145 lines
7.6 KiB
JSON
145 lines
7.6 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89991",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.780Z",
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"datePublished": "2026-09-16T10:33:05.097Z",
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"dateUpdated": "2026-10-19T08:56:05.536Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:56:05.536Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix infinite loop in pcpu_freelist push with one possible CPU\n\n__pcpu_freelist_push() can loop forever when only one CPU is possible\nand an NMI re-enters pcpu_freelist_push() while the interrupted context\nholds that CPU's freelist lock.\n\nAfter the current-CPU fast path fails, the fallback loop walks\ncpu_possible_mask while skipping the current CPU. With CONFIG_SMP=n, or\nwhen an SMP kernel is limited to one possible CPU with nr_cpus=1 or\npossible_cpus=1, there are no other possible CPUs to examine. The loop\ntherefore makes no lock acquisition attempt and can never make progress.\n\nThe following stack was observed on a UP system:\n\n NMI context:\n pcpu_freelist_push\n free_htab_elem\n htab_map_delete_elem\n [perf-event BPF program]\n __perf_event_overflow\n perf_event_nmi_handler\n exc_nmi\n\n Interrupted context:\n __pcpu_freelist_push\n pcpu_freelist_push\n free_htab_elem\n htab_map_delete_elem\n [raw_tp/sys_enter BPF program]\n __bpf_trace_sys_enter\n do_syscall_64\n\nraw_res_spin_lock() detects the same-CPU recursive acquisition and\nreturns -EDEADLK, but the subsequent fallback loop has no candidate head\non a system with one possible CPU.\n\nRestore the extra fallback head that existed before the rqspinlock\nconversion. Keep the current-CPU fast path, then try the other possible\nCPUs and finally the extra head. The additional head lets a push, which\ncannot fail without losing a preallocated element, make progress when the\nonly per-CPU head is held by the interrupted context.\n\nAlso check the extra head from the pop path so that nodes placed there\ncan be reused."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/bpf/percpu_freelist.c",
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"kernel/bpf/percpu_freelist.h"
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],
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"versions": [
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{
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"version": "f2ac0e5d1c4dcc55d6510dcaefb8f45661a9a1fb",
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"lessThan": "a24a146ae2cb5d9faeea96d10010fcb6579abe1f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f2ac0e5d1c4dcc55d6510dcaefb8f45661a9a1fb",
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"lessThan": "a5b5e62baceff9e252c6535cf42a027d04f226cf",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f2ac0e5d1c4dcc55d6510dcaefb8f45661a9a1fb",
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"lessThan": "efebf6496685c93150df5bb0794363ae70c5f58a",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/bpf/percpu_freelist.c",
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"kernel/bpf/percpu_freelist.h"
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],
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"versions": [
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{
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"version": "6.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.51",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.5",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.18.51"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.2.5"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a24a146ae2cb5d9faeea96d10010fcb6579abe1f"
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},
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{
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"url": "https://git.kernel.org/stable/c/a5b5e62baceff9e252c6535cf42a027d04f226cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/efebf6496685c93150df5bb0794363ae70c5f58a"
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}
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],
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"title": "bpf: Fix infinite loop in pcpu_freelist push with one possible CPU",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |