{"id":"CVE-2023-53432","state":"PUBLISHED","title":"firewire: net: fix use after free in fwnet_finish_incoming_packet()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirewire: net: fix use after free in fwnet_finish_incoming_packet()\n\nThe netif_rx() function frees the skb so we can't dereference it to\nsave the skb->len.","publishedAt":"2025-09-18T16:04:12.446Z","updatedAt":"2026-08-05T09:14:07.109Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927","versionType":"git"},{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"9040adc38cf6bfbb77034d558ac2c52f70d840ac","versionType":"git"},{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"9860921ab4521252dc39bb21b9c936bd09a00982","versionType":"git"},{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"3ff256751a2853e1ffaa36958ff933ccc98c6cb5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firewire/net.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"5.15.128","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.47","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.4.12","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firewire/net.c"]}],"references":["https://git.kernel.org/stable/c/2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927","https://git.kernel.org/stable/c/9040adc38cf6bfbb77034d558ac2c52f70d840ac","https://git.kernel.org/stable/c/9860921ab4521252dc39bb21b9c936bd09a00982","https://git.kernel.org/stable/c/3ff256751a2853e1ffaa36958ff933ccc98c6cb5"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53432.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53432","state":"PUBLISHED","datePublished":"2025-09-18T16:04:12.446Z","dateUpdated":"2026-08-05T09:14:07.109Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-09-17T14:54:09.745Z"},"containers":{"cna":{"title":"firewire: net: fix use after free in fwnet_finish_incoming_packet()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirewire: net: fix use after free in fwnet_finish_incoming_packet()\n\nThe netif_rx() function frees the skb so we can't dereference it to\nsave the skb->len."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927","versionType":"git"},{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"9040adc38cf6bfbb77034d558ac2c52f70d840ac","versionType":"git"},{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"9860921ab4521252dc39bb21b9c936bd09a00982","versionType":"git"},{"version":"c76acec6d55107b652a37c90b36c00bc8b04dabb","status":"affected","lessThan":"3ff256751a2853e1ffaa36958ff933ccc98c6cb5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firewire/net.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"5.15.128","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.47","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.4.12","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firewire/net.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927"},{"url":"https://git.kernel.org/stable/c/9040adc38cf6bfbb77034d558ac2c52f70d840ac"},{"url":"https://git.kernel.org/stable/c/9860921ab4521252dc39bb21b9c936bd09a00982"},{"url":"https://git.kernel.org/stable/c/3ff256751a2853e1ffaa36958ff933ccc98c6cb5"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The vulnerable path processes IP-over-1394 packets (RFC 2734/3146) from another node on the shared IEEE 1394 bus via fwnet_receive_packet/fwnet_receive_broadcast → fwnet_incoming_packet → fwnet_finish_incoming_packet, matching this CNA’s Adjacent shared-physical-segment model for FireWire (CVE-2024-50113).\nAC:L - An attacker-controlled FireWire peer can reliably send unfragmented or reassembled datagrams that reach netif_rx() on the success path; the subsequent skb->len use-after-free does not depend on conditions the attacker cannot influence, and UAF bugs are scored AC:L unless a truly uncontrollable race is required.\nPR:N - fwnet_receive_packet accepts TCODE_WRITE_BLOCK_REQUEST payloads from any bus peer with no capability check, credentials, or authentication, and fwnet_receive_broadcast likewise processes GASP packets automatically from the ISO context.\nUI:N - Packet receive and finishing run entirely in FireWire/IRQ softirq context once the firewire-net interface is up; the attacker’s own node supplies the frames and no victim user action (open/mount/click) is required.\nS:U - The use-after-free is confined to kernel sk_buff heap objects under the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free of an sk_buff after netif_rx() handoff allows the freed object to be reclaimed (e.g. via RPS on another CPU) and its contents disclosed through the dangling skb->len read, enabling arbitrary kernel memory read primitives per UAF guidance.\nI:H - sk_buff use-after-free in a general-purpose slab is a classic heap-grooming primitive that can yield attacker-controlled object reuse and control-flow hijacking, so integrity impact is High per UAF scoring guidance.\nA:H - Dereferencing a freed sk_buff can oops/panic the kernel, and an attacker on the bus can repeatedly inject packets to crash the machine at will."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T09:14:07.109Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.15.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.1.47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.4.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.5"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2023-53432","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-01-14T19:15:23.838324Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-14T19:23:09.629Z"}}]}}}