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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    "assignerShortName": "Linux",
    "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",
    "state": "PUBLISHED"
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      "date": "2026-09-22",
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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"
          }
        ],
        "id": "CVE-2026-74363",
        "lastModified": "2026-08-17T06:19:31.050",
        "metrics": {
          "cvssMetricV31": [
            {
              "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"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T06:22:37.900",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "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"
          }
        ],
        "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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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.



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.