CVE-2026-74363 (GCVE-0-2026-74363)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
EPSS
VEX
Title
bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs
commit 4f375ade6aa9 ("bpf: Avoid RCU context warning when unpinning
htab with internal structs") moved inode cleanup from ->free_inode()
into ->destroy_inode() to avoid sleeping in RCU context when calling
bpf_any_put(). However this removed the RCU delay on freeing the
inode itself and the cached symlink body (i_link), both of which
can be accessed by RCU pathwalk (pick_link, may_lookup etc.).
This causes a use-after-free when a concurrent unlinkat() drops the
last inode reference and destroy_inode() frees the inode immediately,
while another task is still walking the path in RCU mode and reads
inode->i_opflags (offset +2) inside current_time() -> is_mgtime().
KASAN reports:
BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313
Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)
The rules (per Al Viro):
->destroy_inode() called immediately, can sleep, use for blocking
cleanup e.g. bpf_any_put()
->free_inode() called after RCU grace period, use for freeing
inode and anything RCU-accessible e.g. i_link
Fix: split the two concerns properly:
- keep bpf_any_put() in bpf_destroy_inode() since it is blocking
and needs to run promptly
- introduce bpf_free_inode() to handle kfree(i_link) and
free_inode_nonrcu() with proper RCU delay, preventing the UAF
Severity
7.8 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e28616ca3d67e745ecb2f10eba4a626e1fc9a203 , < ea1c243c39e32b7fc1c2edfe32081ff7e30a877c
(git)
Affected: 743a620c661994c7f0938e6dd32fb0883fb1e0ea , < 5fecb71c10c28aef276ba49c718dc961745fdcf0 (git) Affected: b6e9645be9eb93f7aff3ca887f8edb6f1d63358f , < c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2 (git) Affected: ee04cff9ed4d6bb25802f5cecfcd0750500410f3 , < 53649846e0437d1d9b7cb993cfe54c367addf7ae (git) Affected: 4f375ade6aa9f37fd72d7a78682f639772089eed , < 61f19729728243c82476dee31315143ed3275e7f (git) Affected: 4f375ade6aa9f37fd72d7a78682f639772089eed , < 0497ff765746d9b2d17445c8f7cc737b36c0152a (git) Affected: 4f375ade6aa9f37fd72d7a78682f639772089eed , < b93c55b4932dd7e32dca8cf34a3443cc87a02906 (git) Affected: de2d2baecc84cc7fca52eec2b9b55d89c93e3565 (git) Affected: 5.15.195 , < 5.15.212 (semver) Affected: 6.1.157 , < 6.1.178 (semver) Affected: 6.6.113 , < 6.6.145 (semver) Affected: 6.12.54 , < 6.12.97 (semver) Affected: 6.17.4 , < 6.18 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.18
Unaffected: 0 , < 6.18 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\n\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from -\u003efree_inode()\ninto -\u003edestroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\n\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode-\u003ei_opflags (offset +2) inside current_time() -\u003e is_mgtime().\n\nKASAN reports:\n BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\n Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\n\nThe rules (per Al Viro):\n -\u003edestroy_inode() called immediately, can sleep, use for blocking\n cleanup e.g. bpf_any_put()\n -\u003efree_inode() called after RCU grace period, use for freeing\n inode and anything RCU-accessible e.g. i_link\n\nFix: split the two concerns properly:\n - keep bpf_any_put() in bpf_destroy_inode() since it is blocking\n and needs to run promptly\n - introduce bpf_free_inode() to handle kfree(i_link) and\n free_inode_nonrcu() with proper RCU delay, preventing the UAF"
}
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"value": "AV:L - The bug is triggered through local VFS and bpf(2) syscalls on bpffs (unlinkat/symlinkat/openat/stat and BPF_OBJ_GET/BPF_OBJ_PIN) racing RCU pathwalk; BPF/bpffs is not reachable from remote network services.\nAC:L - Exploitation requires a race between unlinkat dropping the last bpffs inode reference and concurrent RCU pathwalk, but the attacker controls both sides with parallel threads/syscalls and syzbot reliably reproduces the UAF without external timing.\nPR:L - Any local user with write access to a bpffs mount (default sticky world-writable /sys/fs/bpf) can create symlinks or pin/unpin BPF objects without init-namespace root, including via unprivileged BPF or delegated bpffs mounts in user namespaces.\nUI:N - No victim action is required; the attacker programmatically races their own unlink/pathwalk operations on bpffs objects they can create and remove.\nS:U - This is a kernel heap use-after-free in bpffs inode lifetime management, enabling local privilege escalation within the same security domain rather than crossing VM, IOMMU, or sandbox boundaries.\nC:H - KASAN confirmed slab use-after-free reading freed inode-\u003ei_opflags during RCU pathwalk; UAF of struct inode enables subsequent arbitrary kernel memory disclosure via heap reuse.\nI:H - Premature inode freeing permits attacker-controlled heap reuse and spraying, providing a standard kernel UAF path to arbitrary write and potential code execution beyond the initial 2-byte read.\nA:H - Concurrent RCU pathwalk of a prematurely freed bpffs inode triggers KASAN slab-UAF and kernel oops; repeated triggering can panic the system or cause denial of service."
}
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"datePublished": "2026-08-15T05:58:46.220Z",
"dateReserved": "2026-08-15T05:44:03.887Z",
"dateUpdated": "2026-08-17T05:46:21.981Z",
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"date": "2026-10-01",
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix UAF by restoring RCU-delayed inode freeing in bpffs\n\ncommit 4f375ade6aa9 (\"bpf: Avoid RCU context warning when unpinning\nhtab with internal structs\") moved inode cleanup from -\u003efree_inode()\ninto -\u003edestroy_inode() to avoid sleeping in RCU context when calling\nbpf_any_put(). However this removed the RCU delay on freeing the\ninode itself and the cached symlink body (i_link), both of which\ncan be accessed by RCU pathwalk (pick_link, may_lookup etc.).\n\nThis causes a use-after-free when a concurrent unlinkat() drops the\nlast inode reference and destroy_inode() frees the inode immediately,\nwhile another task is still walking the path in RCU mode and reads\ninode-\u003ei_opflags (offset +2) inside current_time() -\u003e is_mgtime().\n\nKASAN reports:\n BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313\n Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)\n\nThe rules (per Al Viro):\n -\u003edestroy_inode() called immediately, can sleep, use for blocking\n cleanup e.g. bpf_any_put()\n -\u003efree_inode() called after RCU grace period, use for freeing\n inode and anything RCU-accessible e.g. i_link\n\nFix: split the two concerns properly:\n - keep bpf_any_put() in bpf_destroy_inode() since it is blocking\n and needs to run promptly\n - introduce bpf_free_inode() to handle kfree(i_link) and\n free_inode_nonrcu() with proper RCU delay, preventing the UAF"
}
],
"id": "CVE-2026-74363",
"lastModified": "2026-08-17T06:19:31.050",
"metrics": {
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{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
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},
"published": "2026-08-15T06:22:37.900",
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ea1c243c39e32b7fc1c2edfe32081ff7e30a877c"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-20T20:53:16+00:00",
"cve": "CVE-2026-74363",
"id": "CVE-2026-74363",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74363.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-22T16:36:22Z",
"cve": "CVE-2026-74363",
"id": "CVE-2026-74363",
"initial_release_date": "2026-09-02T11:44:35Z",
"product_status:first_fixed": "60",
"product_status:known_affected": "34",
"product_status:known_not_affected": "328",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-74363",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74363.json",
"version": "5"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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