{"id":"DEBIAN-CVE-2025-40079","details":"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     [\u003cffffffff80bd5c7a\u003e] __qdisc_run+0x82/0x6f0     [\u003cffffffff80b6fe58\u003e] __dev_queue_xmit+0x4c0/0x1128     [\u003cffffffff80b80ae0\u003e] neigh_resolve_output+0xd0/0x170     [\u003cffffffff80d2daf6\u003e] ip6_finish_output2+0x226/0x6c8     [\u003cffffffff80d31254\u003e] ip6_finish_output+0x10c/0x2a0     [\u003cffffffff80d31446\u003e] ip6_output+0x5e/0x178     [\u003cffffffff80d2e232\u003e] ip6_xmit+0x29a/0x608     [\u003cffffffff80d6f4c6\u003e] inet6_csk_xmit+0xe6/0x140     [\u003cffffffff80c985e4\u003e] __tcp_transmit_skb+0x45c/0xaa8     [\u003cffffffff80c995fe\u003e] tcp_connect+0x9ce/0xd10     [\u003cffffffff80d66524\u003e] tcp_v6_connect+0x4ac/0x5e8     [\u003cffffffff80cc19b8\u003e] __inet_stream_connect+0xd8/0x318     [\u003cffffffff80cc1c36\u003e] inet_stream_connect+0x3e/0x68     [\u003cffffffff80b42b20\u003e] __sys_connect_file+0x50/0x88     [\u003cffffffff80b42bee\u003e] __sys_connect+0x96/0xc8     [\u003cffffffff80b42c40\u003e] __riscv_sys_connect+0x20/0x30     [\u003cffffffff80e5bcae\u003e] do_trap_ecall_u+0x256/0x378     [\u003cffffffff80e69af2\u003e] 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","modified":"2026-09-01T20:05:51.036462656Z","published":"2025-10-28T12:15:42.480Z","upstream":["CVE-2025-40079"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-40079"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.57-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40079.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.17.6-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.2-1~exp1","6.17.5-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40079.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}