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CVE-2026-74363 (GCVE-0-2026-74363)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted 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)
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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)
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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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      "title": "bpf: fix UAF by restoring RCU-delayed inode freeing in bpffs",
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    "cveId": "CVE-2026-74363",
    "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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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74363\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:37.900\",\"lastModified\":\"2026-08-17T06:19:31.050\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e28616ca3d67e745ecb2f10eba4a626e1fc9a203\",\"lessThan\":\"ea1c243c39e32b7fc1c2edfe32081ff7e30a877c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"743a620c661994c7f0938e6dd32fb0883fb1e0ea\",\"lessThan\":\"5fecb71c10c28aef276ba49c718dc961745fdcf0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6e9645be9eb93f7aff3ca887f8edb6f1d63358f\",\"lessThan\":\"c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ee04cff9ed4d6bb25802f5cecfcd0750500410f3\",\"lessThan\":\"53649846e0437d1d9b7cb993cfe54c367addf7ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f375ade6aa9f37fd72d7a78682f639772089eed\",\"lessThan\":\"61f19729728243c82476dee31315143ed3275e7f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f375ade6aa9f37fd72d7a78682f639772089eed\",\"lessThan\":\"0497ff765746d9b2d17445c8f7cc737b36c0152a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f375ade6aa9f37fd72d7a78682f639772089eed\",\"lessThan\":\"b93c55b4932dd7e32dca8cf34a3443cc87a02906\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"de2d2baecc84cc7fca52eec2b9b55d89c93e3565\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.195\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.157\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.113\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.54\",\"lessThan\":\"6.12.97\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.17.4\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0497ff765746d9b2d17445c8f7cc737b36c0152a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53649846e0437d1d9b7cb993cfe54c367addf7ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5fecb71c10c28aef276ba49c718dc961745fdcf0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61f19729728243c82476dee31315143ed3275e7f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b93c55b4932dd7e32dca8cf34a3443cc87a02906\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea1c243c39e32b7fc1c2edfe32081ff7e30a877c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.