CVE-2026-89537

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89537", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.721Z", "datePublished": "2026-09-11T19:44:15.216Z", "dateUpdated": "2026-10-30T12:32:04.586Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:04.586Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2\n\ngss_krb5_verify_mic_v2() reads the token ID at ptr[0..1], the flags\nbyte at ptr[2], and padding at ptr[3..7], then passes\nptr + GSS_KRB5_TOK_HDR_LEN and cksum_len to gss_krb5_mic_build_sg().\nNone of these accesses check read_token->len first.\n\nThe minimum safe token size is GSS_KRB5_TOK_HDR_LEN (16) plus\nctx->krb5e->cksum_len (12-24, depending on the enctype). All callers\naccept shorter tokens from the wire:\n\n - gss_unwrap_resp_integ() enforces only an upper bound\n (offset + len <= rcv_buf->len) before allocating\n mic.data = kmalloc(len) and passing it to gss_verify_mic().\n A malicious NFS server can therefore supply a short checksum\n opaque, producing a small slab allocation that the Kerberos MIC\n verifier reads past.\n\n - gss_validate() enforces only len <= RPC_MAX_AUTH_SIZE (400)\n before passing the wire-supplied length to\n gss_validate_seqno_mic(), which constructs a mic xdr_netobj\n and calls gss_verify_mic().\n\n - svcauth_gss_verify_header() enforces only\n checksum.len >= XDR_UNIT (4 bytes) before dispatching to\n gss_verify_mic().\n\n - svcauth_gss_unwrap_integ() checks only that the checksum fits\n in gsd->gsd_scratch.\n\nAdd a length guard at the top of gss_krb5_verify_mic_v2(), before any\nptr[] access or scatterlist construction. Well-formed MIC tokens from\ngss_krb5_get_mic_v2() already have exactly GSS_KRB5_TOK_HDR_LEN +\ncksum_len bytes, so valid traffic is unaffected."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - gss_krb5_verify_mic_v2() is reached from nfsd RPCSEC_GSS on TCP/2049 (svcauth_gss_accept \u2192 svcauth_gss_verify_header/unwrap_integ) and from the NFS client processing a remote server's RPCSEC_GSS verifier or krb5i checksum, so a remote peer triggers it with crafted SUNRPC traffic.\nAC:L - A single RPCSEC_GSS Call or Reply with a MIC/checksum shorter than GSS_KRB5_TOK_HDR_LEN plus cksum_len (callers accept as little as 4 bytes) deterministically over-reads; no race or attacker-uncontrollable layout is required. Kerberized NFS is a standard enterprise deployment.\nPR:N - svcauth_gss_verify_header() is the MIC check itself and runs before credentials are verified; the only gate is an rsc-cache lookup on a cleartext, monotonically increasing 64-bit GSS handle that an unauthenticated client can sniff or enumerate. A malicious NFS server needs no privileges on the client.\nUI:N - On nfsd the over-read is triggered solely by an inbound RPCSEC_GSS message; on the client it fires from the RPC receive path once an NFS/RPCSEC_GSS mount exists. No separate victim action is required at attack time.\nS:U - The slab over-read and any resulting oops stay inside the host kernel SUNRPC/GSS code. This is ordinary same-host kernel impact, not a VM escape, IOMMU bypass, or other changed-scope boundary.\nC:H - gss_unwrap_resp_integ() kmallocs only the attacker-chosen checksum length, then gss_krb5_verify_mic_v2() reads GSS_KRB5_TOK_HDR_LEN+cksum_len (28-40) bytes via gss_krb5_mic_build_sg()/sg_pcopy_to_buffer, an out-of-bounds read of adjacent slab well beyond a few bytes.\nI:N - The defect is a read-only over-read consumed as a MIC comparison; rfc3961_verify_mic copies those bytes into a local buffer and memcmp()s them. There is no out-of-bounds write, use-after-free, or control-flow hijack primitive.\nA:H - Reading 28-40 bytes past a small kmalloc object or past an RPC receive buffer near a page boundary can oops or panic on KASAN, redzone, or unmapped next-page kernels, and the attacker can repeat the crafted RPC to deny NFS service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/auth_gss/gss_krb5_unseal.c"], "versions": [{"version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "86c3d527303ec79805098bda3dfc4fa994757f59", "status": "affected", "versionType": "git"}, {"version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "b2e9e10f5a536befcdce64d3e6946dff42fb823e", "status": "affected", "versionType": "git"}, {"version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "997577c52487181226775db3755079a3ba1d52b9", "status": "affected", "versionType": "git"}, {"version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "996dd15f60121bdd7896b4554458f8806d608063", "status": "affected", "versionType": "git"}, {"version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "7a946b2e7207f968902f2147ab9b30726f82f7ab", "status": "affected", "versionType": "git"}, {"version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "b94f6719dcd9f7a609bc5f459f85795900e77d25", "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/sunrpc/auth_gss/gss_krb5_unseal.c"], "versions": [{"version": "2.6.35", "status": "affected"}, {"version": "0", "lessThan": "2.6.35", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "2.6.35", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/86c3d527303ec79805098bda3dfc4fa994757f59"}, {"url": "https://git.kernel.org/stable/c/b2e9e10f5a536befcdce64d3e6946dff42fb823e"}, {"url": "https://git.kernel.org/stable/c/997577c52487181226775db3755079a3ba1d52b9"}, {"url": "https://git.kernel.org/stable/c/996dd15f60121bdd7896b4554458f8806d608063"}, {"url": "https://git.kernel.org/stable/c/7a946b2e7207f968902f2147ab9b30726f82f7ab"}, {"url": "https://git.kernel.org/stable/c/b94f6719dcd9f7a609bc5f459f85795900e77d25"}], "title": "SUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89537", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:15.980324Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:41.729Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89537", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:15.980324Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:23:16.528Z"}}], "cna": {"title": "SUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.1, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - gss_krb5_verify_mic_v2() is reached from nfsd RPCSEC_GSS on TCP/2049 (svcauth_gss_accept \u2192 svcauth_gss_verify_header/unwrap_integ) and from the NFS client processing a remote server's RPCSEC_GSS verifier or krb5i checksum, so a remote peer triggers it with crafted SUNRPC traffic.\nAC:L - A single RPCSEC_GSS Call or Reply with a MIC/checksum shorter than GSS_KRB5_TOK_HDR_LEN plus cksum_len (callers accept as little as 4 bytes) deterministically over-reads; no race or attacker-uncontrollable layout is required. Kerberized NFS is a standard enterprise deployment.\nPR:N - svcauth_gss_verify_header() is the MIC check itself and runs before credentials are verified; the only gate is an rsc-cache lookup on a cleartext, monotonically increasing 64-bit GSS handle that an unauthenticated client can sniff or enumerate. A malicious NFS server needs no privileges on the client.\nUI:N - On nfsd the over-read is triggered solely by an inbound RPCSEC_GSS message; on the client it fires from the RPC receive path once an NFS/RPCSEC_GSS mount exists. No separate victim action is required at attack time.\nS:U - The slab over-read and any resulting oops stay inside the host kernel SUNRPC/GSS code. This is ordinary same-host kernel impact, not a VM escape, IOMMU bypass, or other changed-scope boundary.\nC:H - gss_unwrap_resp_integ() kmallocs only the attacker-chosen checksum length, then gss_krb5_verify_mic_v2() reads GSS_KRB5_TOK_HDR_LEN+cksum_len (28-40) bytes via gss_krb5_mic_build_sg()/sg_pcopy_to_buffer, an out-of-bounds read of adjacent slab well beyond a few bytes.\nI:N - The defect is a read-only over-read consumed as a MIC comparison; rfc3961_verify_mic copies those bytes into a local buffer and memcmp()s them. There is no out-of-bounds write, use-after-free, or control-flow hijack primitive.\nA:H - Reading 28-40 bytes past a small kmalloc object or past an RPC receive buffer near a page boundary can oops or panic on KASAN, redzone, or unmapped next-page kernels, and the attacker can repeat the crafted RPC to deny NFS service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "b2e9e10f5a536befcdce64d3e6946dff42fb823e", "versionType": "git"}, {"status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "997577c52487181226775db3755079a3ba1d52b9", "versionType": "git"}, {"status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "996dd15f60121bdd7896b4554458f8806d608063", "versionType": "git"}, {"status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "7a946b2e7207f968902f2147ab9b30726f82f7ab", "versionType": "git"}, {"status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "lessThan": "b94f6719dcd9f7a609bc5f459f85795900e77d25", "versionType": "git"}], "programFiles": ["net/sunrpc/auth_gss/gss_krb5_unseal.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.35"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.35", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.160", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.114", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.57", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sunrpc/auth_gss/gss_krb5_unseal.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/b2e9e10f5a536befcdce64d3e6946dff42fb823e"}, {"url": "https://git.kernel.org/stable/c/997577c52487181226775db3755079a3ba1d52b9"}, {"url": "https://git.kernel.org/stable/c/996dd15f60121bdd7896b4554458f8806d608063"}, {"url": "https://git.kernel.org/stable/c/7a946b2e7207f968902f2147ab9b30726f82f7ab"}, {"url": "https://git.kernel.org/stable/c/b94f6719dcd9f7a609bc5f459f85795900e77d25"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2\n\ngss_krb5_verify_mic_v2() reads the token ID at ptr[0..1], the flags\nbyte at ptr[2], and padding at ptr[3..7], then passes\nptr + GSS_KRB5_TOK_HDR_LEN and cksum_len to gss_krb5_mic_build_sg().\nNone of these accesses check read_token->len first.\n\nThe minimum safe token size is GSS_KRB5_TOK_HDR_LEN (16) plus\nctx->krb5e->cksum_len (12-24, depending on the enctype). All callers\naccept shorter tokens from the wire:\n\n - gss_unwrap_resp_integ() enforces only an upper bound\n (offset + len <= rcv_buf->len) before allocating\n mic.data = kmalloc(len) and passing it to gss_verify_mic().\n A malicious NFS server can therefore supply a short checksum\n opaque, producing a small slab allocation that the Kerberos MIC\n verifier reads past.\n\n - gss_validate() enforces only len <= RPC_MAX_AUTH_SIZE (400)\n before passing the wire-supplied length to\n gss_validate_seqno_mic(), which constructs a mic xdr_netobj\n and calls gss_verify_mic().\n\n - svcauth_gss_verify_header() enforces only\n checksum.len >= XDR_UNIT (4 bytes) before dispatching to\n gss_verify_mic().\n\n - svcauth_gss_unwrap_integ() checks only that the checksum fits\n in gsd->gsd_scratch.\n\nAdd a length guard at the top of gss_krb5_verify_mic_v2(), before any\nptr[] access or scatterlist construction. Well-formed MIC tokens from\ngss_krb5_get_mic_v2() already have exactly GSS_KRB5_TOK_HDR_LEN +\ncksum_len bytes, so valid traffic is unaffected."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.114", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.57", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "2.6.35"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:47:45.860Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89537", "state": "PUBLISHED", "dateUpdated": "2026-10-21T12:47:45.860Z", "dateReserved": "2026-09-11T19:38:34.721Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:44:15.216Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/auth_gss/gss_krb5_unseal.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "86c3d527303ec79805098bda3dfc4fa994757f59", "status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "versionType": "git"}, {"lessThan": "b2e9e10f5a536befcdce64d3e6946dff42fb823e", "status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "versionType": "git"}, {"lessThan": "997577c52487181226775db3755079a3ba1d52b9", "status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "versionType": "git"}, {"lessThan": "996dd15f60121bdd7896b4554458f8806d608063", "status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "versionType": "git"}, {"lessThan": "7a946b2e7207f968902f2147ab9b30726f82f7ab", "status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "versionType": "git"}, {"lessThan": "b94f6719dcd9f7a609bc5f459f85795900e77d25", "status": "affected", "version": "de9c17eb4a912c9028f7b470eb80815144883b26", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/auth_gss/gss_krb5_unseal.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.35"}, {"lessThan": "2.6.35", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nSUNRPC: Reject short RFC 4121 MIC tokens in gss_krb5_verify_mic_v2\n\ngss_krb5_verify_mic_v2() reads the token ID at ptr[0..1], the flags\nbyte at ptr[2], and padding at ptr[3..7], then passes\nptr + GSS_KRB5_TOK_HDR_LEN and cksum_len to gss_krb5_mic_build_sg().\nNone of these accesses check read_token->len first.\n\nThe minimum safe token size is GSS_KRB5_TOK_HDR_LEN (16) plus\nctx->krb5e->cksum_len (12-24, depending on the enctype). All callers\naccept shorter tokens from the wire:\n\n - gss_unwrap_resp_integ() enforces only an upper bound\n (offset + len <= rcv_buf->len) before allocating\n mic.data = kmalloc(len) and passing it to gss_verify_mic().\n A malicious NFS server can therefore supply a short checksum\n opaque, producing a small slab allocation that the Kerberos MIC\n verifier reads past.\n\n - gss_validate() enforces only len <= RPC_MAX_AUTH_SIZE (400)\n before passing the wire-supplied length to\n gss_validate_seqno_mic(), which constructs a mic xdr_netobj\n and calls gss_verify_mic().\n\n - svcauth_gss_verify_header() enforces only\n checksum.len >= XDR_UNIT (4 bytes) before dispatching to\n gss_verify_mic().\n\n - svcauth_gss_unwrap_integ() checks only that the checksum fits\n in gsd->gsd_scratch.\n\nAdd a length guard at the top of gss_krb5_verify_mic_v2(), before any\nptr[] access or scatterlist construction. Well-formed MIC tokens from\ngss_krb5_get_mic_v2() already have exactly GSS_KRB5_TOK_HDR_LEN +\ncksum_len bytes, so valid traffic is unaffected."}], "id": "CVE-2026-89537", "lastModified": "2026-10-30T13:20:19.323", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89537", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:23:15.980324Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:36.733", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a946b2e7207f968902f2147ab9b30726f82f7ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86c3d527303ec79805098bda3dfc4fa994757f59"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/996dd15f60121bdd7896b4554458f8806d608063"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/997577c52487181226775db3755079a3ba1d52b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2e9e10f5a536befcdce64d3e6946dff42fb823e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b94f6719dcd9f7a609bc5f459f85795900e77d25"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Memory corruption in SUNRPC due to short Kerberos MIC tokens", "id": "2532109", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532109"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's SUNRPC implementation, specifically within the `gss_krb5_verify_mic_v2` function. A remote malicious Network File System (NFS) server could provide a specially crafted, short Kerberos Message Integrity Code (MIC) token. This could lead to the kernel reading past an allocated memory buffer, potentially causing a denial of service or information disclosure."], "name": "CVE-2026-89537", "public_date": "2026-09-11T19:44:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89537\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89537\nhttps://git.kernel.org/stable/c/7a946b2e7207f968902f2147ab9b30726f82f7ab\nhttps://git.kernel.org/stable/c/b94f6719dcd9f7a609bc5f459f85795900e77d25"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[de9c17eb4a912c9028f7b470eb80815144883b26,7a946b2e7207f968902f2147ab9b30726f82f7ab)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[de9c17eb4a912c9028f7b470eb80815144883b26,b94f6719dcd9f7a609bc5f459f85795900e77d25)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.35"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.35)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T03:30:08.482447+00:00", "updated": "2026-09-15T22:45:07.198205+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}