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CVE-2023-53726 (GCVE-0-2023-53726)

Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2026-08-05 09:15
VLAI
Title
arm64: csum: Fix OoB access in IP checksum code for negative lengths
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: csum: Fix OoB access in IP checksum code for negative lengths Although commit c2c24edb1d9c ("arm64: csum: Fix pathological zero-length calls") added an early return for zero-length input, syzkaller has popped up with an example of a _negative_ length which causes an undefined shift and an out-of-bounds read: | BUG: KASAN: slab-out-of-bounds in do_csum+0x44/0x254 arch/arm64/lib/csum.c:39 | Read of size 4294966928 at addr ffff0000d7ac0170 by task syz-executor412/5975 | | CPU: 0 PID: 5975 Comm: syz-executor412 Not tainted 6.4.0-rc4-syzkaller-g908f31f2a05b #0 | Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 | Call trace: | dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 | show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 | __dump_stack lib/dump_stack.c:88 [inline] | dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 | print_address_description mm/kasan/report.c:351 [inline] | print_report+0x174/0x514 mm/kasan/report.c:462 | kasan_report+0xd4/0x130 mm/kasan/report.c:572 | kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187 | __kasan_check_read+0x20/0x30 mm/kasan/shadow.c:31 | do_csum+0x44/0x254 arch/arm64/lib/csum.c:39 | csum_partial+0x30/0x58 lib/checksum.c:128 | gso_make_checksum include/linux/skbuff.h:4928 [inline] | __udp_gso_segment+0xaf4/0x1bc4 net/ipv4/udp_offload.c:332 | udp6_ufo_fragment+0x540/0xca0 net/ipv6/udp_offload.c:47 | ipv6_gso_segment+0x5cc/0x1760 net/ipv6/ip6_offload.c:119 | skb_mac_gso_segment+0x2b4/0x5b0 net/core/gro.c:141 | __skb_gso_segment+0x250/0x3d0 net/core/dev.c:3401 | skb_gso_segment include/linux/netdevice.h:4859 [inline] | validate_xmit_skb+0x364/0xdbc net/core/dev.c:3659 | validate_xmit_skb_list+0x94/0x130 net/core/dev.c:3709 | sch_direct_xmit+0xe8/0x548 net/sched/sch_generic.c:327 | __dev_xmit_skb net/core/dev.c:3805 [inline] | __dev_queue_xmit+0x147c/0x3318 net/core/dev.c:4210 | dev_queue_xmit include/linux/netdevice.h:3085 [inline] | packet_xmit+0x6c/0x318 net/packet/af_packet.c:276 | packet_snd net/packet/af_packet.c:3081 [inline] | packet_sendmsg+0x376c/0x4c98 net/packet/af_packet.c:3113 | sock_sendmsg_nosec net/socket.c:724 [inline] | sock_sendmsg net/socket.c:747 [inline] | __sys_sendto+0x3b4/0x538 net/socket.c:2144 Extend the early return to reject negative lengths as well, aligning our implementation with the generic code in lib/checksum.c
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5777eaed566a1d63e344d3dd8f2b5e33be20643e , < 5a85727239a23de1cc8d93985f1056308128f3e2 (git)
Affected: 5777eaed566a1d63e344d3dd8f2b5e33be20643e , < 9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523 (git)
Affected: 5777eaed566a1d63e344d3dd8f2b5e33be20643e , < ba0b46166b8e547024d02345a68b747841931ad2 (git)
Affected: 5777eaed566a1d63e344d3dd8f2b5e33be20643e , < a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f (git)
Affected: 5777eaed566a1d63e344d3dd8f2b5e33be20643e , < fcdf904e866de0e3715835e50409fda3b2590527 (git)
Affected: 5777eaed566a1d63e344d3dd8f2b5e33be20643e , < 8bd795fedb8450ecbef18eeadbd23ed8fc7630f5 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.195 , ≤ 5.10.* (semver)
Unaffected: 5.15.132 , ≤ 5.15.* (semver)
Unaffected: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: csum: Fix OoB access in IP checksum code for negative lengths\n\nAlthough commit c2c24edb1d9c (\"arm64: csum: Fix pathological zero-length\ncalls\") added an early return for zero-length input, syzkaller has\npopped up with an example of a _negative_ length which causes an\nundefined shift and an out-of-bounds read:\n\n | BUG: KASAN: slab-out-of-bounds in do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\n | Read of size 4294966928 at addr ffff0000d7ac0170 by task syz-executor412/5975\n |\n | CPU: 0 PID: 5975 Comm: syz-executor412 Not tainted 6.4.0-rc4-syzkaller-g908f31f2a05b #0\n | Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023\n | Call trace:\n |  dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233\n |  show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240\n |  __dump_stack lib/dump_stack.c:88 [inline]\n |  dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106\n |  print_address_description mm/kasan/report.c:351 [inline]\n |  print_report+0x174/0x514 mm/kasan/report.c:462\n |  kasan_report+0xd4/0x130 mm/kasan/report.c:572\n |  kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187\n |  __kasan_check_read+0x20/0x30 mm/kasan/shadow.c:31\n |  do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\n |  csum_partial+0x30/0x58 lib/checksum.c:128\n |  gso_make_checksum include/linux/skbuff.h:4928 [inline]\n |  __udp_gso_segment+0xaf4/0x1bc4 net/ipv4/udp_offload.c:332\n |  udp6_ufo_fragment+0x540/0xca0 net/ipv6/udp_offload.c:47\n |  ipv6_gso_segment+0x5cc/0x1760 net/ipv6/ip6_offload.c:119\n |  skb_mac_gso_segment+0x2b4/0x5b0 net/core/gro.c:141\n |  __skb_gso_segment+0x250/0x3d0 net/core/dev.c:3401\n |  skb_gso_segment include/linux/netdevice.h:4859 [inline]\n |  validate_xmit_skb+0x364/0xdbc net/core/dev.c:3659\n |  validate_xmit_skb_list+0x94/0x130 net/core/dev.c:3709\n |  sch_direct_xmit+0xe8/0x548 net/sched/sch_generic.c:327\n |  __dev_xmit_skb net/core/dev.c:3805 [inline]\n |  __dev_queue_xmit+0x147c/0x3318 net/core/dev.c:4210\n |  dev_queue_xmit include/linux/netdevice.h:3085 [inline]\n |  packet_xmit+0x6c/0x318 net/packet/af_packet.c:276\n |  packet_snd net/packet/af_packet.c:3081 [inline]\n |  packet_sendmsg+0x376c/0x4c98 net/packet/af_packet.c:3113\n |  sock_sendmsg_nosec net/socket.c:724 [inline]\n |  sock_sendmsg net/socket.c:747 [inline]\n |  __sys_sendto+0x3b4/0x538 net/socket.c:2144\n\nExtend the early return to reject negative lengths as well, aligning our\nimplementation with the generic code in lib/checksum.c"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The trigger is a local `sendmsg()`/`sendto()` on an AF_PACKET socket with a crafted virtio_net_hdr, driving the local TX GSO segmentation path into `gso_make_checksum()` with a negative length. No remote peer input reaches `do_csum()` with a negative length.\nAC:L - The attacker fully controls `csum_start`, `csum_offset` and `gso_size` in the virtio_net_hdr and thus deterministically produces the negative `plen`; there is no race, no memory-layout dependency, and no reliance on unusual configuration for the underlying arm64 kernel to hit the bad path.\nPR:L - AF_PACKET socket creation checks `ns_capable(net-\u003euser_ns, CAP_NET_RAW)`, so an unprivileged user obtains it with `unshare -Urn`, which also confers CAP_NET_ADMIN in that netns to disable offloads and force software GSO segmentation.\nUI:N - The attacker triggers the whole sequence from its own process with a socket and a single send; no victim action or cooperation is involved.\nS:U - The faulty read and the undefined shift both occur within kernel context on behalf of the calling task, with no crossing of a VM, IOMMU, or other security-authority boundary.\nC:H - The fix addresses an out-of-bounds read in the checksum primitive with an attacker-influenced negative length, and the resulting checksum is emitted in the outgoing packet, exposing a function of memory outside the intended range; sufficiently negative lengths wrap `len + offset - 8` positive and let the main loop walk arbitrary kernel memory.\nI:N - `do_csum()` performs only loads; the sole downstream effect is a bogus checksum value written into the attacker\u0027s own outgoing packet, with no modification of kernel memory or other principals\u0027 data.\nA:H - The condition is reported as a KASAN slab-out-of-bounds BUG, which panics kernels built with KASAN or running `panic_on_warn`/`kasan.fault=panic`, and an unbounded negative length drives the 64-byte-stride loop off the end of the object into unmapped memory, oopsing the kernel."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:42.563Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/5a85727239a23de1cc8d93985f1056308128f3e2"
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        {
          "url": "https://git.kernel.org/stable/c/9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523"
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        {
          "url": "https://git.kernel.org/stable/c/8bd795fedb8450ecbef18eeadbd23ed8fc7630f5"
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      ],
      "title": "arm64: csum: Fix OoB access in IP checksum code for negative lengths",
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    "cveId": "CVE-2023-53726",
    "datePublished": "2025-10-22T13:23:55.896Z",
    "dateReserved": "2025-10-22T13:21:37.348Z",
    "dateUpdated": "2026-08-05T09:15:42.563Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53726",
      "date": "2026-09-14",
      "epss": "0.00139",
      "percentile": "0.0362"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53726\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-22T14:15:47.837\",\"lastModified\":\"2026-08-04T10:19:19.157\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: csum: Fix OoB access in IP checksum code for negative lengths\\n\\nAlthough commit c2c24edb1d9c (\\\"arm64: csum: Fix pathological zero-length\\ncalls\\\") added an early return for zero-length input, syzkaller has\\npopped up with an example of a _negative_ length which causes an\\nundefined shift and an out-of-bounds read:\\n\\n | BUG: KASAN: slab-out-of-bounds in do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\\n | Read of size 4294966928 at addr ffff0000d7ac0170 by task syz-executor412/5975\\n |\\n | CPU: 0 PID: 5975 Comm: syz-executor412 Not tainted 6.4.0-rc4-syzkaller-g908f31f2a05b #0\\n | Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023\\n | Call trace:\\n |  dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233\\n |  show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240\\n |  __dump_stack lib/dump_stack.c:88 [inline]\\n |  dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106\\n |  print_address_description mm/kasan/report.c:351 [inline]\\n |  print_report+0x174/0x514 mm/kasan/report.c:462\\n |  kasan_report+0xd4/0x130 mm/kasan/report.c:572\\n |  kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187\\n |  __kasan_check_read+0x20/0x30 mm/kasan/shadow.c:31\\n |  do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\\n |  csum_partial+0x30/0x58 lib/checksum.c:128\\n |  gso_make_checksum include/linux/skbuff.h:4928 [inline]\\n |  __udp_gso_segment+0xaf4/0x1bc4 net/ipv4/udp_offload.c:332\\n |  udp6_ufo_fragment+0x540/0xca0 net/ipv6/udp_offload.c:47\\n |  ipv6_gso_segment+0x5cc/0x1760 net/ipv6/ip6_offload.c:119\\n |  skb_mac_gso_segment+0x2b4/0x5b0 net/core/gro.c:141\\n |  __skb_gso_segment+0x250/0x3d0 net/core/dev.c:3401\\n |  skb_gso_segment include/linux/netdevice.h:4859 [inline]\\n |  validate_xmit_skb+0x364/0xdbc net/core/dev.c:3659\\n |  validate_xmit_skb_list+0x94/0x130 net/core/dev.c:3709\\n |  sch_direct_xmit+0xe8/0x548 net/sched/sch_generic.c:327\\n |  __dev_xmit_skb net/core/dev.c:3805 [inline]\\n |  __dev_queue_xmit+0x147c/0x3318 net/core/dev.c:4210\\n |  dev_queue_xmit include/linux/netdevice.h:3085 [inline]\\n |  packet_xmit+0x6c/0x318 net/packet/af_packet.c:276\\n |  packet_snd net/packet/af_packet.c:3081 [inline]\\n |  packet_sendmsg+0x376c/0x4c98 net/packet/af_packet.c:3113\\n |  sock_sendmsg_nosec net/socket.c:724 [inline]\\n |  sock_sendmsg net/socket.c:747 [inline]\\n |  __sys_sendto+0x3b4/0x538 net/socket.c:2144\\n\\nExtend the early return to reject negative lengths as well, aligning our\\nimplementation with the generic code in lib/checksum.c\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/arm64/lib/csum.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\"lessThan\":\"5a85727239a23de1cc8d93985f1056308128f3e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\"lessThan\":\"9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\"lessThan\":\"ba0b46166b8e547024d02345a68b747841931ad2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\"lessThan\":\"a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\"lessThan\":\"fcdf904e866de0e3715835e50409fda3b2590527\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\"lessThan\":\"8bd795fedb8450ecbef18eeadbd23ed8fc7630f5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/arm64/lib/csum.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.195\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.132\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.53\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4.16\",\"lessThanOrEqual\":\"6.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5.3\",\"lessThanOrEqual\":\"6.5.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6\",\"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:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5a85727239a23de1cc8d93985f1056308128f3e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bd795fedb8450ecbef18eeadbd23ed8fc7630f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba0b46166b8e547024d02345a68b747841931ad2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fcdf904e866de0e3715835e50409fda3b2590527\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:15:17+00:00",
      "cve": "CVE-2023-53726",
      "id": "CVE-2023-53726",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "279",
      "product_status:known_affected": "70",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: arm64: csum: Fix OoB access in IP checksum code for negative lengths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53726.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.