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CVE-2026-68284 (GCVE-0-2026-68284)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-19 16:32
VLAI
Title
bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg() tcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which drops and reacquires the socket lock. Its error path tries to decide whether msg_tx names the local temporary message by comparing it with the current value of psock->cork. This comparison is unsafe when two threads send on the same socket: Thread A Thread B msg_tx = psock->cork sk_msg_alloc() fails sk_stream_wait_memory() releases the socket lock acquires the socket lock completes the cork psock->cork = NULL frees the cork reacquires the socket lock msg_tx != psock->cork sk_msg_free(msg_tx) The stale cork is therefore mistaken for the local temporary message and freed again. KASAN reported: BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50 Read of size 4 at addr ffff88810c908800 by task poc/90 Call Trace: sk_msg_free+0x49/0x50 tcp_bpf_sendmsg+0x14f5/0x1cc0 __sys_sendto+0x32c/0x3a0 __x64_sys_sendto+0xdb/0x1b0 Allocated by task 89: __kasan_kmalloc+0x8f/0xa0 tcp_bpf_sendmsg+0x16b3/0x1cc0 Freed by task 91: __kasan_slab_free+0x43/0x70 kfree+0x131/0x3c0 tcp_bpf_sendmsg+0xec3/0x1cc0 msg_tx can only name the stack-local tmp or the shared cork. Check for tmp directly so a changed psock->cork cannot turn a shared message into an apparent local one.
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: 604326b41a6fb9b4a78b6179335decee0365cd8c , < 0688e6fe599d2d39147ae9ece97944c6e1815ebf (git)
Affected: 604326b41a6fb9b4a78b6179335decee0365cd8c , < b2bcbeabfd843d47468fa095b1bd08ddb90cf616 (git)
Affected: 604326b41a6fb9b4a78b6179335decee0365cd8c , < 54be47e7cbb936429c3bbdfc526ea943954aaf80 (git)
Affected: 604326b41a6fb9b4a78b6179335decee0365cd8c , < ee762f684eefa59de34d9ed93cab08336e834f47 (git)
Affected: 604326b41a6fb9b4a78b6179335decee0365cd8c , < cde4d6bcd9b73073c66498f6723c7b364c4dbc18 (git)
Affected: 604326b41a6fb9b4a78b6179335decee0365cd8c , < 786d690257ec7a0c839f8710456e444ce3f1348b (git)
Affected: 604326b41a6fb9b4a78b6179335decee0365cd8c , < 752b1159ed5d0c48fe169a3721b96660a9822aa1 (git)
Affected: 604326b41a6fb9b4a78b6179335decee0365cd8c , < 2d66a033864e27ab8d5e44cb36f31d9d2413bee4 (git)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()\n\ntcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which\ndrops and reacquires the socket lock.  Its error path tries to decide\nwhether msg_tx names the local temporary message by comparing it with\nthe current value of psock-\u003ecork.\n\nThis comparison is unsafe when two threads send on the same socket:\n\n  Thread A                         Thread B\n  msg_tx = psock-\u003ecork\n  sk_msg_alloc() fails\n  sk_stream_wait_memory()\n    releases the socket lock      acquires the socket lock\n                                  completes the cork\n                                  psock-\u003ecork = NULL\n                                  frees the cork\n    reacquires the socket lock\n  msg_tx != psock-\u003ecork\n  sk_msg_free(msg_tx)\n\nThe stale cork is therefore mistaken for the local temporary message\nand freed again.  KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\n  Read of size 4 at addr ffff88810c908800 by task poc/90\n  Call Trace:\n   sk_msg_free+0x49/0x50\n   tcp_bpf_sendmsg+0x14f5/0x1cc0\n   __sys_sendto+0x32c/0x3a0\n   __x64_sys_sendto+0xdb/0x1b0\n  Allocated by task 89:\n   __kasan_kmalloc+0x8f/0xa0\n   tcp_bpf_sendmsg+0x16b3/0x1cc0\n  Freed by task 91:\n   __kasan_slab_free+0x43/0x70\n   kfree+0x131/0x3c0\n   tcp_bpf_sendmsg+0xec3/0x1cc0\n\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\ntmp directly so a changed psock-\u003ecork cannot turn a shared message into\nan apparent local one."
        }
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "lang": "en",
              "value": "AV:L - The vulnerability is triggered by local `sendmsg()`/`sendto()` syscalls issued concurrently by two threads on the same TCP socket attached to a BPF sockmap; the remote peer cannot drive the race, so this is a local attack surface.\nAC:L - The attacker controls both sides of the race: it owns both sending threads, can force the `wait_for_memory` path deterministically with a small SO_SNDBUF plus a large blocking send, and can force `sk_stream_wait_memory()` to fail via SO_SNDTIMEO or a socket error, making the stale-cork free reliably reachable.\nPR:L - Once the sockmap and sk_msg verdict/cork program are installed by the platform (a standard deployment such as Cilium/Istio sockops acceleration), an ordinary unprivileged local process owning a socket in the map triggers the bug with plain send syscalls; no capability check guards `tcp_bpf_sendmsg()` itself.\nUI:N - The attacker\u0027s own two threads perform all the required sends; no action by any other user or victim process is needed.\nS:U - The use-after-free corrupts kernel slab and page state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `sk_msg_free()` reads the freed `sk_msg` cork object (KASAN slab-use-after-free read), and by reclaiming that slab object with attacker-groomed data the freed scatterlist can be steered to leak or expose arbitrary kernel memory contents.\nI:H - Beyond the stale read, the path re-frees the cork\u0027s scatterlist pages and uncharges socket memory, giving a double-free/page-refcount-underflow primitive on an attacker-groomable slab object, which is classically leveraged into arbitrary kernel write and control-flow hijack.\nA:H - The use-after-free and duplicate page release corrupt slab and page allocator state, reliably producing a kernel oops or panic and taking the whole system down."
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        "dateUpdated": "2026-08-19T16:32:41.174Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b2bcbeabfd843d47468fa095b1bd08ddb90cf616"
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      ],
      "title": "bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()",
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    "datePublished": "2026-08-10T12:02:16.572Z",
    "dateReserved": "2026-07-30T09:28:09.379Z",
    "dateUpdated": "2026-08-19T16:32:41.174Z",
    "state": "PUBLISHED"
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Its error path tries to decide\\nwhether msg_tx names the local temporary message by comparing it with\\nthe current value of psock-\u003ecork.\\n\\nThis comparison is unsafe when two threads send on the same socket:\\n\\n  Thread A                         Thread B\\n  msg_tx = psock-\u003ecork\\n  sk_msg_alloc() fails\\n  sk_stream_wait_memory()\\n    releases the socket lock      acquires the socket lock\\n                                  completes the cork\\n                                  psock-\u003ecork = NULL\\n                                  frees the cork\\n    reacquires the socket lock\\n  msg_tx != psock-\u003ecork\\n  sk_msg_free(msg_tx)\\n\\nThe stale cork is therefore mistaken for the local temporary message\\nand freed again.  KASAN reported:\\n\\n  BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\\n  Read of size 4 at addr ffff88810c908800 by task poc/90\\n  Call Trace:\\n   sk_msg_free+0x49/0x50\\n   tcp_bpf_sendmsg+0x14f5/0x1cc0\\n   __sys_sendto+0x32c/0x3a0\\n   __x64_sys_sendto+0xdb/0x1b0\\n  Allocated by task 89:\\n   __kasan_kmalloc+0x8f/0xa0\\n   tcp_bpf_sendmsg+0x16b3/0x1cc0\\n  Freed by task 91:\\n   __kasan_slab_free+0x43/0x70\\n   kfree+0x131/0x3c0\\n   tcp_bpf_sendmsg+0xec3/0x1cc0\\n\\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\\ntmp directly so a changed psock-\u003ecork cannot turn a shared message into\\nan apparent local one.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/tcp_bpf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"0688e6fe599d2d39147ae9ece97944c6e1815ebf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"b2bcbeabfd843d47468fa095b1bd08ddb90cf616\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"54be47e7cbb936429c3bbdfc526ea943954aaf80\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"ee762f684eefa59de34d9ed93cab08336e834f47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"cde4d6bcd9b73073c66498f6723c7b364c4dbc18\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"786d690257ec7a0c839f8710456e444ce3f1348b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"752b1159ed5d0c48fe169a3721b96660a9822aa1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"604326b41a6fb9b4a78b6179335decee0365cd8c\",\"lessThan\":\"2d66a033864e27ab8d5e44cb36f31d9d2413bee4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/tcp_bpf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.20\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"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/0688e6fe599d2d39147ae9ece97944c6e1815ebf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54be47e7cbb936429c3bbdfc526ea943954aaf80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2bcbeabfd843d47468fa095b1bd08ddb90cf616\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:20:58+00:00",
      "cve": "CVE-2026-68284",
      "id": "CVE-2026-68284",
      "initial_release_date": "2026-08-10T12:02:16.572000+00:00",
      "product_status:known_affected": "233",
      "product_status:known_not_affected": "44",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: bpf/sockmap use-after-free vulnerability leading to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68284.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:37:12Z",
      "cve": "CVE-2026-68284",
      "id": "CVE-2026-68284",
      "initial_release_date": "2026-08-22T00:54:57Z",
      "product_status:first_fixed": "88",
      "product_status:known_affected": "743",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "42",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68284",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68284.json",
      "version": "7"
    }
  }
}



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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.


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.