Answer in brief
CVE-2024-26640 records a Unknown severity vulnerability in tcp: add sanity checks to rx zerocopy. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=93ab6cc69162775201587cc9da00d5016dc890e2 <f48bf9a83b1666d934247cb58a9887d7b3127b6f || >=93ab6cc69162775201587cc9da00d5016dc890e2 <718f446e60316bf606946f7f42367d691d21541e || >=93ab6cc69162775201587cc9da00d5016dc890e2 <b383d4ea272fe5795877506dcce5aad1f6330e5e || >=93ab6cc69162775201587cc9da00d5016dc890e2 <d15cc0f66884ef2bed28c7ccbb11c102aa3a0760 || >=93ab6cc69162775201587cc9da00d5016dc890e2 <1b8adcc0e2c584fec778add7777fe28e20781e60 || >=93ab6cc69162775201587cc9da00d5016dc890e2 <577e4432f3ac810049cb7e6b71f4d96ec7c6e894 | f48bf9a83b1666d934247cb58a9887d7b3127b6f, 718f446e60316bf606946f7f42367d691d21541e, b383d4ea272fe5795877506dcce5aad1f6330e5e, d15cc0f66884ef2bed28c7ccbb11c102aa3a0760, 1b8adcc0e2c584fec778add7777fe28e20781e60, 577e4432f3ac810049cb7e6b71f4d96ec7c6e894 |
| Linux/Linuxgeneric | 4.18 | Not reported |
Published upstream
Mar 18, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: tcp: add sanity checks to rx zerocopy TCP rx zerocopy intent is to map pages initially allocated from NIC drivers, not pages owned by a fs. This patch adds to can_map_frag() these additional checks: - Page must not be a compound one. - page->mapping must be NULL. This fixes the panic reported by ZhangPeng. syzbot was able to loopback packets built with sendfile(), mapping pages owned by an ext4 file to TCP rx zerocopy. r3 = socket$inet_tcp(0x2, 0x1, 0x0) mmap(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x12, r3, 0x0) r4 = socket$inet_tcp(0x2, 0x1, 0x0) bind$inet(r4, &(0x7f0000000000)={0x2, 0x4e24, @multicast1}, 0x10) connect$inet(r4, &(0x7f00000006c0)={0x2, 0x4e24, @empty}, 0x10) r5 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0) fallocate(r5, 0x0, 0x0, 0x85b8) sendfile(r4, r5, 0x0, 0x8ba0) getsockopt$inet_tcp_TCP_ZEROCOPY_RECEIVE(r4, 0x6, 0x23, &(0x7f00000001c0)={&(0x7f0000ffb000/0x3000)=nil, 0x3000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, &(0x7f0000000440)=0x40) r6 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0)
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2024-26640 records a Unknown severity vulnerability in tcp: add sanity checks to rx zerocopy. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=93ab6cc69162775201587cc9da00d5016dc890e2 <f48bf9a83b1666d934247cb58a9887d7b3127b6f || >=93ab6cc69162775201587cc9da00d5016dc890e2 <718f446e60316bf606946f7f42367d691d21541e || >=93ab6cc69162775201587cc9da00d5016dc890e2 <b383d4ea272fe5795877506dcce5aad1f6330e5e || >=93ab6cc69162775201587cc9da00d5016dc890e2 <d15cc0f66884ef2bed28c7ccbb11c102aa3a0760 || >=93ab6cc69162775201587cc9da00d5016dc890e2 <1b8adcc0e2c584fec778add7777fe28e20781e60 || >=93ab6cc69162775201587cc9da00d5016dc890e2 <577e4432f3ac810049cb7e6b71f4d96ec7c6e894 | f48bf9a83b1666d934247cb58a9887d7b3127b6f, 718f446e60316bf606946f7f42367d691d21541e, b383d4ea272fe5795877506dcce5aad1f6330e5e, d15cc0f66884ef2bed28c7ccbb11c102aa3a0760, 1b8adcc0e2c584fec778add7777fe28e20781e60, 577e4432f3ac810049cb7e6b71f4d96ec7c6e894 |
| Linux/Linuxgeneric | 4.18 | Not reported |
Published upstream
Mar 18, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: tcp: add sanity checks to rx zerocopy TCP rx zerocopy intent is to map pages initially allocated from NIC drivers, not pages owned by a fs. This patch adds to can_map_frag() these additional checks: - Page must not be a compound one. - page->mapping must be NULL. This fixes the panic reported by ZhangPeng. syzbot was able to loopback packets built with sendfile(), mapping pages owned by an ext4 file to TCP rx zerocopy. r3 = socket$inet_tcp(0x2, 0x1, 0x0) mmap(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x12, r3, 0x0) r4 = socket$inet_tcp(0x2, 0x1, 0x0) bind$inet(r4, &(0x7f0000000000)={0x2, 0x4e24, @multicast1}, 0x10) connect$inet(r4, &(0x7f00000006c0)={0x2, 0x4e24, @empty}, 0x10) r5 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0) fallocate(r5, 0x0, 0x0, 0x85b8) sendfile(r4, r5, 0x0, 0x8ba0) getsockopt$inet_tcp_TCP_ZEROCOPY_RECEIVE(r4, 0x6, 0x23, &(0x7f00000001c0)={&(0x7f0000ffb000/0x3000)=nil, 0x3000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, &(0x7f0000000440)=0x40) r6 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0)
Quoted source text, attributed separately from HOL analysis.