopses. Move the test that we've reached the end of\nthe bio from bio_next_folio() to bio_first_folio().\n\n[axboe: add unlikely() to error case]", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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" ], "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", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7l", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v8", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-2712", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v6", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v8", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-2712", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-v6", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-v7", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-v7l", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi4-rpi-v8", "binary_version": "1:6.1.54-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-2712", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v6", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v7", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v7l", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi6-rpi-v8", "binary_version": "1:6.1.58-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-2712", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v6", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v7", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v7l", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi7-rpi-v8", "binary_version": "1:6.1.63-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi8-rpi-2712", "binary_version": "1:6.1.73-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi8-rpi-v6", "binary_version": "1:6.1.73-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi8-rpi-v7", "binary_version": "1:6.1.73-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi8-rpi-v7l", "binary_version": "1:6.1.73-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi8-rpi-v8", "binary_version": "1:6.1.73-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.1.21-1+rpt1": { "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed", "upstream_version": "6.1.21", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.75" }, "1:6.1.47-1+rpt2": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.75" }, "1:6.1.47-1+rpt4": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.75", "compiled_filter": false }, "1:6.1.54-1+rpt2": { "linux_commit": "2906f7abdc03d4a92b6b0e2e0c87ea2a9dffe8f7", "upstream_version": "6.1.54", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.75" }, "1:6.1.58-1+rpt2": { "linux_commit": "ccf1586ad0663fa91238ac56abf6340d6d740d18", "upstream_version": "6.1.58", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.75" }, "1:6.1.63-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.63", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.75" }, "1:6.1.73-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.75" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-26632" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c6350b5cb78e9024c49eaee6fdb914ad2903a5fe" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a6bd8182137a12d22d3f2cee463271bdcb491659" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/ca3ede3f5893e2d26d4dbdef1eec28a8487fafde" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7" } ], "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": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - Triggered via local syscalls \u2014 `ioctl(SG_IO)` on a SCSI/block device fd, or `preadv2`/`pwritev2` with O_DIRECT \u2014 with no network-facing consumer of `bio_for_each_folio_all()` in the affected paths. No remote peer can reach `bio_first_folio()`.\nAC:L - Fully deterministic and race-free: the attacker just supplies a page-aligned but unmapped buffer so `iov_iter_extract_pages()` returns -EFAULT on the first iteration, leaving `bi_vcnt == 0` on the error path. syzbot produced a reliable C reproducer.\nPR:L - `scsi_cmd_allowed()` grants read-safe SG_IO commands to any user who can open the device (no CAP_SYS_RAWIO), and desktop/kiosk seat ACLs, `disk`/`cdrom` group membership, or container device grants provide that to unprivileged users; the bcachefs `O_DIRECT` path (fs/bcachefs/fs-io-direct.c:142) needs only an ordinary file. Real root in the init namespace is not required.\nUI:N - The attacking process performs the entire sequence itself with a single ioctl or direct-I/O syscall against an already-present device or file. No victim action, mount, or file-open by another user is involved.\nS:U - The uninitialized-bvec dereference and its consequences are confined to the kernel's own security authority on the same host, with no hypervisor, IOMMU, or sandbox boundary crossed.\nC:H - `bio_first_folio()` reads an uninitialized `bio_vec` from recycled mempool memory and `bio_check_pages_dirty()` then branches on `folio_test_dirty()` of that stale pointer, disclosing kernel heap state; the resulting page-refcount corruption is leverageable into arbitrary memory disclosure.\nI:H - `__bio_release_pages()` performs `folio_mark_dirty()` and `unpin_user_page()` on the stale, groomable `bv_page` for `bv_len` bytes, dropping refcounts on pages that were never pinned \u2014 a refcount underflow that yields premature free and a page-level use-after-free write primitive.\nA:H - syzbot reproduced both a NULL pointer dereference in `__bio_release_pages()` and a general protection fault in `bio_first_folio()`; either oopses the kernel and can be re-triggered at will by an unprivileged process." } } }