{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80848", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.797Z", "datePublished": "2026-09-04T15:54:58.427Z", "dateUpdated": "2026-09-04T15:54:58.427Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T15:54:58.427Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: espintcp: fix UAF during close\n\nZDI reported and analyzed a race condition during close for espintcp\nsockets:\n\n espintcp_close() frees emsg->skb via kfree_skb() without holding\n any socket lock. Concurrently, the xfrm_trans_reinject work queue\n invokes esp_output_tcp_finish() -> espintcp_push_skb() ->\n espintcp_push_msgs() -> skb_send_sock_locked(), which reads the\n same skb as a data source.\n\nFix this by adding a synchronize_rcu() call after resetting sk_prot,\nsince esp_output_tcp_finish() runs under RCU and won't use a socket\nwith sk_prot == &tcp_prot. Simply taking the socket lock in\nespintcp_close() could lead to leaks, if esp_output_tcp_finish()\nre-adds an skb in the slot we just freed. After this, the existing\nbarrier() is no longer needed."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/espintcp.c"], "versions": [{"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "29121c5e6591da527e8e36ddac7120dc527f574d", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "ed5d9102190c45fc70121c036b0626b740040b75", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "4bc0dfa28dca6fc0084203732695968049c44072", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "ff8dd7a932f34409a56e1b91a1219340f17457e9", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "4b31a875693c480c611519faca46216514e3e052", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "24efebecf415ba264adba0f0491cec436463a14f", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "eb3bbf29c723fe75c0eb92be14f0ec92971fe272", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "54b41ad14da9a981131ab6e4d3f79321a503ea5d", "status": "affected", "versionType": "git"}, {"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "lessThan": "deb232e884877bf10b4ce2580909eedec986c284", "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/xfrm/espintcp.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.187", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.156", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.108", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.49", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.13", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.3", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "5.6", "versionEndExcluding": "5.10.269"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.220"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.187"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.156"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.108"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.49"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.1.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/29121c5e6591da527e8e36ddac7120dc527f574d"}, {"url": "https://git.kernel.org/stable/c/ed5d9102190c45fc70121c036b0626b740040b75"}, {"url": "https://git.kernel.org/stable/c/4bc0dfa28dca6fc0084203732695968049c44072"}, {"url": "https://git.kernel.org/stable/c/ff8dd7a932f34409a56e1b91a1219340f17457e9"}, {"url": "https://git.kernel.org/stable/c/4b31a875693c480c611519faca46216514e3e052"}, {"url": "https://git.kernel.org/stable/c/24efebecf415ba264adba0f0491cec436463a14f"}, {"url": "https://git.kernel.org/stable/c/eb3bbf29c723fe75c0eb92be14f0ec92971fe272"}, {"url": "https://git.kernel.org/stable/c/54b41ad14da9a981131ab6e4d3f79321a503ea5d"}, {"url": "https://git.kernel.org/stable/c/deb232e884877bf10b4ce2580909eedec986c284"}], "title": "xfrm: espintcp: fix UAF during close", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/xfrm/espintcp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "29121c5e6591da527e8e36ddac7120dc527f574d", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "ed5d9102190c45fc70121c036b0626b740040b75", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "4bc0dfa28dca6fc0084203732695968049c44072", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "ff8dd7a932f34409a56e1b91a1219340f17457e9", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "4b31a875693c480c611519faca46216514e3e052", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "24efebecf415ba264adba0f0491cec436463a14f", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "eb3bbf29c723fe75c0eb92be14f0ec92971fe272", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "54b41ad14da9a981131ab6e4d3f79321a503ea5d", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}, {"lessThan": "deb232e884877bf10b4ce2580909eedec986c284", "status": "affected", "version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/xfrm/espintcp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"lessThan": "5.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.269", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.220", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.187", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.156", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.108", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.49", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.13", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: espintcp: fix UAF during close\n\nZDI reported and analyzed a race condition during close for espintcp\nsockets:\n\n espintcp_close() frees emsg->skb via kfree_skb() without holding\n any socket lock. Concurrently, the xfrm_trans_reinject work queue\n invokes esp_output_tcp_finish() -> espintcp_push_skb() ->\n espintcp_push_msgs() -> skb_send_sock_locked(), which reads the\n same skb as a data source.\n\nFix this by adding a synchronize_rcu() call after resetting sk_prot,\nsince esp_output_tcp_finish() runs under RCU and won't use a socket\nwith sk_prot == &tcp_prot. Simply taking the socket lock in\nespintcp_close() could lead to leaks, if esp_output_tcp_finish()\nre-adds an skb in the slot we just freed. After this, the existing\nbarrier() is no longer needed."}], "id": "CVE-2026-80848", "lastModified": "2026-09-04T16:18:13.540", "metrics": {}, "published": "2026-09-04T16:18:13.540", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/24efebecf415ba264adba0f0491cec436463a14f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/29121c5e6591da527e8e36ddac7120dc527f574d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b31a875693c480c611519faca46216514e3e052"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4bc0dfa28dca6fc0084203732695968049c44072"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/54b41ad14da9a981131ab6e4d3f79321a503ea5d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/deb232e884877bf10b4ce2580909eedec986c284"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eb3bbf29c723fe75c0eb92be14f0ec92971fe272"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ed5d9102190c45fc70121c036b0626b740040b75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ff8dd7a932f34409a56e1b91a1219340f17457e9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}