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vuln-cve/data/2026/23xxx/CVE-2026-23319.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-23319",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-01-13T15:37:45.995Z",
"datePublished": "2026-03-25T10:27:13.678Z",
"dateUpdated": "2026-11-10T12:42:30.476Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T22:04:35.115Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a UAF issue in bpf_trampoline_link_cgroup_shim\n\nThe root cause of this bug is that when 'bpf_link_put' reduces the\nrefcount of 'shim_link->link.link' to zero, the resource is considered\nreleased but may still be referenced via 'tr->progs_hlist' in\n'cgroup_shim_find'. The actual cleanup of 'tr->progs_hlist' in\n'bpf_shim_tramp_link_release' is deferred. During this window, another\nprocess can cause a use-after-free via 'bpf_trampoline_link_cgroup_shim'.\n\nBased on Martin KaFai Lau's suggestions, I have created a simple patch.\n\nTo fix this:\n Add an atomic non-zero check in 'bpf_trampoline_link_cgroup_shim'.\n Only increment the refcount if it is not already zero.\n\nTesting:\n I verified the fix by adding a delay in\n 'bpf_shim_tramp_link_release' to make the bug easier to trigger:\n\nstatic void bpf_shim_tramp_link_release(struct bpf_link *link)\n{\n\t/* ... */\n\tif (!shim_link->trampoline)\n\t\treturn;\n\n+\tmsleep(100);\n\tWARN_ON_ONCE(bpf_trampoline_unlink_prog(&shim_link->link,\n\t\tshim_link->trampoline, NULL));\n\tbpf_trampoline_put(shim_link->trampoline);\n}\n\nBefore the patch, running a PoC easily reproduced the crash(almost 100%)\nwith a call trace similar to KaiyanM's report.\nAfter the patch, the bug no longer occurs even after millions of\niterations."
}
],
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"kernel/bpf/trampoline.c"
],
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"programFiles": [
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],
"versions": [
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"status": "affected"
},
{
"version": "0",
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"status": "unaffected",
"versionType": "semver"
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{
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"lessThanOrEqual": "6.1.*",
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"versionType": "semver"
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"version": "7.0",
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"versionType": "original_commit_for_fix"
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"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.0",
"versionEndExcluding": "6.1.167"
},
{
"vulnerable": true,
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"references": [
{
"url": "https://git.kernel.org/stable/c/529e685e522b9d7fb379dbe6929dcdf520e34c8c"
},
{
"url": "https://git.kernel.org/stable/c/9b02c5c4147f8af8ed783c8deb5df927a55c3951"
},
{
"url": "https://git.kernel.org/stable/c/cfcfa0ca0212162aa472551266038e8fd6768cff"
},
{
"url": "https://git.kernel.org/stable/c/3eeddb80191f7626ec1ef742bfff51ec3b0fa5c2"
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{
"url": "https://git.kernel.org/stable/c/4e8a0005d633a4adc98e3b65d5080f93b90d356b"
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{
"url": "https://git.kernel.org/stable/c/56145d237385ca0e7ca9ff7b226aaf2eb8ef368b"
}
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"title": "bpf: Fix a UAF issue in bpf_trampoline_link_cgroup_shim",
"x_generator": {
"engine": "bippy-1.2.0"
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