{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49985", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.386Z", "datePublished": "2025-06-18T11:00:47.251Z", "dateUpdated": "2026-08-05T08:57:01.160Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:01.160Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't use tnum_range on array range checking for poke descriptors\n\nHsin-Wei reported a KASAN splat triggered by their BPF runtime fuzzer which\nis based on a customized syzkaller:\n\n BUG: KASAN: slab-out-of-bounds in bpf_int_jit_compile+0x1257/0x13f0\n Read of size 8 at addr ffff888004e90b58 by task syz-executor.0/1489\n CPU: 1 PID: 1489 Comm: syz-executor.0 Not tainted 5.19.0 #1\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n 1.13.0-1ubuntu1.1 04/01/2014\n Call Trace:\n \n dump_stack_lvl+0x9c/0xc9\n print_address_description.constprop.0+0x1f/0x1f0\n ? bpf_int_jit_compile+0x1257/0x13f0\n kasan_report.cold+0xeb/0x197\n ? kvmalloc_node+0x170/0x200\n ? bpf_int_jit_compile+0x1257/0x13f0\n bpf_int_jit_compile+0x1257/0x13f0\n ? arch_prepare_bpf_dispatcher+0xd0/0xd0\n ? rcu_read_lock_sched_held+0x43/0x70\n bpf_prog_select_runtime+0x3e8/0x640\n ? bpf_obj_name_cpy+0x149/0x1b0\n bpf_prog_load+0x102f/0x2220\n ? __bpf_prog_put.constprop.0+0x220/0x220\n ? find_held_lock+0x2c/0x110\n ? __might_fault+0xd6/0x180\n ? lock_downgrade+0x6e0/0x6e0\n ? lock_is_held_type+0xa6/0x120\n ? __might_fault+0x147/0x180\n __sys_bpf+0x137b/0x6070\n ? bpf_perf_link_attach+0x530/0x530\n ? new_sync_read+0x600/0x600\n ? __fget_files+0x255/0x450\n ? lock_downgrade+0x6e0/0x6e0\n ? fput+0x30/0x1a0\n ? ksys_write+0x1a8/0x260\n __x64_sys_bpf+0x7a/0xc0\n ? syscall_enter_from_user_mode+0x21/0x70\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n RIP: 0033:0x7f917c4e2c2d\n\nThe problem here is that a range of tnum_range(0, map->max_entries - 1) has\nlimited ability to represent the concrete tight range with the tnum as the\nset of resulting states from value + mask can result in a superset of the\nactual intended range, and as such a tnum_in(range, reg->var_off) check may\nyield true when it shouldn't, for example tnum_range(0, 2) would result in\n00XX -> v = 0000, m = 0011 such that the intended set of {0, 1, 2} is here\nrepresented by a less precise superset of {0, 1, 2, 3}. As the register is\nknown const scalar, really just use the concrete reg->var_off.value for the\nupper index check." } ], "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 vulnerability is triggered by loading a crafted eBPF program via the bpf() syscall (BPF_PROG_LOAD → verifier → JIT), which is a local attack vector.\nAC:L - The attacker fully controls PROG_ARRAY max_entries and the constant tail-call index, and a public PoC reliably triggers the slab OOB during JIT with no conditions outside attacker control.\nPR:L - Exploitation requires loading BPF programs and creating a PROG_ARRAY (CAP_BPF, or unprivileged BPF where enabled); this is basic/low privilege relative to full root, consistent with other BPF verifier OOB scorings.\nUI:N - No victim action is required; the attacker triggers the bug solely by loading their own crafted BPF program.\nS:U - Impact stays within the kernel's authority (local memory corruption / potential privilege escalation); it does not cross a VM, IOMMU, or other security boundary.\nC:H - The bug is a slab out-of-bounds read of pointer-sized values from adjacent memory, and with attacker-chosen map sizes the OOB can span kilobytes, enabling high-impact disclosure primitives.\nI:H - The OOB-read pointer is passed to bpf_tail_call_direct_fixup / __bpf_arch_text_poke, which patches JIT code with a jump derived from that value, yielding a controllable integrity / control-flow corruption primitive.\nA:H - The OOB access was confirmed via KASAN as a slab-out-of-bounds read in bpf_int_jit_compile, and dereferencing a garbage target pointer can cause a kernel oops/panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/verifier.c" ], "versions": [ { "version": "d2e4c1e6c2947269346054ac8937ccfe9e0bcc6b", "lessThan": "e8979807178434db8ceaa84dfcd44363e71e50bb", "status": "affected", "versionType": "git" }, { "version": "d2e4c1e6c2947269346054ac8937ccfe9e0bcc6b", "lessThan": "4f672112f8665102a5842c170be1713f8ff95919", "status": "affected", "versionType": "git" }, { "version": "d2e4c1e6c2947269346054ac8937ccfe9e0bcc6b", "lessThan": "a36df92c7ff7ecde2fb362241d0ab024dddd0597", "status": "affected", "versionType": "git" }, { "version": "d2e4c1e6c2947269346054ac8937ccfe9e0bcc6b", "lessThan": "a657182a5c5150cdfacb6640aad1d2712571a409", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/verifier.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.140", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.64", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.6", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "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": "5.5", "versionEndExcluding": "5.10.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.64" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e8979807178434db8ceaa84dfcd44363e71e50bb" }, { "url": "https://git.kernel.org/stable/c/4f672112f8665102a5842c170be1713f8ff95919" }, { "url": "https://git.kernel.org/stable/c/a36df92c7ff7ecde2fb362241d0ab024dddd0597" }, { "url": "https://git.kernel.org/stable/c/a657182a5c5150cdfacb6640aad1d2712571a409" } ], "title": "bpf: Don't use tnum_range on array range checking for poke descriptors", "x_generator": { "engine": "bippy-1.2.0" } } } }