302 lines
17 KiB
JSON
302 lines
17 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2024-26737",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-02-19T14:20:24.166Z",
|
|
"datePublished": "2024-04-03T17:00:23.414Z",
|
|
"dateUpdated": "2026-08-05T11:26:56.105Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T11:26:56.105Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel\n\nThe following race is possible between bpf_timer_cancel_and_free\nand bpf_timer_cancel. It will lead a UAF on the timer->timer.\n\nbpf_timer_cancel();\n\tspin_lock();\n\tt = timer->time;\n\tspin_unlock();\n\n\t\t\t\t\tbpf_timer_cancel_and_free();\n\t\t\t\t\t\tspin_lock();\n\t\t\t\t\t\tt = timer->timer;\n\t\t\t\t\t\ttimer->timer = NULL;\n\t\t\t\t\t\tspin_unlock();\n\t\t\t\t\t\thrtimer_cancel(&t->timer);\n\t\t\t\t\t\tkfree(t);\n\n\t/* UAF on t */\n\thrtimer_cancel(&t->timer);\n\nIn bpf_timer_cancel_and_free, this patch frees the timer->timer\nafter a rcu grace period. This requires a rcu_head addition\nto the \"struct bpf_hrtimer\". Another kfree(t) happens in bpf_timer_init,\nthis does not need a kfree_rcu because it is still under the\nspin_lock and timer->timer has not been visible by others yet.\n\nIn bpf_timer_cancel, rcu_read_lock() is added because this helper\ncan be used in a non rcu critical section context (e.g. from\na sleepable bpf prog). Other timer->timer usages in helpers.c\nhave been audited, bpf_timer_cancel() is the only place where\ntimer->timer is used outside of the spin_lock.\n\nAnother solution considered is to mark a t->flag in bpf_timer_cancel\nand clear it after hrtimer_cancel() is done. In bpf_timer_cancel_and_free,\nit busy waits for the flag to be cleared before kfree(t). This patch\ngoes with a straight forward solution and frees timer->timer after\na rcu grace period."
|
|
}
|
|
],
|
|
"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 - Both sides of the race are driven through local syscalls — `bpf(BPF_PROG_LOAD)`/`BPF_PROG_TEST_RUN` to run a program calling `bpf_timer_cancel()`, and `BPF_MAP_DELETE_ELEM`/`close()` to drive `bpf_timer_cancel_and_free()`. No remotely supplied data reaches `kernel/bpf/helpers.c`, and BPF is classified as a local attack vector under kernel scoring guidance.\nAC:L - The attacker owns both racers — one thread runs its own BPF program calling `bpf_timer_cancel()` while another deletes the map element or drops the map uref — and can widen the window arbitrarily by making its own timer callback long-running, since `hrtimer_cancel()` blocks in `hrtimer_cancel_wait_running()` while the other thread finishes and `kfree()`s `t`. Nothing depends on state outside the attacker's control and the sequence can be retried in a tight loop.\nPR:L - The `bpf_timer_*` helpers are gated on `bpf_capable()` (CAP_BPF/CAP_SYS_ADMIN), a reduced non-root capability routinely delegated to unprivileged service, tracing and container workloads that are not init-namespace root. This matches this CNA's established scoring for the sibling `bpf_timer` UAFs CVE-2024-41045 and CVE-2024-42239.\nUI:N - The attacker loads its own program, arms its own timer, and issues both the cancel and the map-delete from its own threads. No victim action, mount, or interaction with any other principal is required.\nS:U - The freed `struct bpf_hrtimer` and the corrupted per-CPU hrtimer state are entirely kernel-internal, so the impact stays within the kernel's own security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `hrtimer_active()` reads `timer->base` out of the freed object and dereferences it (`base->seq`, `base->running`), so reclaiming the 96-byte `kmalloc-cg-96` slot with sprayed data (e.g. `msg_msg`) turns this into an attacker-directed kernel-memory read, with the helper's return value acting as an oracle. That yields arbitrary kernel data disclosure and KASLR defeat.\nI:H - After `hrtimer_active()` returns true, `lock_hrtimer_base()` takes a spinlock at an attacker-controlled address and `remove_hrtimer()`/`__remove_hrtimer()` writes `timer->state`, performs `timerqueue_del()` rb-tree unlinking and clears bits in `cpu_base->active_bases` through the same forged pointer. This is a controlled kernel write primitive suitable for privilege escalation.\nA:H - Even without a successful spray, operating on freed memory corrupts the per-CPU hrtimer queue and produces a KASAN splat, oops, or panic, and a garbage `timer->base` sends `hrtimer_cancel()` into an unterminating retry loop. The attacker can trigger this at will, repeatedly."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"kernel/bpf/helpers.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "b00628b1c7d595ae5b544e059c27b1f5828314b4",
|
|
"lessThan": "5268bb02107b9eedfdcd51db75b407d10043368c",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b00628b1c7d595ae5b544e059c27b1f5828314b4",
|
|
"lessThan": "addf5e297e6cbf5341f9c07720693ca9ba0057b5",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b00628b1c7d595ae5b544e059c27b1f5828314b4",
|
|
"lessThan": "8327ed12e8ebc5436bfaa1786c49988894f9c8a6",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b00628b1c7d595ae5b544e059c27b1f5828314b4",
|
|
"lessThan": "7d80a9e745fa5b47da3bca001f186c02485c7c33",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b00628b1c7d595ae5b544e059c27b1f5828314b4",
|
|
"lessThan": "0281b919e175bb9c3128bd3872ac2903e9436e3f",
|
|
"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/helpers.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "5.15",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "5.15",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.15.150",
|
|
"lessThanOrEqual": "5.15.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.80",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.19",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.7.7",
|
|
"lessThanOrEqual": "6.7.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.8",
|
|
"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": "5.15",
|
|
"versionEndExcluding": "5.15.150"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.15",
|
|
"versionEndExcluding": "6.1.80"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.15",
|
|
"versionEndExcluding": "6.6.19"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.15",
|
|
"versionEndExcluding": "6.7.7"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.15",
|
|
"versionEndExcluding": "6.8"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/5268bb02107b9eedfdcd51db75b407d10043368c"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/addf5e297e6cbf5341f9c07720693ca9ba0057b5"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/8327ed12e8ebc5436bfaa1786c49988894f9c8a6"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/7d80a9e745fa5b47da3bca001f186c02485c7c33"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/0281b919e175bb9c3128bd3872ac2903e9436e3f"
|
|
}
|
|
],
|
|
"title": "bpf: Fix racing between bpf_timer_cancel_and_free and bpf_timer_cancel",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"type": "CWE",
|
|
"lang": "en",
|
|
"description": "CWE-noinfo Not enough information"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"scope": "UNCHANGED",
|
|
"version": "3.1",
|
|
"baseScore": 5.5,
|
|
"attackVector": "LOCAL",
|
|
"baseSeverity": "MEDIUM",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
|
|
"integrityImpact": "NONE",
|
|
"userInteraction": "NONE",
|
|
"attackComplexity": "LOW",
|
|
"availabilityImpact": "HIGH",
|
|
"privilegesRequired": "LOW",
|
|
"confidentialityImpact": "NONE"
|
|
}
|
|
},
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"timestamp": "2024-04-03T19:13:11.173900Z",
|
|
"id": "CVE-2024-26737",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"role": "CISA Coordinator",
|
|
"version": "2.0.3"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2024-11-04T18:51:47.375Z"
|
|
}
|
|
},
|
|
{
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2024-08-02T00:14:13.230Z"
|
|
},
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/5268bb02107b9eedfdcd51db75b407d10043368c",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/addf5e297e6cbf5341f9c07720693ca9ba0057b5",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/8327ed12e8ebc5436bfaa1786c49988894f9c8a6",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/7d80a9e745fa5b47da3bca001f186c02485c7c33",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/0281b919e175bb9c3128bd3872ac2903e9436e3f",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |