{"id":"CVE-2026-93286","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: appletalk: fix NULL pointer dereference in aarp_send_ddp()\n\naarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast\npath without checking for NULL","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: appletalk: fix NULL pointer dereference in aarp_send_ddp()\n\naarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast\npath without checking for NULL. Wh…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 51cc5e756cec6071ffc620076aebcf5bae936668","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8c4b9ceb1be780588c1c50d573d5ee308e0874d2","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d643fd42ad96f19b5ce5cb11824fefa617191dbe","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2c","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 83899a056aeb120898a6e3a989971fc63e274e2e","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9e7f36ab5b7bf68463faa5f7b926fea8f35597bb","Linux 2.6.12"],"published":"2026-09-24","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:47.133","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93286","references":[{"url":"https://git.kernel.org/stable/c/51cc5e756cec6071ffc620076aebcf5bae936668","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/542c1dd41e1b0cd1c2c3ba8091c7d882eea0d680","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/83899a056aeb120898a6e3a989971fc63e274e2e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8c4b9ceb1be780588c1c50d573d5ee308e0874d2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8fc30f0cdf4207a5aa2341c0a98d0f1713b3ce2c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9e7f36ab5b7bf68463faa5f7b926fea8f35597bb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d643fd42ad96f19b5ce5cb11824fefa617191dbe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93286.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93286"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540516"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93286"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93286"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93286.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00173,"epssPercentile":0.06649,"ingestedAt":"2026-09-24T16:47:15.905Z","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-476"],"slug":"CVE-2026-93286","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: appletalk: fix NULL pointer dereference in aarp_send_ddp()\n\naarp_send_ddp() calls atalk_find_dev_addr(dev) in the LocalTalk fast\npath without checking for NULL. When the device has no AppleTalk\ninterface configured (dev->atalk_ptr == NULL), this leads to a NULL\npointer dereference at the at->s_net access.\n\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n RIP: 0010:aarp_send_ddp (net/appletalk/aarp.c:552 (discriminator 2))\n Call Trace:\n  <TASK>\n  atalk_sendmsg (net/appletalk/ddp.c:1715)\n  __sys_sendto (net/socket.c:2265 (discriminator 1))\n  __x64_sys_sendto (net/socket.c:2272)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nAdd a NULL check consistent with the other callers of\natalk_find_dev_addr().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93286.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224225,"id":"CVE-2026-93286","ts":1792325023377,"field":"cvss","old":null,"new":"5.5"},{"seq":224224,"id":"CVE-2026-93286","ts":1792325023377,"field":"severity","old":"none","new":"medium"}]}