CVE-2026-68284 (GCVE-0-2026-68284)
Vulnerability from cvelistv5
Published
2026-08-10 12:02
Modified
2026-10-19 20:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
Version: 604326b41a6fb9b4a78b6179335decee0365cd8c
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          "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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              "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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    "cveId": "CVE-2026-68284",
    "datePublished": "2026-08-10T12:02:16.572Z",
    "dateReserved": "2026-07-30T09:28:09.379Z",
    "dateUpdated": "2026-10-19T20:58:59.373Z",
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"programFiles\": [\"net/ipv4/tcp_bpf.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/tcp_bpf.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/0688e6fe599d2d39147ae9ece97944c6e1815ebf\"}, {\"url\": \"https://git.kernel.org/stable/c/b2bcbeabfd843d47468fa095b1bd08ddb90cf616\"}, {\"url\": \"https://git.kernel.org/stable/c/54be47e7cbb936429c3bbdfc526ea943954aaf80\"}, {\"url\": \"https://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47\"}, {\"url\": \"https://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18\"}, {\"url\": \"https://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b\"}, {\"url\": \"https://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1\"}, {\"url\": \"https://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:32:41.174Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68284\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:59.373Z\", \"dateReserved\": \"2026-07-30T09:28:09.379Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T12:02:16.572Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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