{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-41017", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-41017" ], "published": "2024-07-29T06:37:18Z", "summary": "jfs: don't walk off the end of ealist", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: don't walk off the end of ealist\n\nAdd a check before visiting the members of ea to\nmake sure each ea stays within the ealist.", "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", "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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"https://git.kernel.org/stable/c/dbde7bc91093fa9c2410e418b236b70fde044b73" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d0fa70aca54c8643248e89061da23752506ec0d4" } ], "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 - Exploitation requires a locally-mounted crafted JFS image and is triggered through the getxattr()/listxattr() syscalls (or implicitly via jfs_get_acl() during permission checks) on the attacker's own file. There is no network-facing path into fs/jfs.\nAC:L - The attacker fully authors the on-disk EA list, so the out-of-bounds offset and length are deterministic and reliably reproducible with no dependence on uncontrolled state. The double-fetch write variant in jfs_listxattr() is likewise attacker-paced, since they control both the heap churn adjacent to the inline-EA slab object and the rate of syscalls.\nPR:L - On desktop, kiosk and workstation deployments removable media is mounted for the logged-in unprivileged user by udisks2/autofs, after which any unprivileged local user can trigger the overread on the crafted file. No CAP_SYS_ADMIN is needed for the triggering getxattr()/listxattr() calls themselves.\nUI:N - Once the filesystem is present, the attacker triggers the bug entirely on their own by calling getxattr()/listxattr() on their crafted file \u2014 even an `ls -l` style permission check reaches it via jfs_get_acl(). No victim action is required at exploitation time.\nS:U - The out-of-bounds access and its consequences are confined to the kernel's own memory and the same security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - An attacker-chosen valuelen of up to 65535 makes __jfs_getxattr() memcpy up to 64 KB from beyond the EA buffer \u2014 frequently the 128-byte i_inline_ea field inside a jfs_inode_info slab object \u2014 and that adjacent kernel heap is returned directly to userspace. This is a large, unbounded infoleak that can disclose kernel pointers, keys, and other tasks' data.\nI:H - jfs_listxattr() re-derives namelen, the os2-prefix decision, and NEXT_EA() from out-of-bounds memory in both its sizing pass and its copy pass, so a concurrent change to those bytes lets the copy pass overflow the kvmalloc'd klist buffer \u2014 a kernel heap out-of-bounds write. Additionally, out-of-bounds heap bytes are parsed as POSIX ACL entries by jfs_get_acl(), corrupting the access rules applied to the inode.\nA:H - Reading up to 64 KB past a 128-byte inline buffer or a metapage routinely walks into unmapped pages, producing a general protection fault or oops, and KASAN/hardened configurations panic on the slab overread. The heap overflow write in jfs_listxattr() likewise corrupts allocator state and crashes the kernel." } } }