CVE-2025-40079
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Sign extend struct ops return values properly The ns_bpf_qdisc selftest triggers a kernel panic: Unable to handle kernel paging request at virtual address ffffffffa38dbf58 Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000 [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000 Oops [#1] Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 [...] [last unloaded: bpf_testmod(OE)] CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G W OE 6.17.0-rc1-g2465bb83e0b4 #1 NONE Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024 epc : __qdisc_run+0x82/0x6f0 ra : __qdisc_run+0x6e/0x6f0 epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550 gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180 t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0 s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001 a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000 a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049 s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000 s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0 s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000 s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000 t5 : 0000000000000000 t6 : ff60000093a6a8b6 status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d [<ffffffff80bd5c7a>] __qdisc_run+0x82/0x6f0 [<ffffffff80b6fe58>] __dev_queue_xmit+0x4c0/0x1128 [<ffffffff80b80ae0>] neigh_resolve_output+0xd0/0x170 [<ffffffff80d2daf6>] ip6_finish_output2+0x226/0x6c8 [<ffffffff80d31254>] ip6_finish_output+0x10c/0x2a0 [<ffffffff80d31446>] ip6_output+0x5e/0x178 [<ffffffff80d2e232>] ip6_xmit+0x29a/0x608 [<ffffffff80d6f4c6>] inet6_csk_xmit+0xe6/0x140 [<ffffffff80c985e4>] __tcp_transmit_skb+0x45c/0xaa8 [<ffffffff80c995fe>] tcp_connect+0x9ce/0xd10 [<ffffffff80d66524>] tcp_v6_connect+0x4ac/0x5e8 [<ffffffff80cc19b8>] __inet_stream_connect+0xd8/0x318 [<ffffffff80cc1c36>] inet_stream_connect+0x3e/0x68 [<ffffffff80b42b20>] __sys_connect_file+0x50/0x88 [<ffffffff80b42bee>] __sys_connect+0x96/0xc8 [<ffffffff80b42c40>] __riscv_sys_connect+0x20/0x30 [<ffffffff80e5bcae>] do_trap_ecall_u+0x256/0x378 [<ffffffff80e69af2>] handle_exception+0x14a/0x156 Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709 ---[ end trace 0000000000000000 ]--- The bpf_fifo_dequeue prog returns a skb which is a pointer. The pointer is treated as a 32bit value and sign extend to 64bit in epilogue. This behavior is right for most bpf prog types but wrong for struct ops which requires RISC-V ABI. So let's sign extend struct ops return values according to the function model and RISC-V ABI([0]). [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf
View original CVE JSON
{
"id": "CVE-2025-40079",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-28T12:15:42.480",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv, bpf: Sign extend struct ops return values properly\n\nThe ns_bpf_qdisc selftest triggers a kernel panic:\n\n Unable to handle kernel paging request at virtual address ffffffffa38dbf58\n Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000\n [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000\n Oops [#1]\n Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 [...] [last unloaded: bpf_testmod(OE)]\n CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G W OE 6.17.0-rc1-g2465bb83e0b4 #1 NONE\n Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024\n epc : __qdisc_run+0x82/0x6f0\n ra : __qdisc_run+0x6e/0x6f0\n epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550\n gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180\n t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0\n s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001\n a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000\n a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049\n s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000\n s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0\n s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000\n s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000\n t5 : 0000000000000000 t6 : ff60000093a6a8b6\n status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d\n [<ffffffff80bd5c7a>] __qdisc_run+0x82/0x6f0\n [<ffffffff80b6fe58>] __dev_queue_xmit+0x4c0/0x1128\n [<ffffffff80b80ae0>] neigh_resolve_output+0xd0/0x170\n [<ffffffff80d2daf6>] ip6_finish_output2+0x226/0x6c8\n [<ffffffff80d31254>] ip6_finish_output+0x10c/0x2a0\n [<ffffffff80d31446>] ip6_output+0x5e/0x178\n [<ffffffff80d2e232>] ip6_xmit+0x29a/0x608\n [<ffffffff80d6f4c6>] inet6_csk_xmit+0xe6/0x140\n [<ffffffff80c985e4>] __tcp_transmit_skb+0x45c/0xaa8\n [<ffffffff80c995fe>] tcp_connect+0x9ce/0xd10\n [<ffffffff80d66524>] tcp_v6_connect+0x4ac/0x5e8\n [<ffffffff80cc19b8>] __inet_stream_connect+0xd8/0x318\n [<ffffffff80cc1c36>] inet_stream_connect+0x3e/0x68\n [<ffffffff80b42b20>] __sys_connect_file+0x50/0x88\n [<ffffffff80b42bee>] __sys_connect+0x96/0xc8\n [<ffffffff80b42c40>] __riscv_sys_connect+0x20/0x30\n [<ffffffff80e5bcae>] do_trap_ecall_u+0x256/0x378\n [<ffffffff80e69af2>] handle_exception+0x14a/0x156\n Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709\n ---[ end trace 0000000000000000 ]---\n\nThe bpf_fifo_dequeue prog returns a skb which is a pointer. The pointer\nis treated as a 32bit value and sign extend to 64bit in epilogue. This\nbehavior is right for most bpf prog types but wrong for struct ops which\nrequires RISC-V ABI.\n\nSo let's sign extend struct ops return values according to the function\nmodel and RISC-V ABI([0]).\n\n [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nriscv, bpf: Extender el signo de los valores de retorno de operaciones de estructura correctamente\n\nLa autoprueba ns_bpf_qdisc desencadena un pánico del kernel:\n\n Unable to handle kernel paging request at virtual address ffffffffa38dbf58\n Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000\n [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000\n Oops [#1]\n Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 [...] [last unloaded: bpf_testmod(OE)]\n CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G W OE 6.17.0-rc1-g2465bb83e0b4 #1 NONE\n Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024\n epc : __qdisc_run+0x82/0x6f0\n ra : __qdisc_run+0x6e/0x6f0\n epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550\n gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180\n t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0\n s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001\n a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000\n a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049\n s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000\n s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0\n s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000\n s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000\n t5 : 0000000000000000 t6 : ff60000093a6a8b6\n status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d\n [<ffffffff80bd5c7a>] __qdisc_run+0x82/0x6f0\n [<ffffffff80b6fe58>] __dev_queue_xmit+0x4c0/0x1128\n [<ffffffff80b80ae0>] neigh_resolve_output+0xd0/0x170\n [<ffffffff80d2daf6>] ip6_finish_output2+0x226/0x6c8\n [<ffffffff80d31254>] ip6_finish_output+0x10c/0x2a0\n [<ffffffff80d31446>] ip6_output+0x5e/0x178\n [<ffffffff80d2e232>] ip6_xmit+0x29a/0x608\n [<ffffffff80d6f4c6>] inet6_csk_xmit+0xe6/0x140\n [<ffffffff80c985e4>] __tcp_transmit_skb+0x45c/0xaa8\n [<ffffffff80c995fe>] tcp_connect+0x9ce/0xd10\n [<ffffffff80d66524>] tcp_v6_connect+0x4ac/0x5e8\n [<ffffffff80cc19b8>] __inet_stream_connect+0xd8/0x318\n [<ffffffff80cc1c36>] inet_stream_connect+0x3e/0x68\n [<ffffffff80b42b20>] __sys_connect_file+0x50/0x88\n [<ffffffff80b42bee>] __sys_connect+0x96/0xc8\n [<ffffffff80b42c40>] __riscv_sys_connect+0x20/0x30\n [<ffffffff80e5bcae>] do_trap_ecall_u+0x256/0x378\n [<ffffffff80e69af2>] handle_exception+0x14a/0x156\n Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709\n ---[ end trace 0000000000000000 ]---\n\nEl programa bpf_fifo_dequeue devuelve un skb que es un puntero. El puntero es tratado como un valor de 32 bits y se extiende el signo a 64 bits en el epílogo. Este comportamiento es correcto para la mayoría de los tipos de programas bpf, pero incorrecto para las operaciones de estructura que requieren la ABI de RISC-V.\n\nAsí que extendamos el signo de los valores de retorno de las operaciones de estructura de acuerdo con el modelo de función y la ABI de RISC-V ([0]).\n\n [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"arch/riscv/net/bpf_jit_comp64.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "25ad10658dc1068a671553ff10e19a812c2a3783",
"lessThan": "92751937f12a7d34ad492577a251c94a55e97e72",
"versionType": "git",
"status": "affected"
},
{
"version": "25ad10658dc1068a671553ff10e19a812c2a3783",
"lessThan": "918a399501e28e0cc36dbd1fcfb4208f8aa1e4d1",
"versionType": "git",
"status": "affected"
},
{
"version": "25ad10658dc1068a671553ff10e19a812c2a3783",
"lessThan": "fd2e08128944a7679e753f920e9eda72057e427c",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"arch/riscv/net/bpf_jit_comp64.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.6",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.53",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.3",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/918a399501e28e0cc36dbd1fcfb4208f8aa1e4d1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/92751937f12a7d34ad492577a251c94a55e97e72",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fd2e08128944a7679e753f920e9eda72057e427c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}