CVE-2024-26640
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.
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
Description
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)
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS 0.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://git.kernel.org/stable/c/1b8adcc0e2c584fec778add7777fe28e20781e60Mailing List, Patch
- https://git.kernel.org/stable/c/577e4432f3ac810049cb7e6b71f4d96ec7c6e894Mailing List, Patch
- https://git.kernel.org/stable/c/718f446e60316bf606946f7f42367d691d21541eMailing List, Patch
- https://git.kernel.org/stable/c/b383d4ea272fe5795877506dcce5aad1f6330e5eMailing List, Patch
- https://git.kernel.org/stable/c/d15cc0f66884ef2bed28c7ccbb11c102aa3a0760Mailing List, Patch
- https://git.kernel.org/stable/c/f48bf9a83b1666d934247cb58a9887d7b3127b6fMailing List, Patch
- https://git.kernel.org/stable/c/1b8adcc0e2c584fec778add7777fe28e20781e60Mailing List, Patch
- https://git.kernel.org/stable/c/577e4432f3ac810049cb7e6b71f4d96ec7c6e894Mailing List, Patch
- https://git.kernel.org/stable/c/718f446e60316bf606946f7f42367d691d21541eMailing List, Patch
- https://git.kernel.org/stable/c/b383d4ea272fe5795877506dcce5aad1f6330e5eMailing List, Patch
- https://git.kernel.org/stable/c/d15cc0f66884ef2bed28c7ccbb11c102aa3a0760Mailing List, Patch
- https://git.kernel.org/stable/c/f48bf9a83b1666d934247cb58a9887d7b3127b6fMailing List, Patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.