{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53338","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-09-16T16:08:59.565Z","datePublished":"2025-09-17T14:56:32.302Z","dateUpdated":"2026-05-11T19:43:00.924Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:43:00.924Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nlwt: Fix return values of BPF xmit ops\n\nBPF encap ops can return different types of positive values, such like\nNET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function\nskb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return\nvalues would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in\nip(6)_finish_output2. When this happens, skbs that have been freed would\ncontinue to the neighbor subsystem, causing use-after-free bug and\nkernel crashes.\n\nTo fix the incorrect behavior, skb_do_redirect return values can be\nsimply discarded, the same as tc-egress behavior. On the other hand,\nbpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU\ninformation. Thus convert its return values to avoid the conflict with\nLWTUNNEL_XMIT_CONTINUE."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/lwt_bpf.c"],"versions":[{"version":"3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2","lessThan":"67f8f2bae8e7ac72e09def2b667e44704c4d1ee1","status":"affected","versionType":"git"},{"version":"3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2","lessThan":"a97f221651fcdc891166e9bc270e3d9bfa5a0080","status":"affected","versionType":"git"},{"version":"3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2","lessThan":"e3f647e4b642f9f6d32795a16f92c116c138d2af","status":"affected","versionType":"git"},{"version":"3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2","lessThan":"065d5f17096ec9161180e2c890afdff4dc6125f2","status":"affected","versionType":"git"},{"version":"3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2","lessThan":"d68c17402442f5f494a2c3ebde5cb82f6aa9160a","status":"affected","versionType":"git"},{"version":"3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2","lessThan":"65583f9e070db7bece20710cfa2e3daeb0b831d9","status":"affected","versionType":"git"},{"version":"3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2","lessThan":"29b22badb7a84b783e3a4fffca16f7768fb31205","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/lwt_bpf.c"],"versions":[{"version":"4.10","status":"affected"},{"version":"0","lessThan":"4.10","status":"unaffected","versionType":"semver"},{"version":"5.4.257","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.195","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.132","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.53","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.4.16","lessThanOrEqual":"6.4.*","status":"unaffected","versionType":"semver"},{"version":"6.5.3","lessThanOrEqual":"6.5.*","status":"unaffected","versionType":"semver"},{"version":"6.6","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.4.257"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.10.195"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.15.132"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.1.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.4.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.5.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.6"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/67f8f2bae8e7ac72e09def2b667e44704c4d1ee1"},{"url":"https://git.kernel.org/stable/c/a97f221651fcdc891166e9bc270e3d9bfa5a0080"},{"url":"https://git.kernel.org/stable/c/e3f647e4b642f9f6d32795a16f92c116c138d2af"},{"url":"https://git.kernel.org/stable/c/065d5f17096ec9161180e2c890afdff4dc6125f2"},{"url":"https://git.kernel.org/stable/c/d68c17402442f5f494a2c3ebde5cb82f6aa9160a"},{"url":"https://git.kernel.org/stable/c/65583f9e070db7bece20710cfa2e3daeb0b831d9"},{"url":"https://git.kernel.org/stable/c/29b22badb7a84b783e3a4fffca16f7768fb31205"}],"title":"lwt: Fix return values of BPF xmit ops","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"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-2023-53338","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-01-14T18:38:11.999922Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-416","description":"CWE-416 Use After Free"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-01-14T18:43:01.329Z"}}]}}